Question

How to use StringBuilder to combine strings from string array in C#

Answer 1

using System;
using System.Text;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] arr = { "c#", "java", "c", "c++" };

            StringBuilder sb = new StringBuilder();
            foreach (string s in arr)
            {
                sb.Append(s).Append(",");
            }
            string str =  sb.ToString().TrimEnd(new char[] { ',' });

            Console.WriteLine(str);
        }
    }
}

/*
run:

c#,java,c,c++

*/

 

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