MessageBoxResult按钮取消关闭应用程序

Question

当窗口关闭时，我正在调用方法TryClose来显示对话框。但是当我点击Cancel该应用程序关闭。任何想法只是为了“隐藏”对话框，不做别的事情？

public void TryClose() 
{ 
    MessageBoxResult result = MessageBox.Show("Do you want to save changes?", appName, MessageBoxButton.YesNoCancel, MessageBoxImage.Warning); 

    switch (result) 
    { 
     case MessageBoxResult.Yes: 
      SaveAs(); 
      break; 
     case MessageBoxResult.No: 
      this.Close(); 
      break; 
    } 
} 

Answer 1

你的代码改成这样：

public bool TryClose() 
{ 
    MessageBoxResult result = MessageBox.Show("Do you want to save changes?", appName, MessageBoxButton.YesNoCancel, MessageBoxImage.Warning); 

    switch (result) 
    { 
     case MessageBoxResult.Yes: 
      SaveAs(); 
      return false; 
     case MessageBoxResult.No: 
      this.Close(); 
      return false; 
    } 

    return true; 
} 

而在你关闭事件处理程序，把这个：

private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
{ 
    e.Cancel = TryClose(); 
} 

Answer 2

private void Form_FormClosing(object sender, FormClosingEventArgs e) 
{ 
    TryClose(e); 
} 

然后：

switch (result) 
{ 
    case MessageBoxResult.Yes: 
     SaveAs(); 
     break; 
    case MessageBoxResult.No: 
     this.Close(); 
     break; 
    default: 
     e.Cancel=true; 
     break; 
}