c#文本框限制输入内容
//限制输入不能为中文和全角
private void zhbh_KeyPress(object sender, KeyPressEventArgs e)
{
int chfrom = Convert .ToInt32("4e00", 16); //范围（0x4e00～0x9fa5）转换成int（chfrom～chend）
int chend = Convert .ToInt32("9fa5", 16);
if (e.KeyChar >= (Char )chfrom && e.KeyChar <= (Char)chend)
{
e.Handled = true;
}
if (e.KeyChar >= (Char )65281 & (int)e.KeyChar <= ( Char)65374)
{
e.Handled = true;
}
}
//*******以下方法需在文本框的KeyPress方法下调用
//限制输入只能为数字
private void wz_qsh_KeyPress(object sender, KeyPressEventArgs e)
{
if (!(Char .IsNumber(e.KeyChar)) && e.KeyChar != (Char)8)
{
e.Handled = true;
}
}
/**
* 限制只能输入数字和小数点
* */
public void validationOnlyFloat(KeyPressEventArgs e, TextBox t)
{
if (((int )e.KeyChar < 48 || (int)e.KeyChar > 57) && ( int)e.KeyChar != 8 && (int )e.KeyChar != 46)
e.Handled = true;
//小数点的处理。
if ((int )e.KeyChar == 46) //小数点
{
if (t.Text.Length <= 0)
e.Handled = true; //小数点不能在第一位
else
{
float f;
float oldf;
bool b1 = false , b2 = false;
b1 = float.TryParse(t.Text, out oldf);
b2 = float.TryParse(t.Text + e.KeyChar.ToString(), out f);
if (b2 == false )
{
if (b1 == true )
e.Handled = true;
else
e.Handled = false;
}
}
}
}