IndexOf Method of String
The string IndexOf method is useful to return an index
of the first occurrence of the specified character in the given string.
Generally, string IndexOf method will start searching for the
specified character starting from the Zero position and return the first
occurrence of the specified character in the given string.
In case, if you want to change the specified
character search starting position and to examine the only specified number of
character positions in a string, then we can do it by specifying the required start
position and number of character positions to search in string IndexOf method.
In C#, the string IndexOf() method will perform a case-sensitive search
to get the specified character position.
Syntax of IndexOf Method
Following is the syntax of defining a string IndexOf method to get the specified character
position.
public int
IndexOf(char ch, int startIndex)
public int
IndexOf(char ch, int startIndex, int count)
public int
IndexOf(char ch, StringComparison comparisonType)
public int IndexOf(string str)
public int
IndexOf(string str, int startIndex)
public int
IndexOf(string str, int startIndex, int count)
public int
IndexOf(string str, StringComparison
comparisonType)
If you observe syntaxes, the IndexOf method will
return the index position of a specified character or a string in
the given string and
we can change the starting position of characters search and length of
characters to search based on our requirements.
The string IndexOf method will
return an index position of specified character if that character is found. In
case, the specified character is not found, then it will return -1.
C# example of IndexOf Method
Following is the example of using the
string IndexOf() method to
return an index position of a specified character in the given string.
using System;
using System.Collections.Generic;
namespace CsharpnaijaTutorial
{
class Program
{
static void Main(string[] args)
{
string name = "Musa Sule Gadabs";
Console.WriteLine($"Character s Index Position: {name.IndexOf("s")}");
Console.WriteLine($"Ignore Case: {name.IndexOf("s", StringComparison.OrdinalIgnoreCase)}");
Console.WriteLine($"Change Search Start Position: {name.IndexOf("s", 5)}");
Console.WriteLine($"Characters Length Reult: {name.IndexOf("s", 5, 3)}");
Console.WriteLine($"String Position: {name.IndexOf("Sule")}");
Console.WriteLine("\nPress Enter Key to Exit..");
Console.ReadLine();
}
}
}
As you
see from the above example, we used a IndexOf() method to
find the index position of defined character in string “Musa
Sule Gadabs” with multiple conditions.
When you execute the above C#
program, you will get the result as shown below.
 |
| Output window |
Thank you
References
1. Tutlane
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