Tài liệu Indexers in Interfaces pdf

Indexers in Interfaces You can declare indexers in an interface. To do this, specify the get and/or set keyword, but replace the body of the get or set accessor with a semicolon. Any class or struct that implements the interface must implement the indexer accessors declared in the interface. For example: interface IRawInt { bool this [ int index ] { get; set; } } struct RawInt : IRawInt { public bool this [ int index ] { get { } set { } } } If you implement the interface indexer in a class, you can declare the indexer implementations as virtual. This allows further derived classes to override the get and set accessors. For example: class RawInt : IRawInt { public virtual bool this [ int index ] { get { } set { } } } You can also choose to implement an indexer by using the explicit interface implementation syntax covered in Chapter 12, “Working with Inheritance.” An explicit implementation of an indexer is non-public and non-virtual (and so cannot be overridden). For example: struct RawInt : IRawInt { bool IRawInt.this [ int index ] { get { } set { } } } . Indexers in Interfaces You can declare indexers in an interface. To do this, specify the get and/or set. implements the interface must implement the indexer accessors declared in the interface. For example: interface IRawInt { bool this [ int index ] { get;