创建获取0或1字符串的文本框 [英] create textbox that gets 0 or 1strings

问题描述

如何创建仅获取0或1个字符串的文本框?

请帮帮我.

谢谢

How can I create a textbox that just gets 0 or 1 strings?

Please help me.

Thanks

推荐答案

你好，亲爱的
首先，必须将TextBox的MaxLength属性设置为1，这确定用户不能在TextBox中插入超过1个字符，然后在TextBox的KeyPress事件的事件处理程序中编写此代码

Hello Dear
first you must set MaxLength property of TextBox to 1 which determines user can not insert more than 1 character in TextBox then in event handler of KeyPress event of TextBox write this code

if (e.KeyChar == '0' || e.KeyChar == '1')
    return;
else
    e.Handled = true;

使用文本框的错误提示.使用两个单选按钮或一个组合框或仅包含两个值的列表框.选择(或在单选按钮的情况下进行检查)将表示0，第二个为1；否则为0.使用适当的标签或文本项向用户显示哪一个是什么.

—SA

Bad idea to use a text box for it. Use two radio buttons or a combo box or a list box with just two values. Selecting (or checking in case of radio button) will mean 0, second one 1; use appropriate label or text items to show to the user which one is what.

—SA

在构造函数中添加以下事件处理程序:

Add the following event-handler in the constructor:

textBox1.KeyPress += new KeyPressEventHandler(textBox1_KeyPress);

事件:

Event:

void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if ((e.KeyChar.Equals('0')) || (e.KeyChar.Equals('1')))
    {
        e.Handled = false;
    }
    else
    {
        e.Handled = true;
    }
}

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