Cannot bind to an empty custom collection.

220

Scott F. Brown posted over 16 years ago

I have a custom business object that inherits from List<t> that I am binding to using ObjectDataSource. It works great when there is data present. However, if there is no data returned, I get the following error:

Data source contains no schema data.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NotSupportedException: Data source contains no schema data.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NotSupportedException: Data source contains no schema data.]
   Infragistics.Web.UI.GridControls.WebDataGrid.DataBind() +678
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +82
   Infragistics.Web.UI.Framework.Data.FlatDataBoundControl.EnsureDataBound() +84
   Infragistics.Web.UI.GridControls.WebDataGrid.EnsureDataBound() +168
   Infragistics.Web.UI.GridControls.WebDataGrid.CreateChildControls() +43
   System.Web.UI.Control.EnsureChildControls() +87
   Infragistics.Web.UI.GridControls.WebDataGrid.EnsureChildControls() +113
   System.Web.UI.Control.PreRenderRecursiveInternal() +44
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Control.PreRenderRecursiveInternal() +171
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +842

I am completely stuck on this one. Any help would be greatly appreciated.

Parents

No Data

Reply

3147

[Infragistics] Nikola Genov posted over 16 years ago

Hi Bomlin,
For now you can add an error template to WebDataGrid as a workaround, for example:
<ErrorTemplate>No data</ErrorTemplate>

In the meantime we'll research and fix that issue. Thanks for reprting it!
Cancel
Reply

Cancel

Children

220

Scott F. Brown posted over 16 years ago in reply to [Infragistics] Nikola Genov

Thanks Nikola,

I hadn't noticed the ErrorTemplate before and it worked like a charm.

And to help with tracking the problem, here is my HTML. The data being passed to the ObjectDataSource is an empty (not null) object that inherits from List<t>.
<ig:WebDataGrid ID="UI_grdMemos" runat="server"
AutoGenerateColumns="False" DataSourceID="MemoDataSource" Height="266px"
Width="800px"

style="margin-right: 1px">

<EmptyRowsTemplate>

No rows found

</EmptyRowsTemplate>

<ErrorTemplate>

No rows found

</ErrorTemplate>

<Behaviors>

<ig:RowSelectors>

</ig:RowSelectors>
<ig:Selection CellClickAction="Row" CellSelectType="None"
ColumnSelectType="Multiple" RowSelectType="Single">

</ig:Selection>

<ig:Sorting Enabled="true" SortingMode="Single"></ig:Sorting>

<ig:ColumnResizing>

</ig:ColumnResizing>

<ig:Filtering>

</ig:Filtering>

</Behaviors>

<Columns>

<ig:BoundDataField DataFieldName="Id" Key="Id" Width="70px">

<Header Text="Memo ID" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="Title" Key="Title" Width="250px">

<Header Text="Title" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="CurrentUserName" Key="CurrentUserName">

<Header Text="Current User" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="LastUpdate" Key="LastUpdate">

<Header Text="LastUpdate" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="Status" Key="Status">

<Header Text="Status" />

</ig:BoundDataField>

<ig:BoundDataField DataFieldName="Priority" Key="Priority">

<Header Text="Priority" />

</ig:BoundDataField>

</Columns>

</ig:WebDataGrid>
Cancel
Reply

Cancel