TreeView Getting Started

[Nicola]

Hi everybody. Im following the getting started guide here (https://docs.telerik.com/devtools/xamarin/controls/treeview/treeview-getting-started). I have a few question: First of all I need to create the class Item and ViewModel in the general folder of the project?

Then when I arrived at this step:

<telerikDataControls:RadTreeView x:Name="treeView" ItemsSource="{Binding Source}"><telerikDataControls:TreeViewDescriptor DisplayMemberPath="Name"ItemsSourcePath="Children"TargetType="{x:Type local:Item}" /></telerikDataControls:RadTreeView>

If I copy this inside my project and then compile I get this error: "Type Item not found in xmlns" at row 13 that is this line here TargetType="{x:Type local:Item}
What am I doing wrong?

I just want to put a treeview in the app but Im not able. I tried to create the classes under UWP files, I moved all down there, delete from the main Shared part of the project but nothing.
Images attached :D
Thank you

 

 

[Yana]

Hi Nicola,

Thank you for your interest in RadTreeView for Xamarin.

In the example "local" refers to the namespace where Item class is placed - it is not specified as it can be different for different projects.

For example, if Item class is defined like this:

using System.Collections.Generic;
using System.Collections.ObjectModel;

namespace GettingStartedExample
{
    public class Item
    { 
        public Item(string name)
        {
            this.Name = name;
            this.Children = new ObservableCollection<Item>();
        }

        public string Name { get; set; }
        public IList<Item> Children { get; set; }
    }
}

then in order to reference it like this:

<telerikDataControls:RadTreeView x:Name="treeView" ItemsSource="{Binding Source}">
            <telerikDataControls:TreeViewDescriptor DisplayMemberPath="Name"
                                                    ItemsSourcePath="Children"
                                                    TargetType="{x:Type local:Item}" />
</telerikDataControls:RadTreeView>

You would need to add the namespace to the ContentPage/ContentView:

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:telerikDataControls="clr-namespace:Telerik.XamarinForms.DataControls;assembly=Telerik.XamarinForms.DataControls"
             xmlns:local="clr-namespace:GettingStartedExample"
             x:Class="GettingStartedExample.TreeViewGettingStartedXaml">

You can find the complete RadTreeView GettingStarted example in our SDKBrowser example github repo, here is the direct link:

https://github.com/telerik/xamarin-forms-sdk/tree/master/XamarinSDK/SDKBrowser/SDKBrowser/Examples/TreeViewControl/GettingStartedCategory/GettingStartedExample

I hope I was of help. Let me know if you have any additional questions or concerns.

Regards,
Yana
Progress Telerik

[Nicola]

Super helpful. Thank you so much!