绑定到 UserControl 中的属性

发布于 2024-10-26 17:53:28 字数 751 浏览 4 评论 0原文

我有一个用户控件，我想在其中公开一个名为 ExpressionText 的属性，并在 xaml 可以为此属性定义绑定。所以我创建了一个依赖属性

public static readonly DependencyProperty EditorText =DependencyProperty.Register("EditorText", typeof(string), typeof(MyUerControl));

，并

public string ExpressionText 
{
    get
    {
        return (string)GetValue(EditorText);
    }
    set
    {
        SetValue(EditorText, value);
    }
}

在 xaml 中执行此操作。

     <controls:MyUerControl x:Name="textEditor" ExpressionText="{Binding 
                                  Path=Expression,Mode=TwoWay}" />

但我得到

A绑定无法在 MyUserControl 类型的 ExpressionText 属性上设置。可设置绑定仅在依赖对象类型错误的依赖属性上。

我的方法有问题吗？我该如何解决这个问题？

原文

I have a usercontrol in which i want to expose a property called ExpressionText and in the
xaml a binding can be defined to this property.
So i created a dependency property

public static readonly DependencyProperty EditorText =DependencyProperty.Register("EditorText", typeof(string), typeof(MyUerControl));

and

public string ExpressionText 
{
    get
    {
        return (string)GetValue(EditorText);
    }
    set
    {
        SetValue(EditorText, value);
    }
}

in the xaml i do this.

     <controls:MyUerControl x:Name="textEditor" ExpressionText="{Binding 
                                  Path=Expression,Mode=TwoWay}" />

but i get

A binding cannot be set on ExpressionText property of type MyUserControl. Binding can be set
only on a depenedecy property of type Dependency object error.

Is there something wrong in my approach ? How do i solve this problem ?

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慈悲佛祖 2024-11-02 17:53:28

这应该有效：

public static DependencyProperty EditorTextProperty = DependencyProperty.Register("ExpressionText", typeof(string), typeof(MyUserControl),
          new PropertyMetadata(new PropertyChangedCallback((s, e) =>
          { })));
public string ExpressionText
{
    get
    {
        return (string)base.GetValue(EditorTextProperty);
    }
    set
    {
        base.SetValue(EditorTextProperty, value);
    }
}

This should work:

public static DependencyProperty EditorTextProperty = DependencyProperty.Register("ExpressionText", typeof(string), typeof(MyUserControl),
          new PropertyMetadata(new PropertyChangedCallback((s, e) =>
          { })));
public string ExpressionText
{
    get
    {
        return (string)base.GetValue(EditorTextProperty);
    }
    set
    {
        base.SetValue(EditorTextProperty, value);
    }
}

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愁以何悠 2024-11-02 17:53:28

您将 EditorText 定义为 DependencyProperty 的名称。这是可供您公开绑定的名称。如果您希望将其命名为 ExpressionText，则需要将其注册为名称。

   public static readonly DependencyProperty EditorText =
                           DependencyProperty.Register("ExpressionText", typeof(string), typeof(MyUerControl));

You are defining EditorText as the name of your DependencyProperty. That is the name that is available publicly for you to bind to. If you want it to be called ExpressionText, then you need to register that as the name.

   public static readonly DependencyProperty EditorText =
                           DependencyProperty.Register("ExpressionText", typeof(string), typeof(MyUerControl));

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