格式化文本框(电话号码，手机号码，电子邮件) [英] Formatting a Textbox (Phone Numbers, Mobile Numbers, Emails)

问题描述

我想知道如何将文本框输入转换为不同的格式.我尝试使用Format.String()，因为它是经过一些研究后在网上找到的解决方案"，但对我而言效果并不理想.

I'd like to know how to cast textbox input into different formats. I tried using Format.String() since it's the 'solution' I found online after doing some research but it did not end well for me.

  private void RegHomePhoneTBox_TextChanged(object sender, EventArgs e)
    {
        string s = RegHomePhoneTBox.Text;
        double sAsD = double.Parse(s);
        RegHomePhoneTBox.Text = string.Format("{0:###-####}", sAsD).ToString();
    }

这是我使用的代码块，并且不断抛出错误.

This was the code block I used and it just keep on throwing an error.

"System.FormatException"类型的未处理异常发生在 mscorlib.dll附加信息:输入字符串不正确 格式.

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll Additional information: Input string was not in a correct format.

推荐答案

尝试一下:

  private void RegHomePhoneTBox_TextChanged(object sender, EventArgs e)
    {
        string s = RegHomePhoneTBox.Text;
        if (s.Length == 7)
        {
           double sAsD = double.Parse(s);
           RegHomePhoneTBox.Text = string.Format("{0:###-####}", sAsD).ToString();
        }
        if (RegHomePhoneTBox.Text.Length > 1)
             RegHomePhoneTBox.SelectionStart = RegHomePhoneTBox.Text.Length;
        RegHomePhoneTBox.SelectionLength = 0;
    }

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