wpf DependencyProperty不接受默认值

Question

我试图在我的代码中使用tis depencency属性,但它给我错误说默认值类型与属性'MyProperty'的类型不匹配.但是short应该接受0作为默认值.

如果我尝试将其作为默认值赋予它,则它可以工作,即使它是非nullabel类型.怎么会发生这种情况..

public short MyProperty
{
   get { return (short)GetValue(MyPropertyProperty); }
   set { SetValue(MyPropertyProperty, value); }
}

使用DependencyProperty作为MyProperty的后备存储.这可以实现动画,样式,装订等......

public static readonly DependencyProperty MyPropertyProperty =
    DependencyProperty.Register(
        "MyProperty",
        typeof(short),
        typeof(Window2),
        new UIPropertyMetadata(0)
    );

Answer 1

问题是C#编译器将文字值解释为整数.您可以告诉它将它们解析为long或ulongs(40L是长的,40UL是ulong),但是没有简单的方法来声明short.

简单地转换文字将起作用:

public short MyProperty
{
    get { return (short)GetValue(MyPropertyProperty); }
    set { SetValue(MyPropertyProperty, value); }
}

public static readonly DependencyProperty MyPropertyProperty = 
   DependencyProperty.Register(
      "MyProperty", 
      typeof(short),
      typeof(Window2),
      new UIPropertyMetadata((short)0)
   );