Hi,
how can I use the FilterPopUp if I set ShowColumnHeaders="false"?
I have a seperate filter icon which call this code behind:
MyGridView.ChildrenOfType<FilteringDropDown>().First().IsDropDownOpen = true;
With ShowColumnHeaders="true" I can open the FilterPopUp by clicking my icon or the build in filter icon. If I set ShowColumnHeaders="false" I'll get a System.InvalidOperationException: 'Sequence contains no elements' exception.
2 Answers, 1 is accepted
Hello Kevin,
This ticket seems to be a duplicate of another one you already post. We have already answered to your questions in the other thread.
Regards,
Dinko
Progress Telerik
Hello Kevin,
I am sharing the solution here, as the community can take advantage of it.
To get the FilteringDropDown controls inside the header cells, we can subscribe to the Loaded event of the RadGridView. Inside the event handler, we can get the desired elements using the ChildrenOfType<T>() wrapped inside a Dispatcher.
It turns out that in some cases when the column headers are hidden (ShowColumnHeaders="False"), the FilteringDropDown controls inside the header cells are not loaded. Therefore the ChildrenOfType<T>() returns no sequences. To workaround this behavior we can hide the column headers after our custom logic. The following code snippet demonstrate this.
private void PlaceholdersGridView_Loaded(object sender, RoutedEventArgs e)
{
Dispatcher.BeginInvoke((Action)(() =>
{
if (this.PlaceholdersGridView.ChildrenOfType<FilteringDropDown>().Count() > 0)
{
FirstFilteringDropDown = this.PlaceholdersGridView.ChildrenOfType<FilteringDropDown>().First();
this.PlaceholdersGridView.ShowColumnHeaders = false;
}
}), DispatcherPriority.ApplicationIdle);
}Regards,
Dinko
Progress Telerik