一个串内递增一个号码（C＃） [英] Increment a number within a string (C#)

问题描述

我有一个数字结尾的字符串，破折号（ - ）之后。我想创建与1很简单增加了许多相同的字符串，但我不知道是否有这个更好的办法？ ！谢谢

 字符串oldString =BA-0001-3; 
 INT lastIndex的= oldString.LastIndexOf（ - ）; 
串oldNumber = oldString.SubString（lastIndex的+ 1）; 
串oldPartialString = oldString.SubString（0，lastIndex的）; 
 INT newNumber = Convert.ToInt32（oldNumber）+ 1; 
 
串newString = oldPartialString + newNumber.ToString（）; 
  

解决方案

我可能会用我的朋友 string.Split ：

 字符串oldString =BA-0001-3; 
的String [] =零件oldString.Split（' - '）; 
份〔parts.Length-1] =（Convert.ToInt32（份〔parts.Length-1）+ 1）的ToString（）; 
串newString =的string.join（ - ，份）; 
  

一个小的调整，也许会让它更快（通过访问 parts.Length 并减去1只有一次 - 没有配置文件，因此这纯粹是猜测，这可能是一个边际差异），但首先更健壮（通过使用 int.TryParse ）：

 字符串oldString =BA-0001-3; 
的String [] =零件oldString.Split（' - '）; 
 INT编号; 
 INT lastIndex的= parts.Length-1; 
部分[lastIndex的] =（int.TryParse（零件[lastIndex的]，出数）+数字：1？）的ToString（）; 
串newString =的string.join（ - ，份）; 
  

I have a string with a number at the end, after a dash ("-"). I'd like to create that same string with that number incremented by 1. Pretty simple, but I'm wondering if there's a better approach to this? Thanks!

string oldString = "BA-0001-3";
int lastIndex = oldString.LastIndexOf("-");
string oldNumber = oldString.SubString(lastIndex + 1);
string oldPartialString = oldString.SubString(0, lastIndex);
int newNumber = Convert.ToInt32(oldNumber) + 1;

string newString = oldPartialString + newNumber.ToString();

解决方案

I would probably use my friend string.Split:

string oldString = "BA-0001-3";
string[] parts = oldString.Split('-');
parts[parts.Length-1] = (Convert.ToInt32(parts[parts.Length-1])+1).ToString();
string newString = string.Join("-", parts);

A small tweak that will perhaps make it quicker (by accessing parts.Length and subtracting 1 only once - didn't profile so it's purely a guess, and it is likely a marginal difference anyway), but above all more robust (by using int.TryParse):

string oldString = "BA-0001-3";
string[] parts = oldString.Split('-');
int number;
int lastIndex = parts.Length-1;
parts[lastIndex] = (int.TryParse(parts[lastIndex], out number) ? ++number : 1).ToString();
string newString = string.Join("-", parts);

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