在C＃中串连整数 [英] Concatenate integers in C#

问题描述

是否有一个的便宜的方式来串联整数CSHARP

Is there an inexpensive way to concatenate integers in csharp?

？例如：1039&安培; 7056 = 10397056

Example: 1039 & 7056 = 10397056

推荐答案

如果你能找到的情况下，这是够贵的，以引起任何关注，我会很感动

If you can find a situation where this is expensive enough to cause any concern, I'll be very impressed:

int a = 1039;
int b = 7056;

int newNumber = int.Parse(a.ToString() + b.ToString())

或者，如果你希望它是多一点。NET杂交：

Or, if you want it to be a little more ".NET-ish":

int newNumber = Convert.ToInt32(string.Format("{0}{1}", a, b));

int.Parse是的不的一个昂贵的操作。 。花时间担心网络I / O和O的^ N正则表达式

int.Parse is not an expensive operation. Spend your time worrying about network I/O and O^N regexes.

其他说明：实例化的开销的StringBuilder意味着没有点，如果你只是做了几个串联。而且很重要的是 - 如果你的是的规划，把这个回一个整数，记住它限于〜20亿。串联数变得非常大非常快，可能远远超出一个32位int的能力。 （当然签署）。

Other notes: the overhead of instantiating StringBuilder means there's no point if you're only doing a few concatenations. And very importantly - if you are planning to turn this back into an integer, keep in mind it's limited to ~2,000,000,000. Concatenating numbers gets very large very quickly, and possibly well beyond the capacity of a 32-bit int. (signed of course).

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