C# | Remove the first occurrence of a specific object from the ArrayList (original) (raw)

Last Updated : 20 Nov, 2019

ArrayList represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. It also allows dynamic memory allocation, adding, searching and sorting items in the list. ArrayList.Remove(Object) method is used to remove the first occurrence of a specific object from the ArrayList.Properties:

Syntax:

public virtual void Remove (object obj);

Here, obj is the Object to remove from the ArrayList. The value can be null.Exceptions: This method will give NotSupportedException if the ArrayList is read-only or has a fixed size. Below given are some examples to understand the implementation in a better way:Example 1:

CSHARP `

// C# code to remove the first // occurrence of a specific // object from the ArrayList using System; using System.Collections;

class GFG { 

// Driver code 
public static void Main() 
{ 

    // Creating an ArrayList 
    ArrayList myList = new ArrayList(10); 

    // Adding elements to ArrayList 
    myList.Add("C"); 
    myList.Add("C#"); 
    myList.Add("Java"); 
    myList.Add("C#"); 
    myList.Add("PHP"); 
    myList.Add("C#"); 

    // Displaying the elements in ArrayList 
    Console.WriteLine("The elements in ArrayList initially are :"); 

    foreach(string str in myList) 
        Console.WriteLine(str); 

    // Removing the first 
    // occurrence of C#
    myList.Remove("C#"); 

    // Displaying the elements in ArrayList 
    Console.WriteLine("The elements in ArrayList are :"); 

    foreach(string str in myList) 
        Console.WriteLine(str); 
}

}

`

Output:

The elements in ArrayList initially are : C C# Java C# PHP C# The elements in ArrayList are : C Java C# PHP C#

Example 2:

CSHARP `

// C# code to remove the first // occurrence of a specific // object from the ArrayList using System; using System.Collections;

class GFG { 

// Driver code 
public static void Main() 
{ 

    // Creating an ArrayList 
    ArrayList myList = new ArrayList(10); 

    // Adding elements to ArrayList 
    myList.Add("Geeks"); 
    myList.Add("Noida"); 
    myList.Add("Classes"); 
    myList.Add("GFG"); 
    myList.Add("DS"); 
    myList.Add("Algorithms"); 

    // Displaying the elements in ArrayList 
    Console.WriteLine("The elements in ArrayList initially are :"); 

    foreach(string str in myList) 
        Console.WriteLine(str); 

    // Removing the first 
    // occurrence of HTML
    // As HTML is not present so
    // it return the ArrayList as it is
    myList.Remove("HTML"); 

    // Displaying the elements in ArrayList 
    Console.WriteLine("The elements in ArrayList are :"); 

    foreach(string str in myList) 
        Console.WriteLine(str); 
}

}

`

Output:

The elements in ArrayList initially are : Geeks Noida Classes GFG DS Algorithms The elements in ArrayList are : Geeks Noida Classes GFG DS Algorithms

Note:

Reference:

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