Xamarin DataBinding到bindableProperty（CustomView）

Question

i made a custom view which displays a text.

in TestView.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentView 
    xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="EodiRoad.TestView">
    <StackLayout>

        <Label Text="{Binding Test}"/>
        <Label Text="this is test view"/>

    </StackLayout>
</ContentView>

and the codebehind

in TestView.xaml.cs

    public partial class TestView : ContentView
    {


        public static BindableProperty TestProperty =
            BindableProperty.Create(
                propertyName: "Test",
                returnType: typeof(string),
                declaringType: typeof(TestView),
                defaultValue:"???"
            );

        public string Test
        {
            get
            { return (string)GetValue(TestProperty); }
            set
            {
                Debug.WriteLine("test setted value = " + (string)value);
                SetValue(TestProperty, value); 
            }
        }



        public TestView()
        {
            InitializeComponent();
            BindingContext = this;
        }
    }

and when i use this is some other page like this

<local:TestView Test="hjhkhjk"/>

it would work just fine. But when i bind a data to it

<local:TestView Test="{Binding post.uploader.username}"/>

then it wont desplay anything...

its not a problem that post.uploader.username value is wrong or some that kind of thing. because

<Label Text="{Binding post.uploader.username}"/>

i have this code right under that malfunctioning line and it just works fine too..

what am i doing wrong here? how to fix it ..?

Answer 1

You can make binding only from BindableObject property object in your TestView class. For example, if you will write next code:

<local:TestView Test="{Binding post.uploader.username}" />

Your BindableObject object must have post property object, which has uploader property object, which has username property string