样品拖放行为的代码不工作

Question

这是行为的复制从WPF的教程页粘贴：

public class DragBehavior : Behavior<UIElement> 
{ 
    private Point elementStartPosition; 
    private Point mouseStartPosition; 
    private TranslateTransform transform = new TranslateTransform(); 

    protected override void OnAttached() 
    { 
     Window parent = Application.Current.MainWindow; 
     AssociatedObject.RenderTransform = transform; 

     AssociatedObject.MouseLeftButtonDown += (sender, e) => 
     { 
      elementStartPosition = AssociatedObject.TranslatePoint(new Point(), parent); 
      mouseStartPosition = e.GetPosition(parent); 
      AssociatedObject.CaptureMouse(); 
     }; 

     AssociatedObject.MouseLeftButtonUp += (sender, e) => 
     { 
      AssociatedObject.ReleaseMouseCapture(); 
     }; 

     AssociatedObject.MouseMove += (sender, e) => 
     { 
      Vector diff = e.GetPosition(parent) - mouseStartPosition; 
      if (AssociatedObject.IsMouseCaptured) 
      { 
       transform.X = diff.X; 
       transform.Y = diff.Y; 
      } 
     }; 
    } 
} 

这是我的测试页面：

<Page x:Class="WPFApp.Pages.BehaviorPage" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:local="clr-namespace:WPFApp.Pages" 
     xmlns:b="clr-namespace:WPFApp.Behaviors" 
     mc:Ignorable="d" 
     d:DesignHeight="300" d:DesignWidth="300" 
     Title="BehaviorPage"> 

    <Grid> 
     <StackPanel > 
      <Border Background="LightBlue"> 
       <d:Interaction.Behaviors> 
        <b:DragBehavior/> 
       </d:Interaction.Behaviors> 

       <TextBlock Text="Drag me around!" Width="110" FontSize="14"/> 
      </Border> 
     </StackPanel> 
    </Grid> 
</Page> 

时，我想调试“OnAttached （）'永远不会被打/叫。所以拖动&拖放也不起作用。

Answer 1

Blend包含在VisualStudio2105中，并附带了交互式dll。如果使用路径：xmlns：d =“http://schemas.microsoft.com/expression/2010/intera ctivity”而不是xmlns：d =“http://schemas.microsoft.com/expression/blend/ 2008“OnAttached方法得到正确调用。