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Indexer Definitions on Interface Types

Finally, understand that indexers can be defined on a given .NET interface type to allow supporting

types to provide a custom implementation. Such an interface is as follows:

public interface IStringContainer

{

// This interface defines an indexer that returns

// strings based on a numerical index.

string this[int index] { get; set; }

}

With this interface definition, any class or structure that implements this interface must now

support a read/write indexer that manipulates subitems using a numerical value. As well, you could

design a generic interface where the type indexer allows the implementer to determine what will be

used to get or set the subobjects:

public interface IStringContainer

{

string this[int Key] { get; set; }

}

Here would be an implementation using a numerical indexer:

class MyStrings : IStringContainer

{

string[] strings = { "First", "Second" };

public string this[int Key]

{

get

{

return strings[Key];

}

set

{

strings[Key] = value;

}

}

}