如何在C#中向字符串添加字符 [英] How to add characters to a string in C#

问题描述

问题:我想在手机中添加字符.

因此，我不想显示(###)###-####.#p ####################################################################################################

我尝试了以下操作:

  string x ="Phone_Number";字符串y = x.Remove(0,2);//删除"1-" 

从这里开始，我不确定如何在###

周围添加()"

任何帮助将不胜感激.

解决方案

值得注意的是，字符串在C#中是不可变的.这意味着，如果您尝试修改一个字符串，则始终会得到一个新的字符串对象.

一种方法是将其转换为数字(作为健全性检查)，然后格式化字符串

  var结果= String.Format("{0:(###)###-####}"，double.Parse("8005551234")) 

如果您不想进行双重转换，则可以执行以下操作:

  var结果= String.Format(({{}} {1}-{2}")，x.Substring(0，3)，x.Substring(3，3)，x.Substring(6))； 

或者，如果您已经有连字符并且真的只想插入括号，那么您可以执行以下操作:

  var结果= x.Insert(3，)").Insert(0，("); 

Problem: I would like add characters to a phone.

So instead of displaying ###-###-####, I would like to display (###) ###-####.

I tried the following:

string x = "Phone_Number";
string y = x.Remove(0,2);//removes the "1-"

From here, I am not sure how I would add "()" around ###

Any help would be appreciated.

解决方案

It's worth noting that strings are immutable in C#.. meaning that if you attempt to modify one you'll always be given a new string object.

One route would be to convert to a number (as a sanity check) then format the string

var result = String.Format("{0:(###) ###-####}", double.Parse("8005551234"))

If you'd rather not do the double-conversion then you could do something like this:

var result = String.Format("({0}) {1}-{2}", x.Substring(0 , 3), x.Substring(3, 3), x.Substring(6));

Or, if you already have the hyphen in place and really just want to jam in the parenthesis then you can do something like this:

var result = x.Insert(3, ")").Insert(0, "(");

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