String Manipulation

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 the System.String class.

Creating a String Object

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

Example

using System;

namespace StringApplication {

   class Program {

      static void Main(string[] args) {

         //from string literal and string concatenation

         string fname, lname;

         fname = "Rowan";

         lname = "Atkinson";

         char []letters= { 'H', 'e', 'l', 'l','o' };

         string [] sarray={ "Hello", "From", "Tutorials", "Point" };

         string fullname = fname + lname;

         Console.WriteLine("Full Name: {0}", fullname);

         //by using string constructor { 'H', 'e', 'l', 'l','o' };

         string greetings = new string(letters);

         Console.WriteLine("Greetings: {0}", greetings);

         //methods returning string { "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);

Properties of the String Class

Chars - Gets the Char object at a specified position in the current String object.
Length - Gets the number of characters in the current String object.

Comparing Strings

using System;

namespace StringApplication {

   class StringProg {

      static void Main(string[] args) {

         string str1 = "This is test";

         string str2 = "This is text";

         if (String.Compare(str1, str2) == 0) { // Using Compare method

            Console.WriteLine(str1 + " and " + str2 +  " are equal.");

         } else {

            Console.WriteLine(str1 + " and " + str2 + " are not equal.");

         Console.ReadKey() ;

String Contains String

using System;

namespace StringApplication {

   class StringProg {

      static void Main(string[] args) {

         string str = "This is test";

         if (str.Contains("test")) { // Using the Contains method

            Console.WriteLine("The sequence 'test' was found.");

         Console.ReadKey() ;

Getting a Substring

using System;

namespace StringApplication {

   class StringProg {

      static void Main(string[] args) {

         string str = "Last night I dreamt of San Pedro";

         Console.WriteLine(str);

         string substr = str.Substring(23); // Using the Substring method

         Console.WriteLine(substr);

Joining Strings

using System;

namespace StringApplication {

   class StringProg {

      static void Main(string[] args) {

         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"};

         string str = String.Join("\n", starray); // Using the Join method

         Console.WriteLine(str);

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