FireCommandEvent fires NullReferenceException

[Yazid]

Hi,

i try to perform filter operation programmatically. So i created an asp button and attached a server side click event handler. The filter operation should be fired in the event handler:

 protected void Filter_Click(object sender, EventArgs e)
 {
            RadGrid grd = grid;
            grid.MasterTableView.FilterExpression = "([Capture] LIKE 'Kind%')"; // Capture is the id and unique name of a GridBoundColumn
            GridColumn column = grid.MasterTableView.GetColumnSafe("Capture");
            column.CurrentFilterFunction = GridKnownFunction.Contains;
            column.CurrentFilterValue = "Kind";
            grd.EnableLinqExpressions = false;
            GridDataItem item = (grid.MasterTableView.GetItems(GridItemType.Item)[2] as GridDataItem);
            item.FireCommandEvent("Filter", new System.Web.UI.Pair("Kind", "Capture")); // exception is being fired at this line
            grid.Rebind();
}

 

This code causes an exception:

 

An exception of type 'System.NullReferenceException' occurred in Telerik.Web.UI.dll but was not handled in user code


   at Telerik.Web.UI.GridColumn.RefreshCurrentFilterValue(GridFilteringItem filteringItem, String functionName)
   at Telerik.Web.UI.GridFilterCommandEventArgs.ExecuteCommand(Object source)
   at Telerik.Web.UI.RadGrid.OnBubbleEvent(Object source, EventArgs e)
   at System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args)
   at Telerik.Web.UI.GridItem.OnBubbleEvent(Object source, EventArgs e)
   at Lusd.Presentation.LusdApplication.UserControls.Schule.InstitutionsListeControl.Filter_Click(Object sender, EventArgs e) in C:\TFS\ZeGOV\LUSD\Client\development\standard\Presentation\Presentation.LusdApplication\UserControls\Schule\InstitutionsListeControl.ascx.cs:line 429
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

How can I get it fixed?

 

Thanks in advance

[Viktor Tachev]

Hello Yazid,

Please try to use the approach described in the article below in order to filter the RadGrid from an external button. Give the approach a try and see how it works for you.

• http://www.telerik.com/forums/filter-radgrid-on-button-click

Regards,
Viktor Tachev
Telerik by Progress

[Yazid]

Thank you very much.

I found also another solution:

protected void Filter_Click(object sender, EventArgs e)
        {

            grid.MasterTableView.FilterExpression = "([Institution] LIKE \'Hasen%\')";
            GridColumn column = grid.MasterTableView.GetColumnSafe("Institution");
            column.CurrentFilterFunction = GridKnownFunction.Contains;
            column.CurrentFilterValue = "Hasen";
            grid.EnableLinqExpressions = false;
            GridFilteringItem filterItem = grid.MasterTableView.GetItems(GridItemType.FilteringItem)[0] as GridFilteringItem;
            filterItem.FireCommandEvent("Filter", new System.Web.UI.Pair("Contains", "Capture"));
        }