Question

我有一个非常简单的WPF UserControl，如下所示：

namespace WpfControlLibrary1
{
  public partial class UserControl1 : UserControl
  {
    public UserControl1()
    {
      InitializeComponent();
      Composite = new Composite();
      Composite.Color = Colors.Red;
    }

    protected override void OnRender(DrawingContext drawingContext)
    {
      Draw(drawingContext, new Rect(RenderSize));
    }

    public void Draw(DrawingContext g, Rect rect)
    {
      Composite.Draw(g, rect);
    }

    public Composite Composite
    {
      get;
      set;
    }
  }

  public class Composite
  {
    public void Draw(DrawingContext g, Rect rect)
    {
      g.DrawRectangle(new SolidColorBrush(Color), new Pen(Brushes.Black, 1.0), rect);
    }

    public Color Color
    {
      get;
      set;
    }
  }
}

但是，当我尝试在UserControl所在的窗口的XAML中执行此操作时：

<Window x:Class="WpfApplication1.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:test="clr-namespace:WpfControlLibrary1;assembly=WpfControlLibrary1"
    Title="Window2" Height="500" Width="700">

  <test:UserControl1 Name="uControl1" Composite.Color="Blue">
  </test:UserControl1>
</Window>

我收到以下错误：

Error   1   The attachable property 'Color' was not found in type 'Composite'.
Error   2   The property 'Composite.Color' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation'.

必须有简单的方法让上述工作，但我担心我无法找到有关该主题的任何相关信息。任何人都可以给我一两个指针吗？

非常感谢！

Answer 1

语法Type.Property用于设置attached properties。试试这个：

<test:UserControl1 Name="whatever">
    <test:UserControl1.Composite>
        <test:Composite Color="Blue"/>
    </test:UserControl1.Composite>
</test:UserControl1>

System.Windows.Window的XAML中的自定义属性

1 个答案: