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Filtering TreeViews

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Bra
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Bra asked on 08 Sep 2020, 01:17 PM

Hello,

I would like to filter a TreeView, but I can't find any solution for Xamarin.Forms. Is it possible or not ?

Thank you :)

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Lance | Manager Technical Support
Telerik team
answered on 08 Sep 2020, 01:31 PM

Hi Bra,

The RadTreeView doesn't use FilterDescriptors or internal data segregation. Therefore, you can use normal filtering with LINQ.

For example:

//---------------------Setup------------------------- //
// Keep a separate ObservableCollection for TreeView

ObservableCollection<Car> originalData = ...;
ObservableCollection<Car> tvData = new ObservableCollection<Car>();
MyTreeView.ItemsSource = tvData;

//---------------------All Items---------------------- //

// show all the items in the Treeview
foreach(var car in originalData)
   tvData.Add(car);

//-------------------Filtered Items---------------------- //

// Clear the previous list
tvData.Clear();

// filter out the items you want
var filteredCars = originalData.Where(i => i.Make == "Mercedes Benz");

// show them in the Treeview
foreach(var car in filteredCars) 
   tvData.Add(car);

 

Regards,
Lance | Manager Technical Support
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Bra
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answered on 09 Sep 2020, 06:55 AM

Hi,

 

OK, I will implement my own filter. Thank you for your answer and the little example :)

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Lance | Manager Technical Support
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Bra
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