C# 文本框只能输入数字和退格键

参考：/dtdnh520/articles/538684.html

按键不是数字和退格键，则忽略该键按下并释放的事件

private void TextBox_KeyPress(object sender, KeyPressEventArgs e){KeyIsNotNumberOrBackspace(e);}/// <summary>/// 按键不是数字和退格键/// </summary>/// <param name="e"></param>/// <returns></returns>public static void KeyIsNotNumberOrBackspace(KeyPressEventArgs e){bool keyIsNotNumberOrBackspace = e.KeyChar != '\b' && !Char.IsDigit(e.KeyChar);if (keyIsNotNumberOrBackspace){e.Handled = true;}}