Delphi Compiler Error
E2206 Property overrides not allowed in interface type
Reason for the Error & Solution
A property which was declared in a base interface has been overridden in an interface extension.
program Produce;
type
Base = interface
function Reader : Integer;
function Writer(a : Integer);
property Value : Integer read Reader write Writer;
end;
Extension = interface (Base)
function Reader2 : Integer;
property Value Integer read Reader2;
end;
begin
end.
The error in the example is that Extension attempts to override the Value property.
program Solve;
type
Base = interface
function Reader : Integer;
function Writer(a : Integer);
property Value : Integer read Reader write Writer;
end;
Extension = interface (Base)
function Reader2 : Integer;
property Value2 Integer read Reader2;
end;
begin
end.
A solution to this error is to rename the offending property. Another, more robust, approach is to determine the original intent and restructure the system design to solve the problem.
