Get the number of elements : ArrayList « Data Structure « C# / CSharp Tutorial

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C# / CSharp Tutorial » Data Structure » ArrayList

11.21.2.Get the number of elements

using System; 

using System.Collections; 

 

class MainClass { 

  public static void Main() { 

    ArrayList al = new ArrayList(); 

     

    Console.WriteLine("Initial number of elements: " + al.Count); 

 

    Console.WriteLine("Adding 6 elements"); 

    // Add elements to the array list 

    al.Add('C'); 

    al.Add('A'); 

    al.Add('E'); 

    al.Add('B'); 

    al.Add('D'); 

    al.Add('F'); 

 

    Console.WriteLine("Number of elements: " + al.Count); 

  }

}

Initial number of elements: 0
Adding 6 elements
Number of elements: 6

11.21.ArrayList
	11.21.1.	Demonstrates the 3 constructors of ArrayList
	11.21.2.	Get the number of elements
	11.21.3.	Remove elements from ArrayList
	11.21.4.	Capacity and element count
	11.21.5.	Change contents using array indexing
	11.21.6.	Sort and search an ArrayList
	11.21.7.	Use enumerator to access list
	11.21.8.	Re-enumerate the list
	11.21.9.	Make an ArrayList Synchronized
	11.21.10.	Insert and remove at specific index
	11.21.11.	Clear an ArrayList
	11.21.12.	Create a string array and use the ICollection.CopyTo method to copy the contents of the ArrayList
	11.21.13.	Use ArrayList.ToArray to create an object array from the contents of the collection
	11.21.14.	Box ints into ArrayList
	11.21.15.	ArrayList: AddRange
	11.21.16.	Insert item to ArrayList by index
	11.21.17.	Use ArrayList copy constructor
	11.21.18.	IsFixedSize and IsReadOnly properties
	11.21.19.	Insert(), AddRange(), and InsertRange() methods
	11.21.20.	Use the SetRange() method to copy the elements from anotherStringArray to myArrayList, starting at index 0
	11.21.21.	Use the Contains() method to determine if the string 'text' is in the ArrayList
	11.21.22.	Use the IndexOf() and LastIndexOf() methods to display the first and last occurrence
	11.21.23.	Remove element 0, first 'text' element, and two elements starting at index 3
	11.21.24.	Use the Reverse() method to reverse myArrayList
	11.21.25.	Using the TrimToSize() method to reduce the capacity of ArrayList
	11.21.26.	Using the GetRange() method to get two elements from myArrayList, starting at index 1
	11.21.27.	Get an enumerator using the GetEnumerator() method and use it to read the elements in ArrayList
	11.21.28.	Use the Reset() method and access the first row again using MoveNext()
	11.21.29.	Sort arraylist using custom IComparer
	11.21.30.	Sort ArrayList using the default comparer and a custom comparer that reverses the sort order.
	11.21.31.	Filter int from ArrayList
	11.21.32.	extends ArrayList to create NameCollection
	11.21.33.	ArrayList Query

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