Convert a List of strings to a comma-separated string in C#

This article illustrates the different techniques to convert a List<string> to a comma-separated string in C#.

1. Using `String.Join()` method

The standard solution to convert a List<string> to a comma-separated string in C# is using the string.Join() method. It concatenates members of the specified collection using the specified delimiter between each item.

using System;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

List<string> strings = new List<string> { "a", "b", "c" };

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

Console.WriteLine(concat); // a,b,c

}

Download Run Code

2. Using `Enumerable.Aggregate()` method

Alternatively, you can use the LINQ Aggregate() method, which applies an accumulator function on each item of the calling sequence. This can be used as follows to concatenate each member of the list. Note that you need to add the System.Linq namespace.

using System;

using System.Linq;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

List<string> strings = new List<string> { "a", "b", "c" };

string concat = strings.Aggregate((x, y) => x + "," + y);

Console.WriteLine(concat); // a,b,c

}

Download Run Code

That’s all about converting a List<string> to a comma-separated string in C#.

Convert a List of strings to a comma-separated string in C#

1. Using String.Join() method

2. Using Enumerable.Aggregate() method

Share this:

1. Using `String.Join()` method

2. Using `Enumerable.Aggregate()` method