文本框应接受0到366之间的数字 [英] Textbox should accept numbers from 0 to 366

问题描述

我是一个文本框，它只接受0到366之间输入的数字.
没有其他任何事情...

I''v a textbox and it should accept only numbers entered from 0 to 366.
Not any other things...

推荐答案

您可以为validate事件添加以下委托:

You may add the following delegate for the validate event:

private void Validate_Text(object sender, CancelEventArgs e)
{
    TextBox tb = sender as TextBox;
    if (tb != null)
    {
        int i;
        if (int.TryParse(tb.Text, out i))
        {
            if (i >= 0 && i <= 366)
                return;
        }
    }
    MessageBox.Show("invalid input");
    e.Cancel = true;
}

当然，您会为用户提供更好(更有用)的消息.
:)

Of course you will provide a better (more informative) message for the user.
:)

在文本框的按键事件中写入

at the keypress event of textbox write

if (!(e.KeyChar >= ''0'' && e.KeyChar <= ''9''))
                e.Handled = true;

只能输入数字.
当我得到您的第二个问题时，有关文本框内数字的限制.为此，您可以使用textnox的 MaxLength 属性

it will secure to enter only numbers.
and as i getting your second question is about limitation of numbers enetered in Textbox. for this you can use MaxLength property of textnox

如何使用NumericUpdown Control [

How about you use NumericUpdown Control[http://msdn.microsoft.com/en-us/library/729xt55s.aspx[^]]? It does what you want. It has Minimum, Maximum, Skip properties, and takes in a number.

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