How to check the existence of a column

[François]

Hi every body.

I don't find how to determine if a column with a specific UniqueName exists in a ItemDataBound. My example here:

TableCell oCellStatus = null;
try
{
  oCellStatus = oGridDataItem["StatusColumn"];
}
catch
{
  oCellStatus = null;
}
if (oCellStatus != null)
{
  Image oImageStatus = new Image();
  oImageStatus.ImageUrl = String.Format("~/App_Themes/{0}/Images/{1}", this.Page.Theme, "Status-" + oCellStatus.Text + ".png");
  oCellStatus.Controls.Add(oImageStatus);
}

You see that I use a try catch to determine if a specific column exists in my GridDataItem. I don't find a Exists(UniqueName) or collections to loop all columns. Is there a solution to this specific question ?

[Missing User]

Hello François,


Please find attached a sample web application that demonstrates the needed approach.

Best wishes,
Plamen
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[François]

In fact, I can't use RadGrid object because my code is in code behind of a masterpage which loop all controls. And when it find a RadGrid, it add a ItemDataBound event which manipulate row. This allow my application to define status image for all DataGrid in content.
So, with GridDataItem, can I loop all columns with its UniqueName ?

[Missing User]

Hi François,


You can use the "sender" argument to obtain the Grid. Here is an example:

    protected void RadGrid1_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
    {
        RadGrid radGrid = (RadGrid)sender;
    }

Greetings,
Plamen
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.

[François]

Thanks ...
I'm confuse, ridiculous, dizzy ...

[Missing User]

Hi François,

I apologize for the confusion.

I created for you two simple pages which demonstrate two approaches to accomplish your task. Please, find them attached.

Default.aspx: The first approach is to use the FindByUniqueNameSafe method. The FindByUniqueNameSafe(columnName) performs the same task as GetColumnSafe(columnName) method. Here is an example:

            Object MyColumnName =
                radGrid.MasterTableView.Columns.FindByUniqueNameSafe("MyColumnName");

            if (MyColumnName != null)
                //MyColumnName column exists

Default1.aspx: Another approach would be to use the RenderColumns collection. The RadGrid1.MasterTableView.RenderColumns collection gives you access to all columns in the RadGrid - you can use it to iterate through all columns.

        if (e.Item is GridDataItem)
            foreach (GridColumn gridColumn in radGrid.MasterTableView.RenderColumns)
                Response.Write("<br />" + gridColumn.UniqueName);

Let me know if that helps.

Greetings,
Plamen
the Telerik team

Check out Telerik Trainer, the state of the art learning tool for Telerik products.