自定义控件依赖项属性绑定 [英] Custom Control Dependency Property Binding

问题描述

即使是最基本的示例，我也会发疯。我一生无法束缚工作。这是一个超级简单的示例，对我不起作用。我必须做某件事不正确。

I am going insane trying to get this to work with even the most basic example. I cannot for the life of me get binding to work. Here is a super easy example that is not working for me. I MUST be doing something incorrect.

我在控件库程序集中的自定义控件：

My Custom Control in my control library assembly:

public class TestControl : Control
{
    public static readonly DependencyProperty TestPropProperty =
        DependencyProperty.Register("TestProp", typeof(string), typeof(TestControl), new UIPropertyMetadata(null));

    public string TestProp
    {
        get { return (string)GetValue(TestPropProperty); }
        set { SetValue(TestPropProperty, value); }
    }

    static TestControl()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(TestControl), new FrameworkPropertyMetadata(typeof(TestControl)));
    }
}

及其XAML模板：

<Style TargetType="{x:Type local:TestControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:TestControl}">
                <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                    <StackPanel>
                        <TextBlock Text="Testing..." />
                        <Label Content="{Binding TestProp}" Padding="10" />
                    </StackPanel>
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

以下是在WPF窗口中使用控件的XAML，其中引用了我的控件库：

Here's the XAML consuming the control in a wpf window with a reference to my control library:

<Grid>
    <ItemsControl Name="mylist">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <my:TestControl TestProp="{Binding Path=Name}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</Grid>

这是后面的代码：

public partial class Test2 : Window
{
    public class TestObject : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string PropertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));
        }

        private int _id;
        public int id
        {
            get { return _id; }
            set { _id = value; OnPropertyChanged("id"); }
        }

        private string _Name;
        public string Name
        {
            get { return _Name; }
            set { _Name = value; OnPropertyChanged("Name"); }
        }
    }

    public Test2()
    {
        InitializeComponent();

        mylist.ItemsSource = new TestObject[]
        {
            new TestObject(){ id = 1, Name = "Tedd" },
            new TestObject(){ id = 2, Name = "Fred" },
            new TestObject(){ id = 3, Name = "Jim" },
            new TestObject(){ id = 4, Name = "Jack" },
        };
    }
}

运行此示例将为我提供四个控件实例，但是我只看到每个文本框上的 Testing ... TextBlock。我的标签从未绑定。我的误解是什么？做错了吗？

Running this example gives me four instances of the control, however I only see the "Testing..." TextBlock on each. My label is never bound. What am I misunderstanding and doing incorrectly?

推荐答案

您没有设置正确的绑定源。您要么必须设置 RelativeSource ：

You haven't set the proper binding source. You would either have to set RelativeSource:

<Label Content="{Binding TestProp, RelativeSource={RelativeSource Mode=TemplatedParent}}" />

或使用模板绑定：

<Label Content="{TemplateBinding TestProp}"/>

这篇关于自定义控件依赖项属性绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！