Cannot cast DataItem to DataRowView in Custom Binding Scenario

Question

I have an object that returns an IList which I'm getting from my ObjectDataSource and binding to a Gridview. All works fine if I just use standard binding, but I'm trying to customize my binding to set properties on a linkbutton as follows:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                //  extract the link button
                LinkButton lnkViewMap = (LinkButton)e.Row.FindControl("lnkViewMap");

                //  grab the datarowview
               System.Data.DataRowView row = (System.Data.DataRowView)e.Row.DataItem;

                //  set the onclientclick to fire our showMap javascript function,
                //  passing through the lat/longs
                lnkViewMap.OnClientClick = string.Format("showMap({0}, {1}); return false;", row["Lat"], row["Long"]);
            }
        }

My error occurs where I am casting the e.Row.DataItem to a DataRowView. The code above is from Matt Berseth's awesome blog on Virtual Earth...which is what I am trying to implement here. Any ideas?

Answer 1

Set a breakpoint in the debugger and see what type e.Row.DataItem actually is.

It would only be a DataRowView if the DataSource you are setting on the grid is a DataView or DataTable. Otherwise it would be the element type of the collection.