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GridGroupingControl: Delete row

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16073 Jul 6,2004 02:17 AM Feb 6,2006 09:59 PM Windows Forms 5
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Tags: GridControl
Administrator [Syncfusion]
Asked On July 6, 2004 02:17 AM

Hello. How to implement "Delete" button not only for top-level table row, but for child rows too. Thanks. Current code: private void button2_Click(object sender, System.EventArgs e) { Record r = this.gridGroupingControl1.Table.CurrentRecord; if(r != null) { r.Delete(); } }

Satish
Replied On July 6, 2004 02:22 AM

Here is the code... using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using Syncfusion.Windows.Forms.Grid; namespace UpdateableExpandGrid { /// /// Summary description for Form1. /// public class Form1 : System.Windows.Forms.Form { private GridDataBoundGrid gridDataBoundGrid1; private System.Windows.Forms.Button buttonExpandAll; private System.Windows.Forms.Button buttonCollapseAll; private System.Windows.Forms.Button buttonChangeValue; private System.Windows.Forms.Button buttonDeleteRow; private System.Windows.Forms.Button buttonInsertRow; /// /// Required designer variable. /// private System.ComponentModel.Container components = null; public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// /// Clean up any resources being used. /// protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form Designer generated code /// /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// private void InitializeComponent() { this.gridDataBoundGrid1 = new Syncfusion.Windows.Forms.Grid.GridDataBoundGrid(); this.buttonExpandAll = new System.Windows.Forms.Button(); this.buttonCollapseAll = new System.Windows.Forms.Button(); this.buttonChangeValue = new System.Windows.Forms.Button(); this.buttonDeleteRow = new System.Windows.Forms.Button(); this.buttonInsertRow = new System.Windows.Forms.Button(); ((System.ComponentModel.ISupportInitialize)(this.gridDataBoundGrid1)).BeginInit(); this.SuspendLayout(); // // gridDataBoundGrid1 // this.gridDataBoundGrid1.AllowDragSelectedCols = true; this.gridDataBoundGrid1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) | System.Windows.Forms.AnchorStyles.Left) | System.Windows.Forms.AnchorStyles.Right); this.gridDataBoundGrid1.Location = new System.Drawing.Point(16, 56); this.gridDataBoundGrid1.Name = "gridDataBoundGrid1"; this.gridDataBoundGrid1.ShowCurrentCellBorderBehavior = Syncfusion.Windows.Forms.Grid.GridShowCurrentCellBorder.GrayWhenLostFocus; this.gridDataBoundGrid1.Size = new System.Drawing.Size(520, 288); this.gridDataBoundGrid1.SortBehavior = Syncfusion.Windows.Forms.Grid.GridSortBehavior.DoubleClick; this.gridDataBoundGrid1.TabIndex = 0; this.gridDataBoundGrid1.Text = "gridDataBoundGrid1"; // // buttonExpandAll // this.buttonExpandAll.Location = new System.Drawing.Point(16, 16); this.buttonExpandAll.Name = "buttonExpandAll"; this.buttonExpandAll.TabIndex = 1; this.buttonExpandAll.Text = "ExpandAll"; this.buttonExpandAll.Click += new System.EventHandler(this.buttonExpandAll_Click); // // buttonCollapseAll // this.buttonCollapseAll.Location = new System.Drawing.Point(88, 16); this.buttonCollapseAll.Name = "buttonCollapseAll"; this.buttonCollapseAll.TabIndex = 2; this.buttonCollapseAll.Text = "CollapseAll"; this.buttonCollapseAll.Click += new System.EventHandler(this.buttonCollapseAll_Click); // // buttonChangeValue // this.buttonChangeValue.Location = new System.Drawing.Point(160, 16); this.buttonChangeValue.Name = "buttonChangeValue"; this.buttonChangeValue.Size = new System.Drawing.Size(152, 23); this.buttonChangeValue.TabIndex = 3; this.buttonChangeValue.Text = "ChangeValueInCurrentRow"; this.buttonChangeValue.Click += new System.EventHandler(this.buttonChangeValue_Click); // // buttonDeleteRow // this.buttonDeleteRow.Location = new System.Drawing.Point(312, 16); this.buttonDeleteRow.Name = "buttonDeleteRow"; this.buttonDeleteRow.Size = new System.Drawing.Size(112, 23); this.buttonDeleteRow.TabIndex = 4; this.buttonDeleteRow.Text = "DeleteCurrentRow"; this.buttonDeleteRow.Click += new System.EventHandler(this.buttonDeleteRow_Click); // // buttonInsertRow // this.buttonInsertRow.Location = new System.Drawing.Point(424, 16); this.buttonInsertRow.Name = "buttonInsertRow"; this.buttonInsertRow.Size = new System.Drawing.Size(112, 23); this.buttonInsertRow.TabIndex = 5; this.buttonInsertRow.Text = "InsertAtCurrentRow"; this.buttonInsertRow.Click += new System.EventHandler(this.buttonInsertRow_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(552, 358); this.Controls.AddRange(new System.Windows.Forms.Control[] { this.buttonInsertRow, this.buttonDeleteRow, this.buttonChangeValue, this.buttonCollapseAll, this.buttonExpandAll, this.gridDataBoundGrid1}); this.Name = "Form1"; this.Text = "Form1"; this.Load += new System.EventHandler(this.Form1_Load); ((System.ComponentModel.ISupportInitialize)(this.gridDataBoundGrid1)).EndInit(); this.ResumeLayout(false); } #endregion /// /// The main entry point for the application. /// [STAThread] static void Main() { Application.Run(new Form1()); } private DataSet dSet; GridHierarchyLevel hlParentToChild; GridHierarchyLevel hlChildToGrandChild; GridHierarchyLevel hlParent; private void Form1_Load(object sender, System.EventArgs e) { //dataset ============================================== dSet = new DataSet(); DataTable parentTable = GetParentTable(); DataTable childTable = GetChildTable(); DataTable grandChildTable = GetGrandChildTable(); dSet.Tables.AddRange(new DataTable[]{parentTable, childTable, grandChildTable}); //setup the relations ======================================== DataColumn parentColumn = parentTable.Columns["parentID"]; DataColumn childColumn = childTable.Columns["ParentID"]; dSet.Relations.Add("ParentToChild", parentColumn, childColumn); parentColumn = childTable.Columns["childID"]; childColumn = grandChildTable.Columns["ChildID"]; dSet.Relations.Add("ChildToGrandChild", parentColumn, childColumn); //expand grid =================================================== this.gridDataBoundGrid1.DataSource = parentTable; hlParentToChild = this.gridDataBoundGrid1.Binder.AddRelation("ParentToChild"); hlChildToGrandChild = this.gridDataBoundGrid1.Binder.AddRelation("ChildToGrandChild"); hlParent = this.gridDataBoundGrid1.Binder.RootHierarchyLevel; //hlParentToChild.ShowHeaders = false; //hlChildToGrandChild.ShowHeaders = false; //hlParent.ShowHeaders = false; //setup the parentgridlayout hlParent.LayoutColumns(new string[]{"parentID", "ParentName", " ", " "}); this.gridDataBoundGrid1.Model.CoveredRanges.Add(GridRangeInfo.Cells(0, 4, 0, 5)); //gray the last 2 columns GridStyleInfo style = hlParent.InternalColumns[2].StyleInfo; style.Borders.All = new GridBorder(GridBorderStyle.None); style.BackColor = SystemColors.Control; style.CellType = "Static"; style.Enabled = false; style = hlParent.InternalColumns[3].StyleInfo; style.Borders.All = new GridBorder(GridBorderStyle.None); style.BackColor = SystemColors.Control; style.CellType = "Static"; style.Enabled = false; hlParent.RowStyle.BackColor = Color.PaleGoldenrod; //setup the child gridlayout hlParentToChild.LayoutColumns(new string[]{"childID", "Name", "ParentID", " "}); //gray the last column style = hlParentToChild.InternalColumns[3].StyleInfo; style.Borders.All = new GridBorder(GridBorderStyle.None); style.BackColor = SystemColors.Control; style.CellType = "Static"; style.Enabled = false; hlParentToChild.RowStyle.BackColor = Color.LightGoldenrodYellow; this.gridDataBoundGrid1.AllowResizeToFit = false; this.gridDataBoundGrid1.Model.ColWidths.ResizeToFit(GridRangeInfo.Rows(0, 2), GridResizeToFitOptions.IncludeHeaders); this.gridDataBoundGrid1.Model.ColWidths[1] = 20; this.gridDataBoundGrid1.Model.ColWidths[3] = 120; //handle Row expanding/collapse to hook bindlinglist.ListChanged event // for the child tables this.gridDataBoundGrid1.RowCollapsing += new GridRowEventHandler(grid_RowCollapsing); this.gridDataBoundGrid1.RowExpanded += new GridRowEventHandler(grid_RowExpanded); //handle to listen to teh changed event for the parent table CurrencyManager cm = (CurrencyManager)this.BindingContext[this.gridDataBoundGrid1.DataSource, this.gridDataBoundGrid1.DataMember]; ((IBindingList)cm.List).ListChanged += new ListChangedEventHandler(list_ListChanged); } #region Dynamically hooking and unhooking ListChanged event //ParentNodesOfExpandedNodes holds a list of parent nodes: key - parent nodes value- arraylist of ChildLists // used when a parent node is close so all children listchanged event handlers can be unhooked private Hashtable ParentNodesOfExpandedNodes = new Hashtable(); //hook the ListChange event for the node that opened //and save its parent node in the ParentNodesOfExpandedNodes hashtable private void grid_RowExpanded(object sender, GridRowEventArgs e) { GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(e.RowIndex); if(state.ChildList != null) { ((IBindingList)state.ChildList).ListChanged += new ListChangedEventHandler(list_ListChanged); Console.WriteLine(" HOOKED " + e.RowIndex.ToString()); if(state.Parent != null) { SaveParentNode(state); } } } //help method that save the parent node of an expanded child // so, later if you close teh paerent, the child''s listchanged event can also be unhooked private void SaveParentNode(GridBoundRecordState state) { if(ParentNodesOfExpandedNodes.ContainsKey(state.Parent)) { ArrayList al = (ArrayList)ParentNodesOfExpandedNodes[state.Parent]; al.Add(state.ChildList); } else { ArrayList al = new ArrayList(); al.Add(state.ChildList); ParentNodesOfExpandedNodes.Add(state.Parent, al); } } //here we unhook the ListChnaged event for teh node this closing //as well as any child ListChanged event that is hooked private void grid_RowCollapsing(object sender, GridRowEventArgs e) { ResetNodeAndChildNodesAtRow(e.RowIndex); } //helper method that unhooks teh ListChanged event of teh row plus as well // as the listchanged events of any children node. Uses the ParentNodesOfExpandedNodes hahtable // to get at the children private void ResetNodeAndChildNodesAtRow(int row) { GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); if(state.ChildList != null) { ((IBindingList)state.ChildList).ListChanged -= new ListChangedEventHandler(list_ListChanged); Console.WriteLine("UNHOOKED " + row.ToString()); } if(ParentNodesOfExpandedNodes.ContainsKey(state)) { ArrayList al = (ArrayList)ParentNodesOfExpandedNodes[state]; foreach(IBindingList list in al) { list.ListChanged -= new ListChangedEventHandler(list_ListChanged); Console.WriteLine("UNHOOKEDc " + row.ToString()); } ParentNodesOfExpandedNodes.Remove(state); } } #endregion #region ListChanged event handler that reacts to child changes private void list_ListChanged(object sender, ListChangedEventArgs e) { IBindingList list = (IBindingList) sender; if(list != null) { //find the parent row... int parentRow = findParentRowFromChildList(list); if(parentRow == -1) { //we have a parent row. Check for change. if(e.ListChangedType == ListChangedType.ItemChanged) { UpdateThisParentRow(e.NewIndex); } else if(e.ListChangedType == ListChangedType.ItemAdded || e.ListChangedType == ListChangedType.ItemDeleted) { UpdateThisParentRow(e.NewIndex); this.gridDataBoundGrid1.Refresh(); } return; } //recurs = 0; int screenRow = parentRow + e.NewIndex + 1;// - this.gridDataBoundGrid1.TopRowIndex - 1; for(int j = 1; j <= e.NewIndex; ++j) screenRow += ScreenRowsInChildren(parentRow + j); Console.WriteLine("Item#=" + e.NewIndex.ToString() + " parentRow: " + parentRow.ToString() + " screenRow: " + screenRow.ToString()); switch(e.ListChangedType) { case ListChangedType.ItemChanged: //just redraw screen row to show the change this.gridDataBoundGrid1.RefreshRange(GridRangeInfo.Row(screenRow)); Console.WriteLine("ItemChanged"); break; case ListChangedType.ItemAdded: //this opens & closes the parent node RefreshRow(parentRow); //put the currentcell somewhere this.gridDataBoundGrid1.Focus(); this.gridDataBoundGrid1.CurrentCell.Activate(screenRow - 1, 2); //minus 1 because of new row Console.WriteLine("ItemAdded"); break; case ListChangedType.ItemDeleted: //this opens & closes the parent node RefreshRow(parentRow); //put the currentcell somewhere this.gridDataBoundGrid1.Focus(); this.gridDataBoundGrid1.CurrentCell.Activate(screenRow, 2); //minus 1 because of new row Console.WriteLine("ItemDeleted"); break; default: break; } } } #endregion #region Button clicks private void buttonExpandAll_Click(object sender, System.EventArgs e) { this.gridDataBoundGrid1.ExpandAll(); } private void buttonCollapseAll_Click(object sender, System.EventArgs e) { this.gridDataBoundGrid1.CollapseAll(); } private void buttonChangeValue_Click(object sender, System.EventArgs e) { GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; //change a value in the underlying datasource somehow //here we know the object is a datarowview GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); object o = rs.ListManager.Current; DataRowView drv = (DataRowView) o; DataRow dr = drv.Row; dr[1] = "Changed.."; drv.EndEdit(); } private void buttonDeleteRow_Click(object sender, System.EventArgs e) { DataTable dt = this.dSet.Tables[0]; GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; int row = cc.RowIndex; int col = cc.ColIndex; GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); //remove the current record int i = rs.ListManager.Position; rs.ListManager.Position = i - 1; rs.ListManager.RemoveAt(i); RefreshCurrentParentNode(rs.ListManager.Position - 1); if(row >= this.gridDataBoundGrid1.Model.RowCount) row = row - 1; this.gridDataBoundGrid1.CurrentCell.MoveTo(row, col); } private void buttonInsertRow_Click(object sender, System.EventArgs e) { GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); //add a new record to the same level object o = rs.ListManager.Current; DataRowView drv = (DataRowView) o; DataRow dr = drv.Row; DataTable dt = this.dSet.Tables[rs.LevelIndex]; //get the table DataRow newRow = dt.NewRow(); object[] values = null; switch(rs.LevelIndex) { case 0: this.numberOfParents += 1; //pkValue = this.numberOfParents; values = new object[]{this.numberOfParents, string.Format("parentName{0}", this.numberOfParents)}; break; case 1: this.numberOfChildren += 1; //pkValue = this.numberOfChildren; values = new object[]{this.numberOfChildren, string.Format("ChildName{0}",this.numberOfChildren), dr[2]}; break; case 2: this.numberOfGrandChildren += 1; //pkValue = this.numberOfGrandChildren; values = new object[]{this.numberOfGrandChildren, string.Format("GrandChildName{0}",numberOfGrandChildren), dr[2], dr[3]}; break; default: throw new IndexOutOfRangeException("Improper index"); } newRow.ItemArray = values; dt.Rows.Add(newRow); RefreshCurrentParentNode(dt.Rows.Count); } #endregion #region helper methods //refreshes the row form the tableIndex position private void UpdateThisParentRow(int tableIndex) { for(int row = this.gridDataBoundGrid1.Model.Rows.HeaderCount + 1; row <= this.gridDataBoundGrid1.ViewLayout.LastVisibleRow; ++row) { if(this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row).LevelIndex == 0) { if(tableIndex == 0) { this.gridDataBoundGrid1.RefreshRange(GridRangeInfo.Row(row)); this.gridDataBoundGrid1.Model.ResetVolatileData(); return; } tableIndex--; } } } private void RefreshCurrentParentNode(int position) { //if the new row should be visible, then open & close its parent to rebind it... GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; //change a value in the underlying datasource somehow //here we know the object is a datarowview GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); if(rs.LevelIndex == 0) { int r = Math.Max(0, this.gridDataBoundGrid1.Binder.PositionToRowIndex(position)); gridDataBoundGrid1.CurrentCell.MoveTo(r, 1); gridDataBoundGrid1.RefreshRange(GridRangeInfo.Table()); return; } int parentLevel = rs.LevelIndex - 1; int row = cc.RowIndex - 1; while (row > this.gridDataBoundGrid1.Model.Rows.HeaderCount) { rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); if(rs.LevelIndex == parentLevel) break; row -= 1; } if(row > this.gridDataBoundGrid1.Model.Rows.HeaderCount) { this.gridDataBoundGrid1.Model.BeginUpdate(); this.gridDataBoundGrid1.CollapseAtRowIndex(row); this.gridDataBoundGrid1.ExpandAtRowIndex(row); this.gridDataBoundGrid1.CollapseAtRowIndex(row); this.gridDataBoundGrid1.ExpandAtRowIndex(row); this.gridDataBoundGrid1.Model.EndUpdate(); } } // locates the parent row for a given childlist private int findParentRowFromChildList(IBindingList list) { int parentRow = -1; if(list != null) { //it looks first from the current row up for(int i = this.gridDataBoundGrid1.CurrentCell.RowIndex; i > this.gridDataBoundGrid1.Model.Rows.HeaderCount; --i) { if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(i) && list == gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(i).ChildList) { parentRow = i; break; } } //if it doesn''t find it, it looks in teh second half if(parentRow == -1) { for(int i = this.gridDataBoundGrid1.CurrentCell.RowIndex + 1; i <= this.gridDataBoundGrid1.Model.RowCount; ++i) { if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(i) && list == gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(i).ChildList) { parentRow = i; break; } } } //the readon for breaking things at the current row is that most of teh time, it //is the current row that is of interest..... } return parentRow; } //this opens & closes the node at row private void RefreshRow(int row) { GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(row) && state != null && state.ChildCount > 0) { //slave the expand states of the node''s children bool[] expandState = new bool[state.ChildCount]; for(int i = 0; i < state.ChildCount; ++i) expandState[i] = this.gridDataBoundGrid1.IsExpandedAtRowIndex(row + i + 1); //close & open the node this.gridDataBoundGrid1.BeginUpdate(); this.gridDataBoundGrid1.CollapseAtRowIndex(row); this.gridDataBoundGrid1.ExpandAtRowIndex(row); //restore the expand states for(int i = 0; i < state.ChildCount; ++i) { if(i < expandState.GetUpperBound(0) && expandState[i]) this.gridDataBoundGrid1.ExpandAtRowIndex(row + i + 1); } this.gridDataBoundGrid1.EndUpdate(); } } // Counts the number of screenrows used by the children of the given row. // Uses recursion to loop through all the child levels of a given row adding // up the visible child rows. private int ScreenRowsInChildren(int row) { int rowCount = 0; if(gridDataBoundGrid1.IsExpandedAtRowIndex(row) ) { GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); if(state != null && state.ChildList != null) { for(int i = 0; i < state.ChildCount; ++i) { rowCount += 1 + ScreenRowsInChildren(row + i + 1); } } } return rowCount; } #endregion #region The DataTables private int numberOfGrandChildren = 50; private int numberOfChildren = 20; private int numberOfParents = 5; private Random r = new Random(); private DataTable GetParentTable() { DataTable dt = new DataTable("ParentTable"); dt.Columns.Add(new DataColumn("parentID")); //lower case p dt.Columns.Add(new DataColumn("ParentName")); for(int i = 0; i < numberOfParents; ++i) { DataRow dr = dt.NewRow(); dr[0] = i.ToString(); dr[1] = string.Format("parentName{0}", i); dt.Rows.Add(dr); } return dt; } private DataTable GetChildTable() { DataTable dt = new DataTable("ChildTable"); dt.Columns.Add(new DataColumn("childID")); //lower case c dt.Columns.Add(new DataColumn("Name")); dt.Columns.Add(new DataColumn("ParentID")); //upper case P for(int i = 0; i < numberOfChildren; ++i) { DataRow dr = dt.NewRow(); dr[0] = i.ToString(); dr[1] = string.Format("ChildName{0}",i); dr[2] = r.Next(numberOfParents).ToString(); dt.Rows.Add(dr); } return dt; } private DataTable GetGrandChildTable() { int numSports = 5; string[] sports = new string[]{"baseball","soccer","football","basketball","golf"}; DataTable dt = new DataTable("GrandChildTable"); dt.Columns.Add(new DataColumn("GrandChildID")); dt.Columns.Add(new DataColumn("Name")); dt.Columns.Add(new DataColumn("ChildID")); //upper case C dt.Columns.Add(new DataColumn("FavSport")); //upper case C for(int i = 0; i < numberOfGrandChildren; ++i) { DataRow dr = dt.NewRow(); dr[0] = i.ToString(); dr[1] = string.Format("GrandChildName{0}",i); dr[2] = r.Next(numberOfChildren).ToString(); dr[3] = sports[r.Next(numSports)]; dt.Rows.Add(dr); } return dt; } #endregion } } Thanks Satish >Hello. >How to implement "Delete" button not only for top-level table row, but for child rows too. >Thanks. >Current code: >private void button2_Click(object sender, System.EventArgs e) > { > Record r = this.gridGroupingControl1.Table.CurrentRecord; > if(r != null) > { > r.Delete(); > } > }

Administrator [Syncfusion]
Replied On July 6, 2004 03:34 AM

I am confused. There does not seem to be any gridGroupingControl1 in the code you pasted, but you initial post seemed to be asking about gridGroupingControl?

Administrator [Syncfusion]
Replied On July 6, 2004 03:40 AM

The code above is not for GridGroupingControl. :(

Administrator [Syncfusion]
Replied On July 6, 2004 09:17 AM

If you are using nested tables, you need to do more work to get at the current record. Attached is a little sample. That works if you select a record without any children. But right now, it trhoughs an exception if you try to delete a record with children. This is a bug that we will correct. MonthCalendar_1424.zip

Administrator [Syncfusion]
Replied On February 6, 2006 09:59 PM

>Here is the code... > >using System; >using System.Drawing; >using System.Collections; >using System.ComponentModel; >using System.Windows.Forms; >using System.Data; >using Syncfusion.Windows.Forms.Grid; > >namespace UpdateableExpandGrid >{ > /// > /// Summary description for Form1. > /// > public class Form1 : System.Windows.Forms.Form > { > private GridDataBoundGrid gridDataBoundGrid1; > private System.Windows.Forms.Button buttonExpandAll; > private System.Windows.Forms.Button buttonCollapseAll; > private System.Windows.Forms.Button buttonChangeValue; > private System.Windows.Forms.Button buttonDeleteRow; > private System.Windows.Forms.Button buttonInsertRow; > /// > /// Required designer variable. > /// > private System.ComponentModel.Container components = null; > > public Form1() > { > // > // Required for Windows Form Designer support > // > InitializeComponent(); > > // > // TODO: Add any constructor code after InitializeComponent call > // > } > > /// > /// Clean up any resources being used. > /// > protected override void Dispose( bool disposing ) > { > if( disposing ) > { > if (components != null) > { > components.Dispose(); > } > } > base.Dispose( disposing ); > } > > #region Windows Form Designer generated code > /// > /// Required method for Designer support - do not modify > /// the contents of this method with the code editor. > /// > private void InitializeComponent() > { > this.gridDataBoundGrid1 = new Syncfusion.Windows.Forms.Grid.GridDataBoundGrid(); > this.buttonExpandAll = new System.Windows.Forms.Button(); > this.buttonCollapseAll = new System.Windows.Forms.Button(); > this.buttonChangeValue = new System.Windows.Forms.Button(); > this.buttonDeleteRow = new System.Windows.Forms.Button(); > this.buttonInsertRow = new System.Windows.Forms.Button(); > ((System.ComponentModel.ISupportInitialize)(this.gridDataBoundGrid1)).BeginInit(); > this.SuspendLayout(); > // > // gridDataBoundGrid1 > // > this.gridDataBoundGrid1.AllowDragSelectedCols = true; > this.gridDataBoundGrid1.Anchor = (((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) > | System.Windows.Forms.AnchorStyles.Left) > | System.Windows.Forms.AnchorStyles.Right); > this.gridDataBoundGrid1.Location = new System.Drawing.Point(16, 56); > this.gridDataBoundGrid1.Name = "gridDataBoundGrid1"; > this.gridDataBoundGrid1.ShowCurrentCellBorderBehavior = Syncfusion.Windows.Forms.Grid.GridShowCurrentCellBorder.GrayWhenLostFocus; > this.gridDataBoundGrid1.Size = new System.Drawing.Size(520, 288); > this.gridDataBoundGrid1.SortBehavior = Syncfusion.Windows.Forms.Grid.GridSortBehavior.DoubleClick; > this.gridDataBoundGrid1.TabIndex = 0; > this.gridDataBoundGrid1.Text = "gridDataBoundGrid1"; > // > // buttonExpandAll > // > this.buttonExpandAll.Location = new System.Drawing.Point(16, 16); > this.buttonExpandAll.Name = "buttonExpandAll"; > this.buttonExpandAll.TabIndex = 1; > this.buttonExpandAll.Text = "ExpandAll"; > this.buttonExpandAll.Click += new System.EventHandler(this.buttonExpandAll_Click); > // hjvjhvjh > // buttonCollapseAll > // > this.buttonCollapseAll.Location = new System.Drawing.Point(88, 16); > this.buttonCollapseAll.Name = "buttonCollapseAll"; > this.buttonCollapseAll.TabIndex = 2; > this.buttonCollapseAll.Text = "CollapseAll"; > this.buttonCollapseAll.Click += new System.EventHandler(this.buttonCollapseAll_Click); > // > // buttonChangeValue > // > this.buttonChangeValue.Location = new System.Drawing.Point(160, 16); > this.buttonChangeValue.Name = "buttonChangeValue"; > this.buttonChangeValue.Size = new System.Drawing.Size(152, 23); > this.buttonChangeValue.TabIndex = 3; > this.buttonChangeValue.Text = "ChangeValueInCurrentRow"; > this.buttonChangeValue.Click += new System.EventHandler(this.buttonChangeValue_Click); > // > // buttonDeleteRow > // > this.buttonDeleteRow.Location = new System.Drawing.Point(312, 16); > this.buttonDeleteRow.Name = "buttonDeleteRow"; > this.buttonDeleteRow.Size = new System.Drawing.Size(112, 23); > this.buttonDeleteRow.TabIndex = 4; > this.buttonDeleteRow.Text = "DeleteCurrentRow"; > this.buttonDeleteRow.Click += new System.EventHandler(this.buttonDeleteRow_Click); > // > // buttonInsertRow > // > this.buttonInsertRow.Location = new System.Drawing.Point(424, 16); > this.buttonInsertRow.Name = "buttonInsertRow"; > this.buttonInsertRow.Size = new System.Drawing.Size(112, 23); > this.buttonInsertRow.TabIndex = 5; > this.buttonInsertRow.Text = "InsertAtCurrentRow"; > this.buttonInsertRow.Click += new System.EventHandler(this.buttonInsertRow_Click); > // > // Form1 > // > this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); > this.ClientSize = new System.Drawing.Size(552, 358); > this.Controls.AddRange(new System.Windows.Forms.Control[] { > this.buttonInsertRow, > this.buttonDeleteRow, > this.buttonChangeValue, > this.buttonCollapseAll, > this.buttonExpandAll, > this.gridDataBoundGrid1}); > this.Name = "Form1"; > this.Text = "Form1"; > this.Load += new System.EventHandler(this.Form1_Load); > ((System.ComponentModel.ISupportInitialize)(this.gridDataBoundGrid1)).EndInit(); > this.ResumeLayout(false); > > } > #endregion > > /// > /// The main entry point for the application. > /// > [STAThread] > static void Main() > { > Application.Run(new Form1()); > } > > private DataSet dSet; > GridHierarchyLevel hlParentToChild; > GridHierarchyLevel hlChildToGrandChild; > GridHierarchyLevel hlParent; > > private void Form1_Load(object sender, System.EventArgs e) > { > //dataset ============================================== > dSet = new DataSet(); > > DataTable parentTable = GetParentTable(); > DataTable childTable = GetChildTable(); > DataTable grandChildTable = GetGrandChildTable(); > dSet.Tables.AddRange(new DataTable[]{parentTable, childTable, grandChildTable}); > > //setup the relations ======================================== > DataColumn parentColumn = parentTable.Columns["parentID"]; > DataColumn childColumn = childTable.Columns["ParentID"]; > dSet.Relations.Add("ParentToChild", parentColumn, childColumn); > > parentColumn = childTable.Columns["childID"]; > childColumn = grandChildTable.Columns["ChildID"]; > dSet.Relations.Add("ChildToGrandChild", parentColumn, childColumn); > > //expand grid =================================================== > this.gridDataBoundGrid1.DataSource = parentTable; > hlParentToChild = this.gridDataBoundGrid1.Binder.AddRelation("ParentToChild"); > hlChildToGrandChild = this.gridDataBoundGrid1.Binder.AddRelation("ChildToGrandChild"); > hlParent = this.gridDataBoundGrid1.Binder.RootHierarchyLevel; > > //hlParentToChild.ShowHeaders = false; > //hlChildToGrandChild.ShowHeaders = false; > //hlParent.ShowHeaders = false; > > //setup the parentgridlayout > hlParent.LayoutColumns(new string[]{"parentID", "ParentName", " ", " "}); > this.gridDataBoundGrid1.Model.CoveredRanges.Add(GridRangeInfo.Cells(0, 4, 0, 5)); > > //gray the last 2 columns > GridStyleInfo style = hlParent.InternalColumns[2].StyleInfo; > style.Borders.All = new GridBorder(GridBorderStyle.None); > style.BackColor = SystemColors.Control; > style.CellType = "Static"; > style.Enabled = false; > > style = hlParent.InternalColumns[3].StyleInfo; > style.Borders.All = new GridBorder(GridBorderStyle.None); > style.BackColor = SystemColors.Control; > style.CellType = "Static"; > style.Enabled = false; > > hlParent.RowStyle.BackColor = Color.PaleGoldenrod; > > //setup the child gridlayout > hlParentToChild.LayoutColumns(new string[]{"childID", "Name", "ParentID", " "}); > //gray the last column > style = hlParentToChild.InternalColumns[3].StyleInfo; > style.Borders.All = new GridBorder(GridBorderStyle.None); > style.BackColor = SystemColors.Control; > style.CellType = "Static"; > style.Enabled = false; > > hlParentToChild.RowStyle.BackColor = Color.LightGoldenrodYellow; > > this.gridDataBoundGrid1.AllowResizeToFit = false; > this.gridDataBoundGrid1.Model.ColWidths.ResizeToFit(GridRangeInfo.Rows(0, 2), GridResizeToFitOptions.IncludeHeaders); > > this.gridDataBoundGrid1.Model.ColWidths[1] = 20; > this.gridDataBoundGrid1.Model.ColWidths[3] = 120; > > //handle Row expanding/collapse to hook bindlinglist.ListChanged event > // for the child tables > this.gridDataBoundGrid1.RowCollapsing += new GridRowEventHandler(grid_RowCollapsing); > this.gridDataBoundGrid1.RowExpanded += new GridRowEventHandler(grid_RowExpanded); > > //handle to listen to teh changed event for the parent table > CurrencyManager cm = (CurrencyManager)this.BindingContext[this.gridDataBoundGrid1.DataSource, this.gridDataBoundGrid1.DataMember]; > ((IBindingList)cm.List).ListChanged += new ListChangedEventHandler(list_ListChanged); > } > > #region Dynamically hooking and unhooking ListChanged event > > //ParentNodesOfExpandedNodes holds a list of parent nodes: key - parent nodes value- arraylist of ChildLists > // used when a parent node is close so all children listchanged event handlers can be unhooked > private Hashtable ParentNodesOfExpandedNodes = new Hashtable(); > > //hook the ListChange event for the node that opened > //and save its parent node in the ParentNodesOfExpandedNodes hashtable > private void grid_RowExpanded(object sender, GridRowEventArgs e) > { > GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(e.RowIndex); > > if(state.ChildList != null) > { > ((IBindingList)state.ChildList).ListChanged += new ListChangedEventHandler(list_ListChanged); > Console.WriteLine(" HOOKED " + e.RowIndex.ToString()); > if(state.Parent != null) > { > SaveParentNode(state); > } > } > } > > //help method that save the parent node of an expanded child > // so, later if you close teh paerent, the child''s listchanged event can also be unhooked > private void SaveParentNode(GridBoundRecordState state) > { > if(ParentNodesOfExpandedNodes.ContainsKey(state.Parent)) > { > ArrayList al = (ArrayList)ParentNodesOfExpandedNodes[state.Parent]; > al.Add(state.ChildList); > } > else > { > ArrayList al = new ArrayList(); > al.Add(state.ChildList); > ParentNodesOfExpandedNodes.Add(state.Parent, al); > } > } > > //here we unhook the ListChnaged event for teh node this closing > //as well as any child ListChanged event that is hooked > private void grid_RowCollapsing(object sender, GridRowEventArgs e) > { > ResetNodeAndChildNodesAtRow(e.RowIndex); > } > > //helper method that unhooks teh ListChanged event of teh row plus as well > // as the listchanged events of any children node. Uses the ParentNodesOfExpandedNodes hahtable > // to get at the children > private void ResetNodeAndChildNodesAtRow(int row) > { > GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); > if(state.ChildList != null) > { > ((IBindingList)state.ChildList).ListChanged -= new ListChangedEventHandler(list_ListChanged); > Console.WriteLine("UNHOOKED " + row.ToString()); > } > if(ParentNodesOfExpandedNodes.ContainsKey(state)) > { > ArrayList al = (ArrayList)ParentNodesOfExpandedNodes[state]; > foreach(IBindingList list in al) > { > list.ListChanged -= new ListChangedEventHandler(list_ListChanged); > Console.WriteLine("UNHOOKEDc " + row.ToString()); > } > ParentNodesOfExpandedNodes.Remove(state); > } > } > > #endregion > > #region ListChanged event handler that reacts to child changes > > private void list_ListChanged(object sender, ListChangedEventArgs e) > { > IBindingList list = (IBindingList) sender; > if(list != null) > { > //find the parent row... > int parentRow = findParentRowFromChildList(list); > if(parentRow == -1) > { > //we have a parent row. Check for change. > if(e.ListChangedType == ListChangedType.ItemChanged) > { > > UpdateThisParentRow(e.NewIndex); > } > else if(e.ListChangedType == ListChangedType.ItemAdded || > e.ListChangedType == ListChangedType.ItemDeleted) > { > UpdateThisParentRow(e.NewIndex); > this.gridDataBoundGrid1.Refresh(); > } > > return; > } > > //recurs = 0; > int screenRow = parentRow + e.NewIndex + 1;// - this.gridDataBoundGrid1.TopRowIndex - 1; > for(int j = 1; j <= e.NewIndex; ++j) > screenRow += ScreenRowsInChildren(parentRow + j); > > > Console.WriteLine("Item#=" + e.NewIndex.ToString() + " parentRow: " + parentRow.ToString() + " screenRow: " + screenRow.ToString()); > > switch(e.ListChangedType) > { > case ListChangedType.ItemChanged: > //just redraw screen row to show the change > this.gridDataBoundGrid1.RefreshRange(GridRangeInfo.Row(screenRow)); > Console.WriteLine("ItemChanged"); > break; > case ListChangedType.ItemAdded: > //this opens & closes the parent node > RefreshRow(parentRow); > > //put the currentcell somewhere > this.gridDataBoundGrid1.Focus(); > this.gridDataBoundGrid1.CurrentCell.Activate(screenRow - 1, 2); //minus 1 because of new row > Console.WriteLine("ItemAdded"); > > break; > case ListChangedType.ItemDeleted: > //this opens & closes the parent node > RefreshRow(parentRow); > > //put the currentcell somewhere > this.gridDataBoundGrid1.Focus(); > this.gridDataBoundGrid1.CurrentCell.Activate(screenRow, 2); //minus 1 because of new row > Console.WriteLine("ItemDeleted"); > break; > default: > break; > } > } > } > > #endregion > > #region Button clicks > private void buttonExpandAll_Click(object sender, System.EventArgs e) > { > this.gridDataBoundGrid1.ExpandAll(); > } > > private void buttonCollapseAll_Click(object sender, System.EventArgs e) > { > this.gridDataBoundGrid1.CollapseAll(); > } > > private void buttonChangeValue_Click(object sender, System.EventArgs e) > { > GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; > > //change a value in the underlying datasource somehow > //here we know the object is a datarowview > GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); > object o = rs.ListManager.Current; > DataRowView drv = (DataRowView) o; > DataRow dr = drv.Row; > dr[1] = "Changed.."; > drv.EndEdit(); > > } > > private void buttonDeleteRow_Click(object sender, System.EventArgs e) > { > DataTable dt = this.dSet.Tables[0]; > > GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; > int row = cc.RowIndex; > int col = cc.ColIndex; > GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); > > //remove the current record > int i = rs.ListManager.Position; > rs.ListManager.Position = i - 1; > rs.ListManager.RemoveAt(i); > > RefreshCurrentParentNode(rs.ListManager.Position - 1); > if(row >= this.gridDataBoundGrid1.Model.RowCount) > row = row - 1; > > this.gridDataBoundGrid1.CurrentCell.MoveTo(row, col); > } > > private void buttonInsertRow_Click(object sender, System.EventArgs e) > { > GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; > GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); > > //add a new record to the same level > object o = rs.ListManager.Current; > DataRowView drv = (DataRowView) o; > DataRow dr = drv.Row; > > DataTable dt = this.dSet.Tables[rs.LevelIndex]; //get the table > DataRow newRow = dt.NewRow(); > object[] values = null; > switch(rs.LevelIndex) > { > case 0: > this.numberOfParents += 1; > //pkValue = this.numberOfParents; > values = new object[]{this.numberOfParents, string.Format("parentName{0}", this.numberOfParents)}; > break; > case 1: > this.numberOfChildren += 1; > //pkValue = this.numberOfChildren; > values = new object[]{this.numberOfChildren, string.Format("ChildName{0}",this.numberOfChildren), dr[2]}; > break; > case 2: > this.numberOfGrandChildren += 1; > //pkValue = this.numberOfGrandChildren; > values = new object[]{this.numberOfGrandChildren, string.Format("GrandChildName{0}",numberOfGrandChildren), dr[2], dr[3]}; > break; > default: > throw new IndexOutOfRangeException("Improper index"); > > } > > newRow.ItemArray = values; > dt.Rows.Add(newRow); > > > RefreshCurrentParentNode(dt.Rows.Count); > > } > > #endregion > > #region helper methods > > //refreshes the row form the tableIndex position > private void UpdateThisParentRow(int tableIndex) > { > for(int row = this.gridDataBoundGrid1.Model.Rows.HeaderCount + 1; row <= this.gridDataBoundGrid1.ViewLayout.LastVisibleRow; ++row) > { > if(this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row).LevelIndex == 0) > { > if(tableIndex == 0) > { > this.gridDataBoundGrid1.RefreshRange(GridRangeInfo.Row(row)); > this.gridDataBoundGrid1.Model.ResetVolatileData(); > return; > } > tableIndex--; > } > } > } > > private void RefreshCurrentParentNode(int position) > { > //if the new row should be visible, then open & close its parent to rebind it... > > GridCurrentCell cc = this.gridDataBoundGrid1.CurrentCell; > //change a value in the underlying datasource somehow > //here we know the object is a datarowview > GridBoundRecordState rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(cc.RowIndex); > > > if(rs.LevelIndex == 0) > { > int r = Math.Max(0, this.gridDataBoundGrid1.Binder.PositionToRowIndex(position)); > gridDataBoundGrid1.CurrentCell.MoveTo(r, 1); > gridDataBoundGrid1.RefreshRange(GridRangeInfo.Table()); > return; > } > int parentLevel = rs.LevelIndex - 1; > > > > int row = cc.RowIndex - 1; > > while (row > this.gridDataBoundGrid1.Model.Rows.HeaderCount) > { > rs = this.gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); > if(rs.LevelIndex == parentLevel) > break; > row -= 1; > } > > if(row > this.gridDataBoundGrid1.Model.Rows.HeaderCount) > { > this.gridDataBoundGrid1.Model.BeginUpdate(); > this.gridDataBoundGrid1.CollapseAtRowIndex(row); > this.gridDataBoundGrid1.ExpandAtRowIndex(row); > this.gridDataBoundGrid1.CollapseAtRowIndex(row); > this.gridDataBoundGrid1.ExpandAtRowIndex(row); > > this.gridDataBoundGrid1.Model.EndUpdate(); > > } > > } > > > > // locates the parent row for a given childlist > private int findParentRowFromChildList(IBindingList list) > { > int parentRow = -1; > if(list != null) > { > //it looks first from the current row up > for(int i = this.gridDataBoundGrid1.CurrentCell.RowIndex; i > this.gridDataBoundGrid1.Model.Rows.HeaderCount; --i) > { > if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(i) && > list == gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(i).ChildList) > { > parentRow = i; > break; > } > } > > //if it doesn''t find it, it looks in teh second half > if(parentRow == -1) > { > for(int i = this.gridDataBoundGrid1.CurrentCell.RowIndex + 1; i <= this.gridDataBoundGrid1.Model.RowCount; ++i) > { > if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(i) && > list == gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(i).ChildList) > { > parentRow = i; > break; > } > } > } > > //the readon for breaking things at the current row is that most of teh time, it > //is the current row that is of interest..... > } > return parentRow; > } > > > //this opens & closes the node at row > private void RefreshRow(int row) > { > GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); > if(this.gridDataBoundGrid1.IsExpandedAtRowIndex(row) > && state != null && state.ChildCount > 0) > { > //slave the expand states of the node''s children > bool[] expandState = new bool[state.ChildCount]; > for(int i = 0; i < state.ChildCount; ++i) > expandState[i] = this.gridDataBoundGrid1.IsExpandedAtRowIndex(row + i + 1); > > //close & open the node > this.gridDataBoundGrid1.BeginUpdate(); > this.gridDataBoundGrid1.CollapseAtRowIndex(row); > this.gridDataBoundGrid1.ExpandAtRowIndex(row); > > //restore the expand states > for(int i = 0; i < state.ChildCount; ++i) > { > if(i < expandState.GetUpperBound(0) && expandState[i]) > this.gridDataBoundGrid1.ExpandAtRowIndex(row + i + 1); > } > this.gridDataBoundGrid1.EndUpdate(); > } > } > > // Counts the number of screenrows used by the children of the given row. > // Uses recursion to loop through all the child levels of a given row adding > // up the visible child rows. > private int ScreenRowsInChildren(int row) > { > int rowCount = 0; > if(gridDataBoundGrid1.IsExpandedAtRowIndex(row) ) > { > GridBoundRecordState state = gridDataBoundGrid1.Binder.GetRecordStateAtRowIndex(row); > if(state != null && state.ChildList != null) > { > for(int i = 0; i < state.ChildCount; ++i) > { > rowCount += 1 + ScreenRowsInChildren(row + i + 1); > } > > } > } > return rowCount; > } > > #endregion > > #region The DataTables > > private int numberOfGrandChildren = 50; > private int numberOfChildren = 20; > private int numberOfParents = 5; > > private Random r = new Random(); > > private DataTable GetParentTable() > { > DataTable dt = new DataTable("ParentTable"); > > dt.Columns.Add(new DataColumn("parentID")); //lower case p > dt.Columns.Add(new DataColumn("ParentName")); > > for(int i = 0; i < numberOfParents; ++i) > { > DataRow dr = dt.NewRow(); > dr[0] = i.ToString(); > dr[1] = string.Format("parentName{0}", i); > dt.Rows.Add(dr); > } > > return dt; > } > > private DataTable GetChildTable() > { > DataTable dt = new DataTable("ChildTable"); > > dt.Columns.Add(new DataColumn("childID")); //lower case c > dt.Columns.Add(new DataColumn("Name")); > dt.Columns.Add(new DataColumn("ParentID")); //upper case P > > > for(int i = 0; i < numberOfChildren; ++i) > { > DataRow dr = dt.NewRow(); > dr[0] = i.ToString(); > dr[1] = string.Format("ChildName{0}",i); > dr[2] = r.Next(numberOfParents).ToString(); > dt.Rows.Add(dr); > } > > return dt; > } > > private DataTable GetGrandChildTable() > { > int numSports = 5; > string[] sports = new string[]{"baseball","soccer","football","basketball","golf"}; > > DataTable dt = new DataTable("GrandChildTable"); > > dt.Columns.Add(new DataColumn("GrandChildID")); > dt.Columns.Add(new DataColumn("Name")); > dt.Columns.Add(new DataColumn("ChildID")); //upper case C > dt.Columns.Add(new DataColumn("FavSport")); //upper case C > > for(int i = 0; i < numberOfGrandChildren; ++i) > { > DataRow dr = dt.NewRow(); > dr[0] = i.ToString(); > dr[1] = string.Format("GrandChildName{0}",i); > dr[2] = r.Next(numberOfChildren).ToString(); > dr[3] = sports[r.Next(numSports)]; > dt.Rows.Add(dr); > } > > return dt; > } > #endregion > > } >} > >Thanks >Satish > >>Hello. >>How to implement "Delete" button not only for top-level table row, but for child rows too. >>Thanks. >>Current code: >>private void button2_Click(object sender, System.EventArgs e) >> { >> Record r = this.gridGroupingControl1.Table.CurrentRecord; >> if(r != null) >> { >> r.Delete(); >> } >> }

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