Non overloadable GridTableView creation.

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Last Updated: 28 Jun 2019 11:50 by ADMIN

product

Created on: 10 Dec 2018 08:23

Category: Grid

Type: Bug Report

Non overloadable GridTableView creation.

In GridTableView.cs, you provide a function
 protected virtual GridTableView CreateTableView() (Line 7828).
This function can be overloaded to return derived classes from GridTableView.

But, this is not overloadable completely. Because you create a GridTableView directly in protected void BuildDetailTablesFromDataSource() (Line 8808), too.
There you would have to call a virtual creator function, too.

This is necessary, because I have a lot of Trouble with your DataBind which I was able to fix with an overload. It is much to hard to make this bug visible for you, I really tried to do so already, but I had to fix this that way, because your GridTableView without my derivation fails in our szenario.

The call stack for that problem, I'd had to fix, is always like:
Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IndexOutOfRangeException: Cannot find column CheckSum.
                  at System.Data.DataTable.ParseSortString(String sortString)
                  at System.Data.DataView.set_Sort(String value)
                  at Telerik.Web.UI.GridEnumerableFromDataView.PerformTransformation()
                  at Telerik.Web.UI.GridEnumerableFromDataView.TransformEnumerable()
                  at Telerik.Web.UI.GridTableView.GetEnumerator(Boolean useDataSource, GridEnumerableBase resolvedDataSource, ArrayList dataKeysArray, Boolean shouldClearDataKeys)
                  at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
                  at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
                  at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
                  at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
                  at Telerik.Web.UI.GridTableView.PerformSelect()
                  at Telerik.Web.UI.GridTableView.DataBind()
                  at Telerik.Web.UI.GridItemBuilder.BindDetailTable(GridDataItem parentItem, GridTableView cloned)
                  at Telerik.Web.UI.GridItemBuilder.BindDetailTables(GridDataItem parentItem, GridNestedViewItem detailItem)
                  at Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group)
                  at Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls)
                  at Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource)
                  at Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource)
                  at System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data)
                  at System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data)
                  at Telerik.Web.UI.GridTableView.PerformSelect()
                  at Telerik.Web.UI.GridTableView.DataBind()


In that, your DataTableView gets an invalid sort Expression string. Therefore, I overwrote DataBind.

But this is not possible in all cases, if you create GridViewTable() objects on your own.

Best regards

1 comment

ADMIN

Eyup

Posted on: 28 Jun 2019 11:50

Hello Dirk,

Thank you for sharing your findings, however, I'm afraid inheriting/overriding Telerik classes and controls on server-side is not supported, even if the new class/control is inherited directly from the Telerik component. In such cases, we highly suggest that Web User Controls should be used instead.

As for the binding issue, if you are using programmatic binding, check the code-behind code logic for any place which calls MyRadGridName.DataBind(). Programmatic binding should happen only using the NeedDataSource event handler:
https://www.telerik.com/support/kb/aspnet-ajax/grid/details/how-to-bind-radgrid-properly-on-server-side

Thank you for your understanding. If there is still an issue after these changes, I suggest that you open a formal support ticket and send us a very basic isolated sample to demonstrate the issue so we can investigate it further and log it accordingly, if it turns out to be a bug in a supported configuration scenario.

Regards,
Eyup
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