Class: ArrayList

Namespace: System.Collections

Library: mscorlib.dll

The .NET API has a set of Classes very useful. At some of the the next lessons we will see a resume of the members (properties, methods etc.) of the more importants. It's not a complete "Reference". If you don't find what you need, here, try the official SDK Documentation.

For some members we will present a little exercice, a little test. The Visual C# Express has a good tool to be used for tests of little pieces of code. Open it and select: File | New Project | Console Application | OK and you will have a file Program.cs to be used to type your code .

For the compilation select: Debug | Start Without Debugging and will open a black window having the program running.



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An ArrayList has only one dimension, accept objects, strings etc. like elements and has an undefined capacity. But it's created having 16 empty elements and will have increments of 16 elements each.

The index of the first element is: 0 (zero).

IMPORTANT: The library mscorlib.dll doesn't need to be declared at the .CSPROJ file.

Let's go to see some methods and properties:

Add(something)

This method adds a new element and returns the new quantity of elements of the ArrayList;

Example:

Clear()

Contains(something)

Example:

Only beeing a String the value can be tested.

GetRange(int init, int n)

Returns a new ArrayList having the n elements from init included.

Insert(int i, something)

Inserts an element at the i position.

LastIndexOf(something)

Returns the position of the last element having the value something.

Remove(something)

RemoveAt(int i)

Reverse()

Sort()

Example:

And, finally, a property having the quantity of elements:

Count 



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