c# - 从IList <string>或IEnumerable <string>创建逗号分隔列表(Creating a comma separated list from IList<string> or IEnumerable<string>)

Question

What is the cleanest way to create a comma-separated list of string values from an IList<string> or IEnumerable<string> ?

(从IList<string>或IEnumerable<string>创建以逗号分隔的字符串值列表的最简洁方法是什么？)

String.Join(...) operates on a string[] so can be cumbersome to work with when types such as IList<string> or IEnumerable<string> cannot easily be converted into a string array.

(String.Join(...)对string[]操作，因此当IList<string>或IEnumerable<string>无法轻松转换为字符串数组时，使用起来会非常麻烦。)

  ask by Daniel Fortunov translate from so

Answer 1

.NET 4+

(.NET 4+)

IList<string> strings = new List<string>{"1","2","testing"};
string joined = string.Join(",", strings);

Detail & Pre .Net 4.0 Solutions

(详细信息和Pre .Net 4.0解决方案)

IEnumerable<string> can be converted into a string array very easily with LINQ (.NET 3.5):

(使用LINQ（.NET 3.5）可以非常轻松地将IEnumerable<string>转换为字符串数组：)

IEnumerable<string> strings = ...;
string[] array = strings.ToArray();

It's easy enough to write the equivalent helper method if you need to:

(如果需要，可以很容易地编写等效的辅助方法：)

public static T[] ToArray(IEnumerable<T> source)
{
    return new List<T>(source).ToArray();
}

Then call it like this:

(然后像这样称呼它：)

IEnumerable<string> strings = ...;
string[] array = Helpers.ToArray(strings);

You can then call string.Join .

(然后你可以调用string.Join 。)

Of course, you don't have to use a helper method:

(当然，你不必使用一个辅助方法：)

// C# 3 and .NET 3.5 way:
string joined = string.Join(",", strings.ToArray());
// C# 2 and .NET 2.0 way:
string joined = string.Join(",", new List<string>(strings).ToArray());

The latter is a bit of a mouthful though :)

(后者虽然有点满口:))

This is likely to be the simplest way to do it, and quite performant as well - there are other questions about exactly what the performance is like, including (but not limited to) this one .

(这可能是最简单的方法，并且性能也非常高 - 还有其他问题，关于性能是什么样的，包括（但不限于） 这个 。)

As of .NET 4.0, there are more overloads available in string.Join , so you can actually just write:

(从.NET 4.0开始， string.Join有更多的重载，所以你实际上可以写：)

string joined = string.Join(",", strings);

Much simpler :)

(更简单:))