[Solved] Problem item type with GridCalculatedColumn

[VANDENBERGHE]

Hi everyone,

I found an issue with the RadGrid Component. If I add a GridCalculatedColumn to the RadGrid, I can't write the sample of code you could find below anymore. In fact, e.Item.DataItem belongs to type DynamicCalss1 (see in debugger) but I can't use it for accessing to the methods of the Item.

protected void gridViewCtrl_ItemDataBound(object sender, Telerik.Web.UI.GridItemEventArgs e)
{
     if (e.Item.ItemType == Telerik.Web.UI.GridItemType.Item ||
          e.Item.ItemType == Telerik.Web.UI.GridItemType.AlternatingItem)
     {
          ProductDataContract prod = e.Item.DataItem as ProductDataContract;
          prod.DoSomething();
     }
}

The only workaround I found is to not use this type of column, but it is really unconfortable to not use it.

I'm pretty sure there is another solution, so I will be very happy if you could help me.

Thanks.

[Princy]

Hi,

Try accessing the GridCalculatedColumn's cell value using the ColumnUniqueName property as shown below.

ASPX:

<telerik:GridCalculatedColumn UniqueName="CalCol" HeaderText="CalCol" DataFields=" SupplierID, ProductID"  Expression="{0}*{1}" ></telerik:GridCalculatedColumn>

CS:

  protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridDataItem)
        {
            GridDataItem item = (GridDataItem)e.Item;
            string strtxt = item["CalCol"].Text.ToString();

        }
    }

Thanks
Princy.

[VANDENBERGHE]

Thanks for your quick answer,

My problem is not accessing to the column, but really retrieve the DataItem in is real type. I want to execute its own method. I don't understand why the DataItem type is modified at run time and how I can cast it to retrieve the good one.

The cast works well with all other column type. I have just found this issue when I added a GridCalculatedColumn to the RadGrid.

Regards.

[VANDENBERGHE]

Perhaps you can just explain me why item type is changed ?

[Rosen]

Hello VANDENBERGHE,

You probably know that RadGrid for ASP.NET AJAX use internally LINQ to objects. Therefore, when calculated column is used, a dynamic class is necessary to be used as the property to store the calculated column values is needed.
To avoid that if you prefer, you can disable the internal LINQ functionality by setting the EnableLinqExpressions property of the grid to false.

Best regards,
Rosen
the Telerik team

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