Question

I am trying to use some C# code that expands on the GridView functionality in a VB.NET project. The code I’m using is from here.

In the C# code there is an event definition for GroupHeader:

/// <summary>
/// Event triggered after a row for group header be inserted
/// </summary>
public event GroupEvent GroupHeader;

This is expanded by example on the above web site:

protected void Page_Load(object sender, EventArgs e)
{
    GridViewHelper helper = new GridViewHelper(this.GridView1);
    helper.RegisterGroup("ShipRegion", true, true);
    helper.RegisterGroup("ShipName", true, true);
    helper.GroupHeader += new GroupEvent(helper_GroupHeader);
    helper.ApplyGroupSort();
}

private void helper_GroupHeader(string groupName, object[] values, GridViewRow row)
{
    if (groupName == "ShipRegion")
    {
        row.BackColor = Color.LightGray;
        row.Cells[0].Text = "  " + row.Cells[0].Text;
    }
    else if (groupName == "ShipName")
    {
        row.BackColor = Color.FromArgb(236, 236, 236);
        row.Cells[0].Text = "     " + row.Cells[0].Text;
    }
}

My question is, how do I convert this code to VB.NET?

I have converted the event implementation like so:

Private Sub helper_GroupHeader(ByVal groupName As String, ByVal values As Object(), ByVal row As GridViewRow)
    Try
        If groupName = "ITEM#" Then
            row.BackColor = Color.LightBlue
            row.Cells(0).Text = "  " & row.Cells(0).Text
        End If
    Catch ex As Exception

    End Try
End Sub

How can I then call (raise?) this event with VB.NET?

Answer 1

You’re looking for AddHandler:

Protected Sub Page_Load(sender As Object, e As EventArgs)
    Dim helper As New GridViewHelper(Me.GridView1)
    helper.RegisterGroup("ShipRegion", True, True)
    helper.RegisterGroup("ShipName", True, True)
    AddHandler helper.GroupHeader, AddressOf helper_GroupHeader
    helper.ApplyGroupSort()
End Sub

I assume that the event is implicitely raised from GridViewHelper.