The Substring() method returns a substring from the given string.
Example
using System;
namespace CsharpString {
class Test {
public static void Main(string [] args) {
string text = "C# is fun";
// returns substring of length 3 from index 6 Console.WriteLine(text.Substring(6, 3));Console.ReadLine(); } } } // Output: funSubstring() Syntax
The syntax of the string Substring() method is:
Substring(int startIndex, int length)
Here, Substring() is a method of class String.
Substring() Parameters
The Substring() method takes the following parameters:
- startIndex - the beginning index of the substring
- length - (optional) - length of the substring
Substring() Return Value
The Substring() method returns a substring from the given string.
Example 1: C# Substring() Without Length
using System;
namespace CsharpString {
class Test {
public static void Main(string [] args) {
string text = "Programiz";
// returns substring from the second character string result = text.Substring(1);Console.WriteLine(result); Console.ReadLine(); } } }
Output
rogramiz
Notice this line in the above example:
string result = text.Substring(1);
The code text.Substring(1) returns the substring from the second character of "Programiz".
Example 2: C# Substring() With Length
using System;
namespace CsharpString {
class Test {
public static void Main(string [] args) {
string text = "Programiz is for programmers";
// returns substring of length 9 from the first character string result = text.Substring(0, 9);Console.WriteLine(result); Console.ReadLine(); } } }
Output
Programiz
Notice this line in the above example:
string result = text.Substring(0, 9);
Here,
- 0 (the first character of text) is the beginning index of the substring
- 9 is the length of the substring
This gives us the substring "Programiz".
Example 3: C# Substring() Before Specific Character
using System;
namespace CsharpString {
class Test {
public static void Main(string [] args) {
string text = "C#. Programiz";
// returns substring from index 0 to index before '.' string result = text.Substring(0, text.IndexOf('.'));Console.WriteLine(result); Console.ReadLine(); } } }
Output
C#
Here, text.IndexOf('.') gives the length of the substring, which is the index of '.'.