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As you know, array indexing is performed using the [ ] operator It is possible to define the [ ] operator for classes that you create, but you don t use an operator method Instead, you create an indexer An indexer allows an object to be indexed like an array The main use of indexers is to support the creation of specialized arrays that are subject to one or more constraints However, you can use an indexer for any purpose for which an array-like syntax is beneficial Indexers can have one or more dimensions We will begin with onedimensional indexers

A simple one-dimensional indexer has this general form: element-type this[int index] { // The get accessor get { // return the value speci ed by index } // The set accessor set { // set the value speci ed by index } }

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Here, element-type is the element type of the indexer Thus, each element accessed by the indexer will be of type element-type This type corresponds to the element type of an array The parameter index receives the index of the element being accessed Technically, this parameter does not have to be of type int, but since indexers are typically used to provide array indexing, using an integer type is quite common Inside the body of the indexer two accessors are defined that are called get and set An accessor is similar to a method except that it does not declare a return type or parameters The accessors are automatically called when the indexer is used, and both accessors receive index as a parameter If the indexer is on the left side of an assignment statement, then the set accessor is called and the element specified by index must be set Otherwise, the get accessor is called and the value associated with index must be returned The set method also receives an implicit parameter called value, which contains the value being assigned to the specified index One of the benefits of an indexer is that you can control precisely how an array is accessed, heading off improper access Here is an example In the following program, the FailSoftArray class implements an array that traps boundary errors, thus preventing runtime exceptions if the array is indexed out-of-bounds This is accomplished by encapsulating the array as a private member of a class, allowing access to the array only through the indexer With this approach, any attempt to access the array beyond its boundaries can be prevented, with such an attempt failing gracefully (resulting in a soft landing rather than a crash ) Since FailSoftArray uses an indexer, the array can be accessed using the normal array notation.

// Use an indexer to create a fail-soft array using System; class FailSoftArray { int[] a; // reference to underlying array public int Length; // Length is public public bool ErrFlag; // indicates outcome of last operation // Construct array given its size public FailSoftArray(int size) { a = new int[size]; Length = size; } // This is the indexer for FailSoftArray public int this[int index] { // This is the get accessor get { if(ok(index)) { ErrFlag = false; return a[index]; } else { ErrFlag = true; return 0; } }

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Sometimes it is useful to read input from or write output to an array To do this, you will use MemoryStream MemoryStream is an implementation of Stream that uses an array of bytes for input and/or output MemoryStream defines several constructors Here is the one we will use: MemoryStream(byte[ ] buffer) Here, buffer is an array of bytes that will be used for the source and/or target of I/O requests The stream created by this constructor can be written to, read from, and supports Seek( ) When using this constructor, you must remember to make buffer large enough to hold whatever output you will be directing to it

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Here is a program that demonstrates the use of MemoryStream:

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