我怎么能只允许0或1到一个文本框输入？ [英] How can I allow only 0 or 1 to be entered in a TextBox?

问题描述

如何限制TextBox控件只允许值0和1？

How can I limit the TextBox control to only allow the values 0 and 1?

感谢。我有一个问题：我如何禁用在我的文本框控件从剪贴板中把文本

Thanks. And I have one more question: How can I disable put text from clipboard in my textbox control?

推荐答案

使用事件的KeyPress

private void NumericOnlyKeyBox_KeyPress(object sender, KeyPressEventArgs e)
{
    var validKeys = new[] { Keys.Back, Keys.D0, Keys.D1 };

    e.Handled = !validKeys.Contains((Keys)e.KeyChar);
}

设置 e.Handled 为true / false表示，如果字符应该被接受的盒子还是不行。

Setting e.Handled to true / false indicates if the character should be accepted to the box or not.

您可以阅读更多有关的 KeyPressEventArgs 。

You can read more about KeyPressEventArgs on MSDN.

注意

Keys.Delete应涵盖Keys.Delete，Keys.Backspace等后退按钮。

Keys.Delete should cover Keys.Delete, Keys.Backspace and other "Back" buttons.

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