C # Indexer

1. Description

The indexer allows instances of classes or structures to be indexed like arrays. The indexer is similar to an attribute, but its accessors use parameters.

• You can use the indexer to create an index for an object in an array-like manner.

• GetAccessors return values.SetThe value allocated by the accessor.

• This keyword is used to define the indexer.

• The value keyword is used to defineSetThe value allocated by the indexer.

• The indexer does not need to index based on the integer value. It is up to you to decide how to define a specific search mechanism.

• The indexer can be overloaded.

• The indexer can have multiple parameters, for example, when accessing a two-dimensional array.

2. ExampleCode

Namespace csharpdemo {class program {static void main (string [] ARGs) {studentscore SC = new studentscore (); console. writeline ("score of the first student is {0}", SC [0]); console. readline () ;}/// <summary> // example of the indexer /// </Summary> public class studentscore {private double [] SC = {90, 88, 67, 41, 67, 72, 98}; private string [] names = {"Li", "Xu", "Zhang", "Wang", "Chen ", "Wu", "Hu"}; Public double this [int I] {get {return SC [I];} set {SC [I] = value ;}} // you can have multiple indexers. Public String This [string name] {get {return getname (name) ;}} private string getname (string name) is supported only when the parameters are different) {foreach (string s in names) {If (S = Name) {return s ;}} return string. empty ;}}}