String Concatenation - few ways which most of us already knew.

There are many discussion about String Concatenation. In this article I am trying to address some known way to concat .Net string.

• using Concat() method of String class
• using Join() method of String class
• using StringBuilder class
• using Concatenation Operator (+)

I wrote a class(StringJoin) which is implemented all of the above points,

public class StringJoin

{
        public StringJoin() { }
 
        public string JoinUsingConcat(string firstItem, string secondItem)
        {
            return string.Concat(values: new[] { firstItem, secondItem });
        }
        public string JoinUsingConcat(string[] items)
        {
            return string.Concat(values: items);
        }
 
        public string JoinUsingJoin(string firstItem, string secondItem)
        {
            return string.Join(separator: string.Empty, value: new[] { firstItem, secondItem });
        }
        public string JoinUsingJoin(string[] items)
        {
            return string.Join(separator: string.Empty, value: items);
        }
 
 
        public string JoinUsingBuilder(string firstItem, string secondItem)
        {
            StringBuilder builder = new StringBuilder();
            builder.Append(value: firstItem).Append(value: secondItem);
            return builder.ToString();
        }
        public string JoinUsingBuilder(string[] items)
        {
            StringBuilder builder = new StringBuilder();
            foreach (string item in items)
                builder.Append(value: item);
            return builder.ToString();
        }
 
        public string JoinUsingConcatenationOperator(string firstItem, string secondItem)
        {
            return firstItem + secondItem;
        }
        public string JoinUsingConcatenationOperator(string[] items)
        {
            string result = string.Empty;
            foreach (string item in items)
                result += item;
            return result;
        }
}

and a Test class to test above code as below,


class Program

{
        static void Main(string[] args)
        {
            string[] items = new string[] { "One-", "Two-", "Three" };
            StringJoin stringJoin = new StringJoin();
 
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingConcat("One-", "Two"));
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingConcat(items));
 
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingJoin("One-", "Two"));
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingJoin(items));
 
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingBuilder("One-", "Two"));
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingBuilder(items));
 
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingConcatenationOperator("One-", "Two"));
            Console.WriteLine("Result : {0}", stringJoin.JoinUsingConcatenationOperator(items));
 
            Console.ReadKey();
        }
}

and the output of the code is as below,

There would be some other ways to join .Net string. Happy to learn others.