indexer

indexer

1. nameof expression (C# reference)

A nameof expression produces the name of a variable, type, or member as the string constant:

Definition

2. Indexers (C# Programming Guide)

Indexers allow instances of a class or struct to be indexed just like arrays.

The indexed value can be set or retrieved without explicitly specifying a type or instance member. Indexers resemble properties except that their accessors take parameters.

The following example defines a generic class with simple get and set accessor methods to assign and retrieve values. The Program class creates an instance of this class for storing strings.

3. Using indexers (C# Programming Guide)

Indexers are a syntactic convenience that enable you to create a class, struct, or interface that client applications can access as an array.

The compiler will generate an Item property (or an alternatively named property if IndexerNameAttribute is present), and the appropriate accessor methods.

Indexers are most frequently implemented in types whose primary purpose is to encapsulate an internal collection or array.

For example, suppose you have a class TempRecord that represents the temperature in Fahrenheit as recorded at 10 different times during a 24-hour period. The class contains a temps array of type float[] to store the temperature values. By implementing an indexer in this class, clients can access the temperatures in a TempRecord instance as float temp = tempRecord[4] instead of as float temp = tempRecord.temps[4].

The indexer notation not only simplifies the syntax for client applications; it also makes the class, and its purpose more intuitive for other developers to understand.

To declare an indexer on a class or struct, use the this keyword, as the following example shows:

// Indexer declaration
public int this[int index]
{ // get and set accessors }
4. Indexers in C#

In this article, I am going to discuss Indexers in C# with Examples. Please read our previous article where we discussed How to make Optional Parameters in C#. As part of this article, we will discuss what indexers are and how to create and use indexers in C#.

Examples

5. Learning C# (Day 8): Indexers in C# (A Practical Approach)

OOP: Indexers in C# (A Practical Approach)

6. Indexers

Here we are going to introduce you to the concept of indexers in C#. Indexers can help simplify some programming aspects. Let us understand what these programming aspects are and then understand how indexers can help simplify them. To understand the programming aspects that indexers intend to simplify, we will go step by step with small programs.

7. C# Indexer with Examples

In c#, Indexer is a special type of property, and that allows instances of a class or structure to be indexed same like an array.

If we define an indexer for a class, then that class will behave like a virtual array, and we can access that class instance values without specifying a type or instance member using an array access operator ([]).

In c#, the indexer is same as the property, but the only difference is, the indexer will define this keyword along with the square bracket and parameters.

8. Multiple Indexers In a Class Using Interface Indexers

Using multiple indexers in a class using interface indexers.