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组合键(CTRL+F9)导致调用方法,仅当按F9时才应调用该方法

keydown xaml wpf c#

-2

Roxy'Pro · 技术社区 · 7 年前

我正在处理WPF应用程序,当按下组合键时,我会显示模态/形式,所以在我的例子中是这样的 CTRL + F9 , 下面是我的代码:

//Listening on Window_PreviewKeyDown any key pressing
private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
{ 

 if (e.Key == Key.Escape)
 {
    LockAllInputs();
 }

 if (e.Key == Key.Tab)
 {
    e.Handled = true;
 }

 if (e.Key == Key.F11)
 {
     this.Close();
 }
   // Opening modal when Key combination of CTRL AND F9 is pressed
   if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.F9)
   {
     MyModal modal = new MyModal();
    // Do something
   }

   //Hitting a method when only F9 is pressed
    if (e.Key == Key.F9)
    {
      //This is invoked everytime after CTRL+F9
      CallAnotherMethod();
    }
}

但我代码中的问题是 CTRL+F9 它工作正常,但在调用该方法之后 F9 也正在调用。。这是我想要避免的, CTRL+F9 正在做一件事,F9正在做另一件事,所以我不想 F9层 在以下情况下调用 CTRL+F9 已按下。。。

谢谢各位

3 回复 | 直到 7 年前

mjwills Myles McDonnell 7 年前

if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.F9)
{
  MyModal modal = new MyModal();
  modal.ShowDialog();
  e.Handled = true;//Here I've tried to prevent hitting another method which is being called when F9 is pressed
 }

//Hitting a method when only F9 is pressed
if (e.Key == Key.F9)
{
  //This is invoked everytime after CTRL+F9
  CallAnotherMethod();
}

您的代码将继续执行之后第一个 if ,则将进入第二个 如果 也

最简单的解决方案是改变第二个 如果 至 else if :

else if (e.Key == Key.F9)
{
  //This is invoked everytime after CTRL+F9
  CallAnotherMethod();
}

另一种选择是停止执行该函数 在…内 第一个 如果 :

if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.F9)
{
  MyModal modal = new MyModal();
  modal.ShowDialog();
  e.Handled = true;
  return;
}

Ivan IÄin 7 年前

应该是这样的:

    //Listening on Window_PreviewKeyDown any key pressing
private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
{ 

 if (e.Key == Key.Escape)
 {
    LockAllInputs();
 }

 if (e.Key == Key.Tab)
 {
    e.Handled = true;
 }

 if (e.Key == Key.F11)
 {
     this.Close();
 }
   // Opening modal when Key combination of CTRL AND F9 is pressed
   if (Keyboard.Modifiers == ModifierKeys.Control && e.Key == Key.F9)
   {
     MyModal modal = new MyModal();
     modal.ShowDialog();
     e.Handled = true;//Here I've tried to prevent hitting another method which is being called when F9 is pressed
   }

   //Hitting a method when only F9 is pressed
    if (Keyboard.Modifiers == ModifierKeys.None && e.Key == Key.F9)
    {
      CallAnotherMethod();
    }
}

Magnetron 7 年前

您只检查F9键是否是触发事件的键,而不检查是否还按下了任何其他键。您有两种解决方案:

更改第二个 if 至 if else ;
检查是否未按下其他修改器。