活動添加到WPF控制器，當屬性值改變

Question

我有一個屬性

public sealed partial class Computer 
{ 
    private bool _online; 
    public bool Online 
    { 
     get { return _online; } 
     set 
     { 
      _online = value; 
      RaiseProperty("Online"); 
     } 
    } 
} 

這引發了類型INotifyPropertyChanged的事件

public sealed partial class Computer : INotifyPropertyChanged 
{ 
    public event PropertyChangedEventHandler PropertyChanged; 

    private void RaiseProperty(string propertyName) 
    { 
     if (this.PropertyChanged != null) 
     { 
      this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
     } 
    } 
} 

我的問題是，我怎麼可以添加額外的事件，告訴在這種情況下，TabControl每次在線屬性更改時都會運行特定的方法？

Answer 1

您需要的方法註冊到PropertyChanged事件

MyComputer.PropertyChanged += Computer_PropertyChanged; 

void Computer_PropertyChanged(object sender, PropertyChangedEventArgs e) 
{ 
    if (e.PropertyName == "Online") 
    { 
     // Do Work 
    } 
} 

Answer 2

public sealed partial class Computer 
{ 
    // This event is fired every time when Online is changed 
    public event EventHandler OnlineChanged; 

    private bool _online; 
    public bool Online 
    { 
     get { return _online; } 
     set 
     { 
      // Exit if online value isn't changed 
      if (_online == value) return; 

      _online = value; 
      RaiseProperty("Online"); 

      // Raise additional event only if there are any subscribers 
      if (OnlineChanged != null) 
       OnlineChanged(this, null); 
     } 
    } 
} 

您可以使用此事件，如：

Computer MyComputer = new MyComputer(); 
MyComputer.OnlineChanged += MyComputer_OnlineChanged; 

void MyComputer_OnlineChanged(object sender, EventArgs e) 
{ 
    Computer c = (Computer)c; 
    MessageBox.Show("New value is " + c.Online.ToString()); 
}