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String.IndexOf Method (String)

Reports the index of the first occurrence of the specified String in this instance.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

public int IndexOf (
	string value
)
public int IndexOf (
	String value
)
public function IndexOf (
	value : String
) : int

Parameters

value

The String to seek.

Return Value

The index position of value if that string is found, or -1 if it is not. If value is Empty, the return value is 0.
Exception typeCondition

ArgumentNullException

value is a null reference (Nothing in Visual Basic).

Index numbering starts from zero.

This method performs a word (case-sensitive and culture-sensitive) search using the current culture. The search begins at the first character position of this instance and continues until the last character position.

The following code exampled demonstrates the IndexOf method.

using System;

public class InsertTest {
    public static void Main() {

        string animal1 = "fox";
        string animal2 = "dog";

        string strTarget = String.Format("The {0} jumped over the {1}.", animal1, animal2);

        Console.WriteLine("The original string is:{0}{1}{0}", Environment.NewLine, strTarget);

        Console.Write("Please enter an adjective (or a group of adjectives) to describe the {0}: ==> ", animal1);
        string adj1 = Console.ReadLine();

        Console.Write("Please enter an adjective (or a group of adjectives) to describe the {0}: ==> ", animal2);    
        string adj2 = Console.ReadLine();

        adj1 = adj1.Trim() + " ";
        adj2 = adj2.Trim() + " ";

        strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1);
        strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2);

        Console.WriteLine("{0}The final string is:{0}{1}", Environment.NewLine, strTarget);
    }
}

import System.*;

public class InsertTest
{
    public static void main(String[] args)
    {
        String animal1 = "fox";
        String animal2 = "dog";

        String strTarget = String.Format("The {0} jumped over the {1}.", 
            animal1, animal2);
        Console.WriteLine("The original string is:{0}{1}{0}", 
            Environment.get_NewLine(), strTarget);
        Console.Write("Please enter an adjective (or a group of adjectives) "
            + "to describe the {0}: ==> ", animal1);
        String adj1 = Console.ReadLine();

        Console.Write("Please enter an adjective (or a group of adjectives) "
            + "to describe the {0}: ==> ", animal2);
        String adj2 = Console.ReadLine();

        adj1 = adj1.Trim() + " ";
        adj2 = adj2.Trim() + " ";

        strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1);
        strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2);
        Console.WriteLine("{0}The final string is:{0}{1}", 
            Environment.get_NewLine(), strTarget);
    } //main
} //InsertTest

import System;

public class InsertTest {
    public static function Main() : void {

        var animal1 : String = "fox";
        var animal2 : String = "dog";

        var strTarget : String = String.Format("The {0} jumped over the {1}.", animal1, animal2);

        Console.WriteLine("The original string is:{0}{1}{0}", Environment.NewLine, strTarget);

        Console.Write("Please enter an adjective (or a group of adjectives) to describe the {0}: ==> ", animal1);
        var adj1 : String = Console.ReadLine();

        Console.Write("Please enter an adjective (or a group of adjectives) to describe the {0}: ==> ", animal2);    
        var adj2 : String = Console.ReadLine();

        adj1 = adj1.Trim() + " ";
        adj2 = adj2.Trim() + " ";

        strTarget = strTarget.Insert(strTarget.IndexOf(animal1), adj1);
        strTarget = strTarget.Insert(strTarget.IndexOf(animal2), adj2);

        Console.WriteLine("{0}The final string is:{0}{1}", Environment.NewLine, strTarget);
    }
}
InsertTest.Main();

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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