我应如何检查字母是A到Z还是A到Z [英] how shall i check the letter is a to z or A to Z

问题描述

发送示例代码以将TextBox输入值检查为A-z或a-z

Send sample coding for checking the TextBox input value as A-z or a-z

推荐答案

也许您可以使用正则表达式:

Hi,

maybe you could use regular expressions:

private void textBox1_TextChanged(object sender, EventArgs e)
{
  Regex re = new Regex("^[-''a-zA-Z]*

"); if (re.IsMatch(textBox1.Text)) MessageBox.Show(Test success - only valid characters"); }

"); if (re.IsMatch(textBox1.Text)) MessageBox.Show(Test success - only valid characters"); }

或更详细地做::-D

Or do it more verbosely: :-D

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    Char c = e.KeyChar;
    int i = (int) c;
    int sa = (int) ''a'';
    int sz = (int) ''z'';
    int ba = (int) ''A'';
    int bz = (int) ''Z'';
    if (! ((i >= sa && i <= sz) || (i >= ba && i <= bz)))
    {
        e.Handled = true;
    }
}

将KeyPressEventArg的Handled属性设置为true，可以使事件vom传播，从而吞噬输入.

干杯

曼弗雷德(Manfred)

Setting Handled property on KeyPressEventArg to true, keeps the event vom propagating thus swallowing the input.

Cheers

Manfred

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