c# - 自定义控件的 WPF 依赖属性

Question

我对如何设置自定义控件的依赖属性有点困惑。

我创建了自定义控件，因此它派生自 Control 类。

public class CustControl : Control 
    {
      static CustControl()
       {
         DefaultStyleKeyProperty.OverrideMetadata(typeof(CustControl), new FrameworkPropertyMetadata(typeof(CustControl)));       
       }        
    }

为了设置依赖属性，我必须将其注册到必须从 DependencyObject 派生的类中。所以它应该是另一个类:

class CustClass : DependencyObject
{
    public readonly static DependencyProperty MyFirstProperty = DependencyProperty.Register("MyFirst", typeof(string), typeof(CustControl), new PropertyMetadata(""));

    public string MyFirst
    {
        get { return (string)GetValue(MyFirstProperty); }
        set { SetValue(MyFirstProperty, value); }
    }
}

现在我如何将 MyFirst 属性设置为 CustControl 的依赖属性？

Answer 1

In order to set Dependency Property I have to register it inside a class which must be derived from DependencyObject. So it should be another class:

不，不应该。 Control 已派生自 DependencyObject。由于继承是 transitive ，这使得 CustControl 也成为 DependencyObject 的子类型。只需将其全部放入 CustControl 中即可:

public class CustControl : Control 
{
      static CustControl()
      {
          DefaultStyleKeyProperty.OverrideMetadata(typeof(CustControl), new FrameworkPropertyMetadata(typeof(CustControl)));       
      }        

    public readonly static DependencyProperty MyFirstProperty = DependencyProperty.Register("MyFirst", typeof(string), typeof(CustControl), new PropertyMetadata(""));

    public string MyFirst
    {
        get { return (string)GetValue(MyFirstProperty); }
        set { SetValue(MyFirstProperty, value); }
    }
}