How to check if a ctrl + enter is pressed on a control?

通过注册ComponentDispatcher.ThreadPreprocessMessage 事件实现。

// Registering against a stack event will cause memory leak, please unregister this event when you are done with it.

ComponentDispatcher.ThreadPreprocessMessage += ComponentDispatcher_ThreadPreprocessMessage;

// WM_KEYDOWN 是按下一个键是产生的消息。
const int WM_KEYDOWN = 0x100;
// WM_SYSKEYDOWN 是按下Alt键同时再按下别的键时产生的消息。
const int WM_SYSKEYDOWN = 0x0104;

void ComponentDispatcher_ThreadPreprocessMessage(ref MSG msg, ref bool handled)

{

      if (msg.message == WM_KEYDOWN || msg.message == WM_SYSKEYDOWN)

      {

         // Examine if the Control and Enter keys are pressed, we also need to make sure that the 
        // currently keyborad focused element is TextBox instance itself. 
        // "|" 二进制或运算，有一个为1则结果为1。
        // "&" 二进制与运算，两个都为1则结果为1. Keys转换为int的值就是Keys这个枚举类中定义的该枚举项的值。

         Keys keyData = ((Keys)((int)(msg.wParam))) | System.Windows.Forms.Control.ModifierKeys;

         if (((keyData & Keys.Control) == Keys.Control) &&

         ((keyData & Keys.Enter) == Keys.Enter) &&

         Keyboard.FocusedElement == this.txtBox)

         {

               System.Windows.MessageBox.Show("Ctrl+Enter is pressed");

         }

      }
}