Not Working: MasterTableView.GetItems(GridItemType.Header)

[Mehdi]

The function is returning no items. Following is a copy of my markup and code:

protected void Page_Load(object sender, EventArgs e)

{

    RadGrid1.DataSource = GetDataSource();

    RadGrid1.DataBind();

}

 

private DataTable GetDataSource()

{

    ...


}

 

private void AddGroupHeadersToGrid()

{

    GridItem[] header = RadGrid1.MasterTableView.GetItems(GridItemType.Header);

    //GridTHead head = ((GridTHead)header[0].Parent.Controls[0].Parent);

 

    GridHeaderItem newHeaderItem = new GridHeaderItem(RadGrid1.MasterTableView, 0, 0);

    newHeaderItem.Cells.Add(new GridTableHeaderCell());

    newHeaderItem.Cells[0].Text = "I'm a header.";

 

    //head.Controls.AddAt(0, newHeaderItem);

}

protected void RadGrid1_PreRender(object sender, EventArgs e)

{

    AddGroupHeadersToGrid();

}

The markup looks like this:

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false"
    onprerender="RadGrid1_PreRender">
    <MasterTableView>
        <Columns>
            <telerik:GridBoundColumn HeaderText="Question" DataField="Question" UniqueName="Question">
            </telerik:GridBoundColumn>

            <telerik:GridBoundColumn HeaderText="Score" DataField="MTDScore" UniqueName="MTDScore">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn HeaderText="Area" DataField="MTDArea" UniqueName="MTDArea">

            <telerik:GridBoundColumn HeaderText="Score" DataField="QTDScore" UniqueName="QTDScore">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn HeaderText="Area" DataField="QTDArea" UniqueName="QTDArea">

            <telerik:GridBoundColumn HeaderText="Score" DataField="YTDScore" UniqueName="YTDScore">
            </telerik:GridBoundColumn>
            <telerik:GridBoundColumn HeaderText="Area" DataField="YTDArea" UniqueName="YTDArea">
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

I would really appreciate if somebody can tell me what I'm doing wrong here!

[Princy]

Hello Mehdi,

Here is the sample code that I tried to access HeaderItem in PreRender event which worked as expected.

C#:

protected  void RadGrid1_PreRender(object sender, EventArgs e)
{
  GridHeaderItem hitem = (GridHeaderItem)RadGrid1.MasterTableView.GetItems(GridItemType.Header)[0];
}

Thanks,
Princy.

[Mehdi]

Thanks for your reply princy.

I tried doing the same in a new project using the line you mentioned and it worked. I must be doing something wrong in my other project, then.

Thanks again,
Mehdi

EDIT: I just got the issue. My GetDataSource function wasn't returning anything. And I spent 3 hours on this issue!

[Renee]

How do you do this for a detail table?  This code: 

GridHeaderItem headerItem = (GridHeaderItem)AppsGrid.MasterTableView.DetailTables[0].GetItems(GridItemType.Header)[0];

returns an index out of bounds error.

[Princy]

Hi Renee,

Please try the following code snippet to access the detail table header.

C#:

protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)
{
 if ((e.Item is GridHeaderItem) && (e.Item.OwnerTableView.Name == "DetailTableName"))
  {
    GridHeaderItem header = (GridHeaderItem)e.Item;
    LinkButton button = header["UniqueName"].Controls[0] as LinkButton;
    button.Text = "Customized HeaderText";
  }
}

Thanks,
Princy