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How can I autosize the rowheights in my datagrid

Platform: WinForms| Category: Datagrid

Here is a solution suggested by Matthew Benedict. It uses reflection to access the protected DataGridRows collection so he can
set the row height.

               public void AutoSizeGrid() 
                { 
                        // DataGrid should be bound to a DataTable for this part to 
                        // work. 
                        int numRows = ((DataTable)gridTasks.DataSource).Rows.Count; 
                        Graphics g = Graphics.FromHwnd(gridTasks.Handle); 
                        StringFormat sf = new StringFormat(StringFormat.GenericTypographic); 
                        SizeF size; 

                        // Since DataGridRows[] is not exposed directly by the DataGrid 
                        // we use reflection to hack internally to it.. There is actually 
                        // a method get_DataGridRows that returns the collection of rows 
                        // that is what we are doing here, and casting it to a System.Array 
                        MethodInfo mi = gridTasks.GetType().GetMethod('get_DataGridRows',
                                                  BindingFlags.FlattenHierarchy | BindingFlags.IgnoreCase | BindingFlags.Instance
                                                  | BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);

                        System.Array dgra = (System.Array)mi.Invoke(gridTasks,null); 

                        // Convert this to an ArrayList, little bit easier to deal with 
                        // that way, plus we can strip out the newrow row. 
                        ArrayList DataGridRows = new ArrayList(); 
                        foreach (object dgrr in dgra) 
                        { 
                                if (dgrr.ToString().EndsWith('DataGridRelationshipRow')==true) 
                                        DataGridRows.Add(dgrr); 
                        } 

                        // Now loop through all the rows in the grid 
                        for (int i = 0; i < numRows; ++i) 
                        { 
                                // Here we are telling it that the column width is set to 
                                // 400.. so size will contain the Height it needs to be. 
                                size = g.MeasureString(gridTasks[i,1].ToString(),gridTasks.Font,400,sf); 
                                int h = Convert.ToInt32(size.Height); 
                                // Little extra cellpadding space 
                                h = h + 8; 

                                // Now we pick that row out of the DataGridRows[] Array 
                                // that we have and set it’s Height property to what we 
                                // think it should be. 
                                PropertyInfo pi = DataGridRows[i].GetType().GetProperty('Height'); 
                                pi.SetValue(DataGridRows[i],h,null); 

                                // I have read here that after you set the Height in this manner that you should 
                                // Call the DataGrid Invalidate() method, but I haven’t seen any prob with not calling it..

                        } 

                        g.Dispose(); 
                } 

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