Debugging GridView / ObjectDataSource events

Question

Ahoy!

I am using an ASP.NET GridView control bound to an ObjectDataSource:

<asp:ObjectDataSource ID="Things" runat="server"
    TypeName="BLL.Thing"
    UpdateMethod="UpdateThing"
    OnUpdating="Things_Updating"
    OnUpdated="Things_Updated">
    <UpdateParameters>
        <asp:SessionParameter
            Name="userContext"
            SessionField="UserContext"
            Type="Object" />
        <asp:Parameter Name="thing" Type="Object" />
    </UpdateParameters>
</asp:ObjectDataSource>

Clicking on an ImageButton control with CommandName="Update" causes the specified OnUpdating event to occur, but not the specified UpdateMethod or the OnUpdated event.

<EditItemTemplate>
    <asp:ImageButton ID="ImageButton_Save" runat="server"
        CommandName="Update"
        SkinID="Save"
        CausesValidation="false"
        CommandArgument='<%# Eval("Id") %>' />
    <asp:ImageButton ID="ImageButton_Cancel" runat="server"
        CommandName="Cancel"
        SkinID="Cancel"
        CausesValidation="false" />
</EditItemTemplate>

The input parameters are defined in the OnUpdating event like so:

protected void Things_Updating(object sender, ObjectDataSourceMethodEventArgs e)
{
    e.InputParameters["thing"] = _theThing;
}

No exception is thrown. The page just posts back with the EditItemTemplate controls still showing. I can put breakpoints all over the place, but the trail stops at the end of Things_Updating. It seems that some exception is happening which is not handled or caught by the debugger. Is there a way to open the hood and see what ASP.NET is doing (or failing to do)?

Thanks in advance!

Answer 1

Does BLL.Thing.UpdateThing() execute? This should occur after Things.Updating and be easily debug-able. Also if there is something causing an exception, that is probably it.

Edit:

Try adding the parameter in a handler for GridView.RowUpdating instead of ObjectDataSource.Updating. That is how I usually do it. I think you need to get the DataSourceView to modify the update parameters in the ObjectDataSource's event. (See: ObjectDataSource Gridview Insert Fails W/ Empty Values Dictionary)

protected void gridThings_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    e.NewValues.Add("thing", _theThing);
}

Answer 2

Two things come to mind that could cause the progress to stop right there:

1. You've handled he GridView.RowUpdating event as well, and set the GridViewUpdateEventArgs.Cancel property to true. Something like this:

   protected void myGridView_RowUpdating(Object sender, GridViewUpdateEventArgs e)
   {
       e.Cancel = true;
   }
   

2. You've done something similar in the ObjectDataSource.Updating event, setting the ObjectDataSourceMethodEventArgs.Cancel property to false. Like this:

   private void myObjectDataSource_Updating(object source, ObjectDataSourceMethodEventArgs e)
   {
       e.Cancel = true;
   }
   

Either of these will halt the update process, causing something like what you're describing.