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Multiple DataKeys Null Conditional
Lets say you have multiple DataKeys assigned to the DataKeyNames property of the GridView control where only one DataKey will have a value and the rest will be null. Based on the non-null value, you want to trigger a conditional. I've discovered an easy to accomplish this is using Reflection and a GridView event. In this example, the value of my DataKeys are all of type integer.

VB.NET
Private Sub GridView_Created( ByVal sender As Object , ByVal e As GridViewRowEventArgs )
    If e.Row.RowType = DataControlRowType.DataRow Then
        Dim nKeyVal As Integer

        If g ridView.DataKeys(e.Row.RowIndex).Values( "K eyName1" ).GetType() == Type .GetType( "System.Int32 " ) Then
            nKeyVal =  g ridView .DataKeys(e.Row.RowIndex).Values ( "K eyName1" )

            ' Do something
        End If

        If g ridView.DataKeys(e.Row.RowIndex).Values ( "K eyName2" ).GetType() == Type .GetType( "System.Int32 " ) Then
            nKeyVal =  g ridView .DataKeys(e.Row.RowIndex).Values ( "K eyName2" )

            ' Do something
        End If

        If gridView.DataKeys(e.Row.RowIndex).Values ( "K eyName3" ).GetType() == Type .GetType( "System.Int32 " ) Then
            nKeyVal =  gridView .DataKeys(e.Row.RowIndex).Values( "K eyName3" )

            ' Do something
        End If
    End If
End Sub

C#
private void GridView_Created( object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        int nKeyVal;

        if ( g ridView.DataKeys[e.Row.RowIndex].Values[ "K eyName1" ].GetType() == Type .GetType( "System.Int32 " ))
        {
            nKeyVal = ( int ) g ridView .DataKeys[e.Row.RowIndex].Values[ "K eyName1" ];

            // Do something
        }

        if ( g ridView.DataKeys[e.Row.RowIndex].Values[ "K eyName2" ].GetType() == Type .GetType( "System.Int32 " ))
        {
            nKeyVal = ( int ) g ridView .DataKeys[e.Row.RowIndex].Values[ "K eyName2" ];

            // Do something
        }

        if (gridView.DataKeys[e.Row.RowIndex].Values[ "K eyName3" ].GetType() == Type .GetType( "System.Int32 " ))
        {
            nKeyVal = ( int ) gridView .DataKeys[e.Row.RowIndex].Values[ "K eyName3" ];

            // Do something
        }
    }
}

Note: gridView is the ID of the GridView control.

R
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Posted: Tuesday, December 06, 2005 9:53 AMby Ryan Olshan
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