How to use arrow keys in Form

This article mainly introduces "how to use the arrow keys in Form". In daily operation, I believe many people have doubts about how to use the arrow keys in Form. Xiaobian consulted all kinds of information and sorted out simple and easy operation methods. I hope to help you answer the doubts about "how to use the arrow keys in Form"! Next, please follow the small series to learn together!

In fact, it's very simple. I used hook functions to solve it before. In fact, it's not necessary at all. Rewrite the Form method.

const int WM_SYSKEYDOWN=260;const int WM_KEYDOWN=256;protected override bool ProcessCmdKey(ref Message msg,Keys keyData){if ((msg.Msg==WM_KEYDOWN)||(msg.Msg==WM_SYSKEYDOWN)){switch (keyData){case Keys.Up:MessageBox.Show("up");break;case Keys.Down:MessageBox.Show("down");break;case Keys.Left:MessageBox.Show("left");break;case Keys.Right:MessageBox.Show("right");break;}}return true;}

Supplement: After experiments, this method can only extract KEYDOWN information, while KEYUP information is "eaten", so some things that need KEYUP events cannot be done.

Finally found a class in CodeProject to handle this, very convenient: www.codeproject.com/KB/cs/globalhook.aspx

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