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!

score 2 · Accepted Answer · edited May 23 '17 at 12:03

2

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);
}

edited May 23 '17 at 12:03

Community

1
1

answered Dec 19 '11 at 21:00

pseudocoder

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Nope, the trail mysteriously ends after Things_Updating :-/ – Adam Dec 19 '11 at 21:04
I don't think the GridView class has an OnUpdating event, but it does have a RowCommand event which I will use instead. Thanks! – Adam Dec 20 '11 at 20:06
@Adam My mistake, I meant to reference `GridView.RowUpdating`. Thanks for the accept! – pseudocoder Dec 21 '11 at 16:21

score 1 · Answer 2 · answered Dec 20 '11 at 14:39

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

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;
}
```
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.

Thanks, partner. I have conditional logic that sets e.Cancel to true in certain circumstances, but they aren't being hit. I'm going to give up on this approach and use my own method in the RowCommand event instead. — Adam, Dec 20 '11 at 20:04

Debugging GridView / ObjectDataSource events

2 Answers2