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限制只能输入数字
//限制只能输入数字------------------------------------------------------
private void txtUserID_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar != '\b' && !Char.IsDigit(e.KeyChar))
{
e.Handled = true;
MessageBox.Show("请输入数字,并确保在11位以内!");
}
}
限制只能输入字母和数字
//限制密码只能输入字母或者数字
private void txtPassword_KeyPress(object sender, KeyPressEventArgs e)
{
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;
}
else
{
e.Handled = true;
MessageBox.Show("密码只能是字母或者数字");
}
}
限制只能输入汉字
//添加命名空间
using System.Text.RegularExpressions;
//限制只能输入汉字
private void txtSName_KeyPress(object sender, KeyPressEventArgs e)
{
Regex rg = new Regex("^[\u4e00-\u9fa5\b]$"); //\b是退格键
if (!rg.IsMatch(e.KeyChar.ToString()))
{
e.Handled = true;
MessageBox.Show("您只能输入汉字!");
}
}