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 -
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);
}
}QPRPQ
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