Swap characters of string in C#

To swap the characters of a string, use the Select method.

First, let's say our string is -

string str = "PQRQP";

Now you need to swap every occurrence of P with Q and Q with P -

str.Select(a=> a == 'P' ? 'Q' : (a=='Q' ? 'P' : a)).ToArray();

above Characters replaced.

Let’s see the complete code -

Example

Live Demonstration

using System;
using System.Linq;

public class Program {
   public static void Main() {

      string str = "PQRQP";

      var res= str.Select(a=> a == 'P' ? 'Q' : (a=='Q' ? 'P' : a)).ToArray();
      str = new String(res);

      Console.WriteLine(str);
   }
}

Output

QPRPQ

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