代码说明：我要实现一个这样的功能  有三个window窗口  每个窗体有一个label标签  当我修改三个label标签中任意一个字体颜色的时候  其他的label标签字体颜色也变化

首先三个窗体不用贴代码了  直接添加三个就行了

样式绑定：

先添加数据源  代码如下： （注：为了防止propertyName硬编码写死   可以使用CallerMemberName附加属性来获取默认的属性名称 或者使用表达式目录树Expression<Func<T>>的方式来获取）

1 public class ButtonBase : ContentControl, INotifyPropertyChanged 2     { 3         public static readonly RoutedEvent ClickEvent; 4         private SolidColorBrush brush = new SolidColorBrush(Colors.Red); 5  6         public event PropertyChangedEventHandler PropertyChanged; 7  8         private static ButtonBase btnBase; 9         10         public static ButtonBase getButtonBase()11         {12             if (btnBase == null)13                 btnBase = new ButtonBase() { Foreground = new SolidColorBrush(Colors.Red) };14             return btnBase;15         }16         public SolidColorBrush Brush17         {18             get { return brush; }19             set20             {21                 if (value != brush)22                 {23                     brush = value;24                     NotifyPropertyChanged
      
       (() => this.Brush);//NotifyPropertyChanged();25                 }26             }27         }28         private void NotifyPropertyChanged([CallerMemberName] String PropertyName = "")29         {30             if (PropertyChanged != null)31                 PropertyChanged(this, new PropertyChangedEventArgs(PropertyName));32         }33         private void NotifyPropertyChanged
       
        (Expression
        
         
          > PropertyName)34         {35             if (PropertyChanged != null)36             {37                 var expressions = PropertyName.Body as MemberExpression;38 39                 PropertyChanged(this, new PropertyChangedEventArgs(expressions.Member.Name));40             }41         }
         
        
       
      

给Label标签绑定数据源  窗体初始化的时候绑定三遍就可以了  绑定完以后  直接设置就行了

Binding bind = new Binding();            bind.Source = ButtonBase.getButtonBase();            bind.Mode = BindingMode.TwoWay;            bind.Path = new PropertyPath("Brush");            label1.SetBinding(Label.ForegroundProperty, bind);

行为绑定

先添加引用 C:\Program Files (x86)\Microsoft SDKs\Expression\Blend\.NETFramework\v4.5\Libraries\System.Windows.Interactivity.dll

using System.Windows.Interactivity;

定义一个UIElement拖动的行为

1 public class DragInCanvasBehavior : Behavior
      
        2     { 3         private Canvas canvas; 4         private bool isDragOn = false; 5         private Point mouseOffset; 6         protected override void OnAttached() 7         { 8             base.OnAttached(); 9             this.AssociatedObject.MouseLeftButtonDown += AssociatedObject_MouseLeftButtonDown;10             this.AssociatedObject.MouseLeftButtonUp += AssociatedObject_MouseLeftButtonUp;11             this.AssociatedObject.MouseMove += AssociatedObject_MouseMove;12         }13         protected override void OnDetaching()14         {15             base.OnDetaching();16             this.AssociatedObject.MouseLeftButtonDown -= AssociatedObject_MouseLeftButtonDown;17             this.AssociatedObject.MouseLeftButtonUp -= AssociatedObject_MouseLeftButtonUp;18             this.AssociatedObject.MouseMove -= AssociatedObject_MouseMove;19         }20         void AssociatedObject_MouseMove(object sender, MouseEventArgs e)21         {22             if (isDragOn)23             {24                 Point point = e.GetPosition(canvas);25                 AssociatedObject.SetValue(Canvas.LeftProperty,point.X);26                 AssociatedObject.SetValue(Canvas.TopProperty,point.Y);27             }28         }29 30         void AssociatedObject_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)31         {32             if (isDragOn)33             {34                 AssociatedObject.ReleaseMouseCapture();35                 isDragOn = false;   36             }37         }38 39         void AssociatedObject_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)40         {41             if (canvas == null)42                 canvas = (Canvas)VisualTreeHelper.GetParent(this.AssociatedObject);43             isDragOn = true;44             mouseOffset = e.GetPosition(AssociatedObject);45             AssociatedObject.CaptureMouse();46         }47       48     }
      

前台使用该行为

1  xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity" 2  3 
      
        4             
       
         5                 
        
          6                     
          7                     
          8                     
          9                     
         10                 
        11             
       12             
       
        13                 
        
         14                     
         15                 
        16             
       17             
       18                 
        
         19                     
         20                 
        21             22         
      

事件关联   当鼠标放到button上面的时候字体变大  button背景颜色变化

1 

App.xmal.cs 后台代码

1  private void button_MouseEnter(object sender, MouseEventArgs e)2         {3             (sender as Button).Background = new SolidColorBrush(Colors.Brown);4         }5         private void button_MouseLeave(object sender, MouseEventArgs e)6         {7             (sender as Button).Background = null;8         }