如何使文本框不乱扔垃圾 [英] How to make the textbox Does not accept litter

问题描述

如何使文本框不接受垃圾

How to make the textbox Does not accept litter

推荐答案

如果您的意思是不接受字母"，例如"A"或"B"或"C"，然后:
处理TextBox KeyPress事件:

If you mean "not accept letter" as in ''A'' or ''B'' or ''C'', then:
handle the TextBox KeyPress event:

private void myTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
    if (char.IsLetter(e.KeyChar))
        {
        e.Handled = true;
        }
    }

如果您是指文本框不接受字母或不可编辑并且您使用的是Forms，请查看

If you mean that the text box doesn''t accept a letter or isn''t editable and you use Forms, have a look at ReadOnly[^] property

您可以还使用正则表达式来验证TextChanged事件上的文本框文本.

You can also use regular expressions to validate the textbox text on the TextChanged event.

private void textBox1_TextChanged(object sender, EventArgs e)
{
    Match myMatch = Regex.Match(textBox1.Text.ToLower(), "[a-z]");
    if (myMatch.Success)
    {
        MessageBox.Show("No letters allowed...");
        textBox1.Text = textBox1.Text.Remove(textBox1.Text.Length - 1);
    }
}

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