C# STRINGS

In C#, you can use strings as array of characters. However, more common practice is to use the string keyword to declare a string variable. The string keyword is an alias for theSystem.String class.

Creating a String Object

You can create string object using one of the following methods:

• By assigning a string literal to a String variable
• By using a String class constructor
• By using the string concatenation operator (+)
• By retrieving a property or calling a method that returns a string
• By calling a formatting method to convert a value or an object to its string representation

using System;

namespace ConsoleApp1
{
    class MyArray
    {
        static void Main(string[] args)
        {
            // from string literal and string concatenation
            string fname, lname;
            fname = "Rowan";
            lname = "Atkinson";
            string fullname = fname + lname;
            Console.WriteLine("Full Name: {0}", fullname);
            //by using string constructor
            char[] letters = { 'H', 'e', 'l', 'l', 'o' };
            string greetings = new string(letters);
            Console.WriteLine("Greetings: {0}", greetings);
            //methods returning string
            string[] sarray = { "Hello", "From", "Tutorials", "Point" };
            string message = String.Join(" ", sarray);
            Console.WriteLine("Message: {0}", message);
            //formatting method to convert a value 
            DateTime waiting = new DateTime(2012, 10, 10, 17, 58, 1);
            string chat = String.Format("Message sent at {0:t} on {0:D}",waiting);
            Console.WriteLine("Message: {0}", chat);
            Console.ReadKey();
            //Full Name: Rowan Atkinson
            //Greetings: Hello
            //Message: Hello From Tutorials Point
            //Message: Message sent at 5:58 PM on Wednesday, October 10, 2012
        }
    }
}

Properties of the String Class

Methods of the String Class

using System;

namespace ConsoleApp1
{
    class MyArray
    {
        static void Main(string[] args)
        {
            //Comparing Strings:
            Console.WriteLine("\nComparing Strings:");
            string str1 = "This is test";
            string str2 = "This is text";
            if (String.Compare(str1, str2) == 0)
            {
                Console.WriteLine(str1 + " and " + str2 + " are equal.");
            }
            else
            {
                Console.WriteLine(str1 + " and " + str2 + " are not equal.");
            }
            //This is test and This is text are not equal.

            //String Contains String:
            Console.WriteLine("\nString Contains String:");
            string str = "This is test";
            if (str.Contains("test"))
            {
                Console.WriteLine("The sequence 'test' was found.");
            }
            //The sequence 'test' was found.

            //Getting a Substring
            Console.WriteLine("\nGetting a Substring");
            str = "Last night I dreamt of San Pedro";
            Console.WriteLine(str);
            string substr = str.Substring(23);
            Console.WriteLine(substr);
            //San Pedro

            //Joining Strings:
            Console.WriteLine("\nJoining Strings");
            string[] starray = new string[]{"Down the way nights are dark",
                "And the sun shines daily on the mountain top", 
                "I took a trip on a sailing ship",
                "And when I reached Jamaica",
                "I made a stop"};
            str = String.Join("\n", starray);
            Console.WriteLine(str);
            //Down the way nights are dark
            //And the sun shines daily on the mountain top
            //I took a trip on a sailing ship
            //And when I reached Jamaica
            //I made a stop

            Console.ReadKey();
        }
    }
}