如何只允许在 TextBox 中输入 0 或 1? [英] How can I allow only 0 or 1 to be entered in a TextBox?

问题描述

如何将 TextBox 控件限制为仅允许值 0 和 1?

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

谢谢.我还有一个问题:如何禁用将剪贴板中的文本放入我的文本框控件?

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

推荐答案

通过使用事件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);
}

将 e.Handled 设置为 true/false 表示该字符是否应该被框接受.

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

您可以阅读更多关于 KeyPressEventArgs 在 MSDN 上.

You can read more about KeyPressEventArgs on MSDN.

注意

Keys.Delete 应涵盖 Keys.Delete、Keys.Backspace 和其他返回"按钮.

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

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