WPF 依赖属性不起作用

发布于 2024-10-05 23:16:51 字数 620 浏览 1 评论 0原文

我有一个自定义依赖属性，如下定义：

public static readonly DependencyProperty MyDependencyProperty =
DependencyProperty.Register(
"MyCustomProperty", typeof(string), typeof(MyClass));

    private string _myProperty;
    public string MyCustomProperty
    {
        get { return (string)GetValue(MyDependencyProperty); }
        set
        {
            SetValue(MyDependencyProperty, value);
        }
    }

现在我尝试在 XAML 中设置该属性，

<controls:TargetCatalogControl MyCustomProperty="Boo" />

但是 DependencyObject 中的 setter 永远不会被命中！尽管当我将属性更改为常规属性而不是 Dep Prop 时确实如此

原文

I have a custom Dependency Property defined like so:

public static readonly DependencyProperty MyDependencyProperty =
DependencyProperty.Register(
"MyCustomProperty", typeof(string), typeof(MyClass));

    private string _myProperty;
    public string MyCustomProperty
    {
        get { return (string)GetValue(MyDependencyProperty); }
        set
        {
            SetValue(MyDependencyProperty, value);
        }
    }

Now I try set that property in XAML

<controls:TargetCatalogControl MyCustomProperty="Boo" />

But the setter in DependencyObject never gets hit! Although it does when I change the property to be a regular property and not a Dep Prop

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断肠人 2024-10-12 23:16:51

试试这个..

    public string MyCustomProperty
    {
        get 
        { 
            return (string)GetValue(MyCustomPropertyProperty); 
        }
        set 
        { 
            SetValue(MyCustomPropertyProperty, value); 
        }
    }

    // Using a DependencyProperty as the backing store for MyCustomProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty MyCustomPropertyProperty =
        DependencyProperty.Register("MyCustomProperty", typeof(string), typeof(TargetCatalogControl), new UIPropertyMetadata(MyPropertyChangedHandler));


    public static void MyPropertyChangedHandler(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        // Get instance of current control from sender
        // and property value from e.NewValue

        // Set public property on TaregtCatalogControl, e.g.
        ((TargetCatalogControl)sender).LabelText = e.NewValue.ToString();
    }

    // Example public property of control
    public string LabelText
    {
        get { return label1.Content.ToString(); }
        set { label1.Content = value; }
    }

Try this..

    public string MyCustomProperty
    {
        get 
        { 
            return (string)GetValue(MyCustomPropertyProperty); 
        }
        set 
        { 
            SetValue(MyCustomPropertyProperty, value); 
        }
    }

    // Using a DependencyProperty as the backing store for MyCustomProperty.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty MyCustomPropertyProperty =
        DependencyProperty.Register("MyCustomProperty", typeof(string), typeof(TargetCatalogControl), new UIPropertyMetadata(MyPropertyChangedHandler));


    public static void MyPropertyChangedHandler(DependencyObject sender, DependencyPropertyChangedEventArgs e)
    {
        // Get instance of current control from sender
        // and property value from e.NewValue

        // Set public property on TaregtCatalogControl, e.g.
        ((TargetCatalogControl)sender).LabelText = e.NewValue.ToString();
    }

    // Example public property of control
    public string LabelText
    {
        get { return label1.Content.ToString(); }
        set { label1.Content = value; }
    }

回复收藏 0 原文

相思碎 2024-10-12 23:16:51

除非您手动调用它，否则不会。您可以将一个属性更改处理程序添加到 DependancyProperty 构造函数调用中，以便在属性更改时收到通知。

调用此构造函数：

http://msdn.microsoft.com/en-us/library /ms597502.aspx

使用此构造函数创建的 PropertyMetadata 实例：

http: //msdn.microsoft.com/en-us/library/ms557327.aspx

编辑：此外，您没有正确实现依赖属性。您的 get 和 set 应分别使用 GetValue 和 SetValue，并且您不应该有类成员来存储价值。 DP 的成员名称也应该是 {PropertyName}Property，例如 MyCustomPropertyProperty 如果 get/set 和注册的属性名称是MyCustomProperty。请参阅 http://msdn.microsoft.com/en-us/library/ms753358。 aspx 了解更多信息。

希望有帮助。