Indexers and Overloading

A property declaration, which contains parameters is said to be an indexer. Declaration of an indexer permits it to be used in the same way as an array.

property-indexers:

[ property-indexer-list ]

property-indexer-list

property-indexer

property-indexer-list ; property-indexer

property-indexer:

identifier : type

Declaration of the property parameter is similar to method parameter declaration. The Out and Var modifiers cannot be used when determining property parameters.

It is a compile error for an indexer accessor to declare a local variable with the same name as an indexer parameter.

Parameterized properties overloading is permitted, that is, declaring several properties with the same name but different parameters signatures. In this case, the same rules are applied to names declaration as for overloaded method names declaration.

Example

Class IndexProperty
    i: array Of integer;

    Constructor IndexProperty(Length: integer);
    Begin
        i := New integer[Length];
    End Constructor;

    Public Property Item[Index: integer]: integer
        Get
        Begin
            Return i[Index];
        End Get
        Set
        Begin
            i[Index] := Value;
        End Set
    End Property;

End Class;

Sub Test();
Var
    Obj: IndexProperty = New IndexProperty(1);
Begin
    Obj.Item[0] := 100;
End Sub;