Converting a List to a comma separated string

Question

Is there a way to take a List and convert it into a comma separated string?

I know I can just loop and build it, but somehow I think some of you guys a more cool w

Answer 1

Seems reasonablly fast.

IList<int> listItem = Enumerable.Range(0, 100000).ToList();
var result = listItem.Aggregate<int, StringBuilder, string>(new StringBuilder(), (strBuild, intVal) => { strBuild.Append(intVal); strBuild.Append(","); return strBuild; }, (strBuild) => strBuild.ToString(0, strBuild.Length - 1));

Answer 2

List<int> list = new List<int> { 1, 2, 3 };
Console.WriteLine(String.Join(",", list.Select(i => i.ToString()).ToArray()));

Answer 3

List<int> list = ...;
string.Join(",", list.Select(n => n.ToString()).ToArray())

Answer 4

For extra coolness I would make this an extension method on IEnumerable<T> so that it works on any IEnumerable:

public static class IEnumerableExtensions {
  public static string BuildString<T>(this IEnumerable<T> self, string delim = ",") {
    return string.Join(delim, self)        
  }
}

Use it as follows:

List<int> list = new List<int> { 1, 2, 3 };
Console.WriteLine(list.BuildString(", "));

Answer 5

you can use, the System.Linq library; It is more efficient:

using System.Linq;
string str =string.Join(",", MyList.Select(x => x.NombreAtributo));

Answer 6

For approximately one gazillion solutions to a slightly more complicated version of this problem -- many of which are slow, buggy, or don't even compile -- see the comments to my article on this subject:

https://docs.microsoft.com/en-us/archive/blogs/ericlippert/comma-quibbling

and the StackOverflow commentary:

Eric Lippert's challenge "comma-quibbling", best answer?