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How to bind a gridview column to a subclass value?

I have an ASP.net gridview I'm trying to associate with. My DataSource has a collection and 2 of the columns that I link are part of a subclass. My DataSource has a subclass of "Staff" containing personnel information. Related fields SurveyID and NumberOfExceptions are perfectly related, but Staff.Name and Staff.Office cannot be connected.

asp:BoundField DataField="SurveyID" HeaderText="ID" ... asp:BoundField DataField="Staff.Name" HeaderText="Name" ... asp:BoundField DataField="Staff.Office" HeaderText="Office" ... asp:BoundField DataField="NumberOfExceptions" HeaderText="Exceptions" ...

And the code behind:

 uxSurveyGrid.DataSource = searchResults; uxSurveyGrid.DataBind();

If I type searchResults[0].Staff.Name in the code behind, I see this value, why can't the runtime evaluate Staff.Name in gridview?

How do you bind columns to subclass values? Should I do this in code?

Any help would be appreciated

Mark.

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4 answers

I believe that you can make this work using the Template field and layout script ...

  <asp:TemplateField> <ItemTemplate> <asp:Label Id="lblSubclassVal" runat="server" Text="<%# DataBinder.Eval(Container.DataItem, "SubClass.PropertyName")%>"></asp:Label> </ItemTemplate> </asp:TemplateField>
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The data binding engine behind ASP.NET GridView supports only one level binding. (unlike its comparison with binding to WinForms, which supports multilevel communication in the case of binding to DataSet / DataTable / DataView).

You have three possible solutions:

  • Handling an ItemDataBound event for each row
  • Extending root-level entities with properties that expose the properties of child objects and use these properties for binding expressions
  • Instead of using BoundField, you can use the Template field and generate content using the expression <% =%>, which refers to the data item.
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Mark

I am sure that 99.9% you will have to handle this in code in the ItemDataBound event for a single line.

Remember that you can get the whole databould object with e.Item.DataItem

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Syntax [Name]. [Name] is not supported by BoundField. Only simple property names.

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