[英]How to detect a custom key from Keyboard using C#
我有一個USB鍵盤,其中有一些特殊鍵,例如“ FN”,PLAY,MUTE和一個可以改變鍵盤燈的鍵。 我試圖獲取這個鍵的“名稱”是什么,以執行邏輯以定期更改顏色。
private void textBox1_TextChanged(object sender, EventArgs e)
{
var key = sender as TextBox;
var result = key.Text;
}
但是密鑰不是一個可以識別的字符串。 我怎樣才能做到這一點 ? 謝謝!
我建議您使用OnKeyPress
和OnKeyDown
事件來檢查按下的內容。 MSDN鏈接 。
例:
// Boolean flag used to determine when a character other than a number is entered.
private bool nonNumberEntered = false;
// Handle the KeyDown event to determine the type of character entered into the control.
private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
// Initialize the flag to false.
nonNumberEntered = false;
// Determine whether the keystroke is a number from the top of the keyboard.
if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
{
// Determine whether the keystroke is a number from the keypad.
if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
{
// Determine whether the keystroke is a backspace.
if(e.KeyCode != Keys.Back)
{
// A non-numerical keystroke was pressed.
// Set the flag to true and evaluate in KeyPress event.
nonNumberEntered = true;
}
}
}
//If shift key was pressed, it's not a number.
if (Control.ModifierKeys == Keys.Shift) {
nonNumberEntered = true;
}
}
// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
// Check for the flag being set in the KeyDown event.
if (nonNumberEntered == true)
{
// Stop the character from being entered into the control since it is non-numerical.
e.Handled = true;
}
}
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