WPF中MVVM模式下的按钮事件实现和依赖项通知

1 public classCommandBase: ICommand
2 {
3          readonlyAction _excuteMethod;
4         //设置按钮的可用性
5         public bool CanExecute(objectparameter)
6 {
7             return true;
8 }
9 
10         public eventEventHandler CanExecuteChanged
11 {
12 add
13 {
14                 CommandManager.RequerySuggested +=value ;
15 
16 }
17 remove
18 {
19                 CommandManager.RequerySuggested -=value ;
20 }
21 }
22 
23         //按钮的执行事件
24         public void Execute(objectparameter)
25 {                       
26 _excuteMethod();
27 }
28         #endregion
29 }

1      publicICommand CloseCommand
2 {
3             get
4 {
5                 return newCommandBase();
6 }
7         } 

1 publicCommandBase(Action excuteMethod)           
2 {
3             if (excuteMethod == null)
4 {
5                 throw newException();
6 }
7             _excuteMethod =excuteMethod;           
8 
9 }
10 
11      publicICommand CloseCommand
12 {
13             get
14 {
15                 return newCommandBase(Close);
16 }
17 } 
18          voidClose()
19 {
20              
21         }

1 public eventPropertyChangedEventHandler PropertyChanged;
2      
3 public delegate void ContextChangedEventHandler(objectsender);
4       public eventContextChangedEventHandler ContextChanged;
5      
6 protected void OnPropertyChanged(stringpropertyname)
7 
8 
9 {          
10 if (ContextChanged != null)
11 
12 
13 {
14 
15 
16 ContextChanged(propertyname);
17 
18 
19 }
20            
21 if (PropertyChanged != null)
22 
23 
24                 PropertyChanged( this, newPropertyChangedEventArgs(propertyname));
25 
26 
27         }

1 public stringValue
2 {
3             get
4 {
5                 return_value;
6             }