.NET 4+
IList<string> strings = new List<string>{"1","2","testing"}; string joined = string.Join(",", strings);
Detail & Pre .Net 4.0 Solutions
IEnumerable<string>
can be converted into a string array very easily with LINQ (.NET 3.5):
IEnumerable<string> strings = ...; string[] array = strings.ToArray();
It’s easy enough to write the equivalent helper method if you need to:
public static T[] ToArray(IEnumerable<T> source) { return new List<T>(source).ToArray(); }
Then call it like this:
IEnumerable<string> strings = ...; string[] array = Helpers.ToArray(strings);
You can then call string.Join
. Of course, you don’t have to use a helper method:
// 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 🙂
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.
As of .NET 4.0, there are more overloads available in string.Join
, so you can actually just write:
string joined = string.Join(",", strings);
Much simpler 🙂