原创来自http://www.luofenming.com/show.aspx?id=ART2018091000001,如转载请保留此地址
private void textBox1_KeyPress(object sender, KeyPressEventArgs e) { // e.KeyChar == 8 退格 删除 if ((e.KeyChar >= 'a' && e.KeyChar <= 'z') || (e.KeyChar >= 'A' && e.KeyChar <= 'Z') || (e.KeyChar >= '0' && e.KeyChar <= '9') || (e.KeyChar == 8)) { e.Handled = false;//这可以输入 } else { e.Handled = true;//不能输入 } }