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 { }
}

}