如何检查 c# 中的鼠标左键是否按下 ctrl、alt？

Question

I want to check in my form if Ctrl Alt are pressed on left mouse click. Is there any way of checking it?

Answer 1

void window_MouseLeftButtonDown_1(object sender, MouseEventArgs e)
{
    if (Control.ModifierKeys == Keys.Control && Control.ModifierKeys == Keys.Alt)
    {
        //...
    }
}

Answer 2

WPF: Add event to your window in xaml:

MouseLeftButtonDown="window_MouseLeftButtonDown_1"

or in code behind:

public MainWindow()
{
   InitializeComponent();

   this.MouseLeftButtonDown += window_MouseLeftButtonDown_1;
}

and then you can check for the key presses in the call back

private void window_MouseLeftButtonDown_1(object sender, MouseButtonEventArgs e)
{
   if (Keyboard.IsKeyDown(Key.LeftCtrl) && Keyboard.IsKeyDown(Key.LeftAlt))
   {
      // ...
   }
}

Answer 3

To check if more than one modifier keys are presses use | operator.

ModifierKeys.Equals(Keys.Control|Keys.Alt)

Or

Control.ModifierKeys==(Keys.Control|Keys.Alt)

This example show a message if both of ctrl and alt keys are pressed when mouse clicked:

if(ModifierKeys.Equals(Keys.Control|Keys.Alt)){
      MessageBox.Show("Ctrl&Alt keys were pressed sametime");
}