加盟字符串最efficent方式 [英] Most efficent way of joining strings

问题描述

我需要产品总数串联了很多串，并把其中的任何中间用逗号分隔。
我有一个字符串

I need to concatenate a lot of strings alltogether and put a comma between any of them. I have a list of strings

"123123123213"
"1232113213213"
"123213123"

和我想要得到

"123123123213,1232113213213,123213123"

我想知道是什么。最好的方式来实现这一目标。

I was wondering what is the best way to achieve that.

我能做到这一点是这样的：

I could do this like this:

private List<string> stringList = new List<string> { 
    // a lot of strings in here
    "1234567890", "34343434", "4343434" }; 

string outcome = string.Join(",", stringList.ToArray());

也许

Or maybe:

StringBuilder builder = new StringBuilder();
stringList.ForEach(val => {
    builder.Append(val);
    builder.Append(",");
});

string outcome = builder.ToString();

哪种方式更好？你知道更好的方法来连接字符串？

Which way is better? Do you know better ways to concatenate strings?

推荐答案

作为的 @ Ekkehard 说，使用串。加入。

不过，你不需要 ToArray的（），因为的string.join 有的IEnumerable<字符串方式>

However, you do not need the ToArray() because string.Join has an overload for IEnumerable<string>.

List<string> stringList = new List<string> 
    { "1234567890", "34343434", "4343434" }; 

string outcome = string.Join(",", stringList);

修改

由于 @Kobi 说，这将工作仅C＃4.0。在3.5，我会做

As @Kobi said, this will work only C# 4.0. In 3.5 I would do.

var s = new StringBuilder(stringList.Count * 8);
foreach (var item in stringList)
{
   s.Append(item);
   s.Append(',');
}
s.Length -= 1;
string outcome = stringList.ToList();

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