C# ArrayList IndexOf(Object)
Description
ArrayList IndexOf(Object) searches for the specified
Object and returns the zero-based index of the first occurrence within the
entire ArrayList.
Syntax
ArrayList.IndexOf(Object) has the following syntax.
public virtual int IndexOf(
Object value
)
Parameters
ArrayList.IndexOf(Object) has the following parameters.
value- The Object to locate in the ArrayList. The value can be null.
Returns
ArrayList.IndexOf(Object) method returns The zero-based index of the first occurrence of value within the entire ArrayList,
if found; otherwise, -1.
Example
The following code searches for the first occurrence of the duplicated value.
using System;/*w ww . jav a2 s.c om*/
using System.Collections;
public class SamplesArrayList
{
public static void Main()
{
ArrayList myAL = new ArrayList();
myAL.Add( "the" );
myAL.Add( "quick" );
myAL.Add( "brown" );
myAL.Add( "fox" );
myAL.Add( "jumps" );
myAL.Add( "over" );
myAL.Add( "the" );
String myString = "the";
int myIndex = myAL.IndexOf( myString );
Console.WriteLine( "The first occurrence of \"{0}\" is at index {1}.", myString, myIndex );
}
public static void PrintIndexAndValues(IEnumerable myList)
{
int i = 0;
foreach (Object obj in myList)
Console.WriteLine(" [{0}]: {1}", i++, obj);
}
}
The code above generates the following result.
