[Solved] Dynamically generated grid databinding problem

[Mirosław Pragłowski]

Hello,

I've a problem with (as I suppose) data binding to dynamically generated grid.

Below you will find events fired when I try to edit item in grid (InPlace).

Columns in grid are dynamically generated - bacically there are 2 types of columns:

- dictionary: GridDropDownColumn (working ok)

- numeric: GridNumericColumn (cause of problems)

Grid could have multiple columns of both types depending on the underlying business object.

Problem is: when I click edit on grid item the editors are not showing.

Here is a events trace which are raised:

// loading a page 

Page_Init

GenerateDefinitionColumns

CreateColumnForVariable: Dictionary 1

CreateColumnForVariable: Numeric 1

rgDefinitionItems_NeedDataSource

rgDefinitionItems_CreateColumnEditor: Creating column editor for column: IN1

rgDefinitionItems_ItemDataBound: Binding item in view mode

rgDefinitionItems_ItemDataBound: Binding item in view mode

// here I've clicked edit button on grid

Page_Init after postback

rgDefinitionItems_CreateColumnEditor: Creating column editor for column: IN1

rgDefinitionItems_ItemCommand: Command name: Edit

rgDefinitionItems_NeedDataSource

rgDefinitionItems_ItemDataBound: Binding item in edit mode

rgDefinitionItems_CreateColumnEditor: Creating column editor for column: OUT2

In attached sample project you could methods GetCellValue & SetValueToCell 

responsible for geting and setting value into cell (in both view and edit mode).

If you remove from those methods "if (dataItem[columnUniqueName].Controls.Count > 0)"

you will see my problem - the editor control for numeric column is not created yet :(

Source code for this problem can be downloaded from dropbox:

http://dl.getdropbox.com/u/1495591/RadGridDataBindingProblem.zip

Any ideas what's wrong ?

[Mirosław Pragłowski]

More details:

If you disable ajax it is clear what is causing that editors are not shown, here is a stack trace:

[ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index]
   System.Web.UI.ControlCollection.get_Item(Int32 index) +8670146
   Telerik.Web.UI.GridNumericColumnEditor.LoadControlsFromContainer() +67
   Telerik.Web.UI.GridColumnEditorBase.InitializeFromControl(Control containerControl) +50
   Telerik.Web.UI.GridDataItem.InitializeEditorInCell(IGridEditableColumn column) +157
   Telerik.Web.UI.GridEditManager.GetColumnEditor(IGridEditableColumn column) +175
   Telerik.Web.UI.GridBoundColumn.FillValues(IDictionary newValues, GridEditableItem editableItem) +81
   Telerik.Web.UI.GridEditableItem.ExtractValues(IDictionary newValues) +175
   Telerik.Web.UI.GridTableView.ExtractValuesFromItem(IDictionary newValues, GridEditableItem editedItem) +116
   Telerik.Web.UI.GridItemBuilder.CreateItems(GridGroupingContext group) +1211
   Telerik.Web.UI.GridTableView.CreateItems(IEnumerator enumerator, GridColumn[] columns, ControlCollection controls) +187
   Telerik.Web.UI.GridTableView.CreateControlHierarchy(Boolean useDataSource) +1077
   Telerik.Web.UI.GridTableView.CreateChildControls(IEnumerable dataSource, Boolean useDataSource) +786
   System.Web.UI.WebControls.CompositeDataBoundControl.PerformDataBinding(IEnumerable data) +57
   System.Web.UI.WebControls.DataBoundControl.OnDataSourceViewSelectCallback(IEnumerable data) +114
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +31
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +142
   Telerik.Web.UI.GridTableView.PerformSelect() +28
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +73
   Telerik.Web.UI.GridTableView.DataBind() +368
   Telerik.Web.UI.GridTableView.Rebind() +98
   Telerik.Web.UI.GridCommandEventArgs.ExecuteCommand(Object source) +395
   Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e) +191
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e) +165
   System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +37
   System.Web.UI.WebControls.ImageButton.OnCommand(CommandEventArgs e) +111
   System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +176
   System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565

So still the question is why the editor for numeric column in not created before ItemDataBound event ? 

[Veli]

Hi Mirosław,

I can see that you are creating RadGrid columns dynamically of declarative RadGrid first in Page_Init, then in Page_PreRender after postback.

To have RadGrid properly initialize its dynamic columns, you need observe a couple of requirements for dynamic initialization. Here are a few articles for more information:

Programmatic creation

Changing the grid structure dynamically on postback

In the second article, you can see our recommendation. You need to create the entire grid in Page_Init and add it to the controls collection of your form. Additionally, you need to set EnableColumnViewState="false" in the MasterTableView properties, so that the grid knows the columns collection may change.

Kind regards,
Veli
the Telerik team

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