C# String

tutorial and example
tutorial and example

String can be defined as an array of characters. In C#, string is an object of System.String which represents sequence of characters. Strings can be concatenated, comparison, getting substring and many more.
In C#, using String and string doesn’t make any difference. both are the same except that the thing that String is a class while string is a keyword which is an alias for System.String class.

Defining String:

In C#, String can be defined by two ways:

  1. By using new keyword:
  2. By string literal

By using New keyword:

char[] ch={ ‘C ‘, ‘S ‘, ‘H ‘, ‘A ‘, ‘ R’, ‘ P’}  //array of characters

string s=new String(ch);

By String Literal:

String s= “CSHARP ”

C# String Example: Getting the string from the user

Output

C# String Example: using new keyword

Output

C# String class Methods:

C# String class provides various methods to deal with the string related operations.

Method Name Description
Clone() it makes the exact copy of the string
Compare(String,String) Compares two strings. Returns an integer which indicates their relative position in sort order
CompareOrdinal(String,String) Compare two string by comparing their relative char object numerically.
CompareTo(String) It is used to compare this instance with a specified String object. It indicates whether this instance precedes, follows, or appears in the same position in the sort order as the specified string.
Concat(string,string) It is used to concatenate two specified instances of String.
Contains(string) It checks whether the string object contains specified string. Returns Boolean value.
Copy(string) It makes the copy of the specified string.
CopyTo(Int32, Char[], Int32, Int32) It is used to copy a specified number of characters from a specified position in this instance to a specified position in an array of Unicode characters.
EndsWith(string) It is used to check that the end of this string instance matches the specified string.
Equals(string,string) It is used to determine that two specified String objects have the same value.
Format(string,Object) It is used to replace one or more format items in a specified string with the string representation of a specified object.
GetEnumerator() It is used to retrieve an object that can iterate through the individual characters in this string.
GetType() It is used to get the Type of the current instance.
GetHashCode() It returns the hash code for this string.
GetTypeCode() It is used to return the TypeCode for class String.
IndexOf(String) It is used to report the zero-based index of the first occurrence of the specified string in this instance.
Insert(Int32,String) It is used to return a new string in which a specified string is inserted at a specified index position.
Intern(String) It is used to retrieve the system’s reference to the specified String.
IsInterned(String) It is used to retrieve a reference to a specified String.
IsNormalized() It is used to indicate that this string is in Unicode normalization form C.
IsNullOrEmpty(string) It is used to indicate that the specified string is null or an Empty string.
IsNullOrWhiteSpace(string) It is used to indicate whether a specified string is null, empty, or consists only of white-space characters.
Join(string,string[]) It is used to concatenate all the elements of a string array, using the specified separator between each element.
LastIndexOf(char) It is used to report the zero-based index position of the last occurrence of a specified character within String.
LastInsexOfAny(char[]) It is used to report the zero-based index position of the last occurrence in this instance of one or more characters specified in a Unicode array.
Normalize() It is used to return a new string whose textual value is the same as this string, but whose binary representation is in Unicode normalization form C.
PadLeft(int32) It is used to return a new string that right-aligns the characters in this instance by padding them with spaces on the left.
PadRight(int32) It is used to return a new string that left-aligns the characters in this string by padding them with spaces on the right.
Remove(int32) It is used to return a new string in which all the characters in the current instance, beginning at a specified position and continuing through the last position, have been deleted.
Replace(string,string) It is used to return a new string in which all occurrences of a specified string in the current instance are replaced with another specified string.
Split(char[]) It is used to split a string into substrings that are based on the characters in an array.
Startswith(string) It is used to check whether the beginning of this string instance matches the specified string.
Substring(int32) It is used to retrieve a substring from this instance. The substring starts at a specified character position and continues to the end of the string.
ToCharArray() It is used to copy the characters in this instance to a Unicode character array.
ToLower() It is used to convert String into lowercase.
ToLowerInvarient() It is used to return convert String into lowercase using the casing rules of the invariant culture.
ToUpper() It is used to convert String into uppercase.
ToString() It is used to return instance of String.
TrimEnd(char[]) It Is used to remove all trailing occurrences of a set of characters specified in an array from the current String object.
TrimStart[char[]) It is used to remove all leading occurrences of a set of characters specified in an array from the current String object.