C# - ArrayList Class
It represents an ordered collection of an object that can be indexed individually. It is basically an alternative to an array. However, unlike array you can add and remove items from a list at a specified position using an index and the array resizes itself automatically. It also allows dynamic memory allocation, adding, searching and sorting items in the list.
Methods and Properties of ArrayList Class
The following table lists some of the commonly used properties of the ArrayList class
1 | Capacity Gets or sets the number of elements that the ArrayList can contain. |
2 | Count Gets the number of elements actually contained in the ArrayList. |
3 | IsFixedSize Gets a value indicating whether the ArrayList has a fixed size. |
4 | IsReadOnly Gets a value indicating whether the ArrayList is read-only. |
5 | Item Gets or sets the element at the specified index. |
The following table lists some of the commonly used methods of the ArrayList class
1 | public virtual int Add[object value]; Adds an object to the end of the ArrayList. |
2 | public virtual void AddRange[ICollection c]; Adds the elements of an ICollection to the end of the ArrayList. |
3 | public virtual void Clear[]; Removes all elements from the ArrayList. |
4 | public virtual bool Contains[object item]; Determines whether an element is in the ArrayList. |
5 | public virtual ArrayList GetRange[int index, int count]; Returns an ArrayList which represents a subset of the elements in the source ArrayList. |
6 | public virtual int IndexOf[object]; Returns the zero-based index of the first occurrence of a value in the ArrayList or in a portion of it. |
7 | public virtual void Insert[int index, object value]; Inserts an element into the ArrayList at the specified index. |
8 | public virtual void InsertRange[int index, ICollection c]; Inserts the elements of a collection into the ArrayList at the specified index. |
9 | public virtual void Remove[object obj]; Removes the first occurrence of a specific object from the ArrayList. |
10 | public virtual void RemoveAt[int index]; Removes the element at the specified index of the ArrayList. |
11 | public virtual void RemoveRange[int index, int count]; Removes a range of elements from the ArrayList. |
12 | public virtual void Reverse[]; Reverses the order of the elements in the ArrayList. |
13 | public virtual void SetRange[int index, ICollection c]; Copies the elements of a collection over a range of elements in the ArrayList. |
14 | public virtual void Sort[]; Sorts the elements in the ArrayList. |
15 | public virtual void TrimToSize[]; Sets the capacity to the actual number of elements in the ArrayList. |
Example
The following example demonstrates the concept
When the above code is compiled and executed, it produces the following result
Adding some numbers: Capacity: 8 Count: 7 Content: 45 78 33 56 12 23 9 Content: 9 12 23 33 45 56 78Useful Video Courses
2D Games Development using Unity and C#
119 Lectures 23.5 hours
Raja Biswas
C# Console and Windows Forms Development with LINQ & ADO.NET
37 Lectures 13 hours
Trevoir Williams
Fixing Common Errors in Unity C#
16 Lectures 1 hours
Peter Jepson
ASP.NET CORE and C# REST API With Real World Projects
159 Lectures 21.5 hours
Ebenezer Ogbu
AutoCAD Programming Using C#.NET - Beginner Course
193 Lectures 17 hours
Arnold Higuit
The Beginner's Guide to C#
24 Lectures 2.5 hours
Eric Frick