Lookup a control in a GridTemplateColumn.EditTemplate

[Sam Chan]

Hi,

I have a GridTemplateColumn which contains custom controls in a CellTemplate and an EditTemplate. At runtime, how do I obtain a reference to the controls in the current cell in C#? I'm trying to do this in the CurrentCellBeginEdit handler so that I can setup the controls for editing. I tried to look them up in the visual tree based on the class and the x:Name but it always returns null. I suspect there must be multiple instances of the controls when using GridTemplateColumn so I have to lookup the ones associated with the current cell.

Regards,

Sam

[Jai Ganesh S]

Hi Sam, 

 

You can get the control inside the edit template of GridTemplateColumn by passing the control name like below,  

private async void Sfdatagrid_CurrentCellBeginEdit(object sender, CurrentCellBeginEditEventArgs e) 

{ 

    await this.Dispatcher.BeginInvoke(new Action(() => 

    { 

    int recordIndex = this.sfdatagrid.ResolveToRecordIndex(e.RowColumnIndex.RowIndex); 

 

    var rowGenerator = this.sfdatagrid.GetRowGenerator() as RowGenerator; 

             

        var columnElement= this.sfdatagrid.SelectionController.CurrentCellManager.CurrentCell.ColumnElement as GridCell; 

 

        var rowData = columnElement.DataContext; 

 

        var dataColumn = columnElement.ColumnBase as DataColumn; 

                 

 

        if (dataColumn.Renderer.GetType() == typeof(GridCellTemplateRenderer) && dataColumn.GridColumn.MappingName=="EmployeeId") 

        { 

                    

            DataTemplate dataTemplate = null; 

            ComboBox comboBox = null; 

            ContentPresenter contentPresenter = this.FindVisualChild<ContentPresenter>(columnElement); 

 

            dataTemplate = contentPresenter.ContentTemplateSelector.SelectTemplate(rowData, contentPresenter); 

            comboBox = (ComboBox)dataTemplate.FindName("combobox", contentPresenter); 

                             

        } 

 

                 

    }), System.Windows.Threading.DispatcherPriority.ApplicationIdle); 

} 

 

Sample: https://www.syncfusion.com/downloads/support/directtrac/general/ze/WPF-1449676857.zip 

 

In the above sample, we have loaded the Combobox inside the EditTemplate of EmployeeId column and you can get it by using the CurrentCellBeginEdit event, 

 

Regards, 

Jai Ganesh S 

[Sam Chan]

Thank you Jai,

I was able to adapt your sample code to achieve what I wanted to do. I'm glad that I asked the question instead of spending more time trying to figure it out myself because the solution is not that trivial. I would have never thought it needed to be done in a Dispatcher.

Regards,

Sam

[Muthukumar Kalyanasundaram]

Hi Sam, 

 

Thanks for the update. Please let us know if you need any other assistance. 

 

Regards, 

Muthukumar K