TableDescriptor.Columns.Count raise exception

[Sergey Merkuriev]

Exception happen in following call gridGroupingControl.TableDescriptor.Columns.Count;

for(int index = 0; index < gridGroupingControl.TableDescriptor.Columns.Count; index++)
{
...
}

Exception content:

"Object reference not set to an instance of an object."

"Syncfusion.Grid.Grouping.Windows"

at Syncfusion.Windows.Forms.Grid.Grouping.GridGroupingControl.engine_SourceListChanged(Object sender, EventArgs e)
at System.EventHandler.Invoke(Object sender, EventArgs e)
at Syncfusion.Grouping.Engine.OnSourceListChanged(EventArgs e)
at Syncfusion.Windows.Forms.Grid.Grouping.GridEngineBase.OnSourceListChanged(EventArgs e)
at Syncfusion.Grouping.Engine.SetSourceList(IEnumerable value)
at Syncfusion.Windows.Forms.Grid.Grouping.GridEngineBase.SetCurrencyManager(CurrencyManager value)
at Syncfusion.Windows.Forms.Grid.Grouping.GridEngineBase.get_CurrencyManager()
at Syncfusion.Windows.Forms.Grid.Grouping.GridEngineBase.GetSourceListBase()
at Syncfusion.Grouping.Engine.GetSourceList()
at Syncfusion.Grouping.FieldDescriptorCollection.EnsureInitialized(Boolean populate)
at Syncfusion.Grouping.FieldDescriptorCollection.get_Count()
at Syncfusion.Windows.Forms.Grid.Grouping.GridColumnDescriptorCollection.EnsureInitialized(Boolean populate)
at Syncfusion.Windows.Forms.Grid.Grouping.GridColumnDescriptorCollection.get_Count()
at OpsCenter.UI.Editor.Grid.AsbtractGridController`1.Render(Object dataSource, ICollection`1 dataProperties) in C:\Projects\Petris\Chinook\OpsCenter\v5\Trunk\OpsCenter.UI\Editor\Grid\AsbtractGridController.cs:line 714



Untitled_17f9d887.png

[Lingaraj S]

Hi Sergey,

Thank you for your interest in Syncfusion product.

The issue might have occurred due to the improper binding of data source in GridGroupingControl. So please try using following step to bind the data source in GridGroupingControl

Refer the code below:

this.gridGroupingControl1.BeginUpdate();
this.gridGroupingControl1.TableDescriptor.Reset();
this.gridGroupingControl1.DataSource = null;
this.gridGroupingControl1.DataMember = null;
this.gridGroupingControl1.DataSource = array;
this.gridGroupingControl1.EndUpdate(true);
this.gridGroupingControl1.Refresh();

Please let me know if you have any queries.

Regards,
Lingaraj S.

[Sergey Merkuriev]

This way I have null reference exception when all BeginUpdate.

All that happen if I try display DataTable with zero rows and columns.

[Jisha Joy]

Hi Sergey,

It is difficult to identify the problem without seeing it in a live application. Could you please provide us a sample that shows issue or reprodcue the issue in any one of our browser sample?. So that we could analyze it further annd provide a better solution.

Thank you for using Syncfusion products.

Regards,
Jisha