格式化文本框(电话号码，手机号码，电子邮件)

本文介绍了格式化文本框(电话号码，手机号码，电子邮件)的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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; }