[Mono-list] A question about interfaces

Peter Wu peterwu@whu.ca
Fri, 6 Feb 2004 22:20:32 -0500

On Sat, Feb 07, 2004 at 02:44:48AM +0000, Rodolfo Campero wrote:

> Hello all,
> I have a question about interfaces. I tried to compile the following 
> program:
> <demo code snipped>
> but I got a CS0122 error:
> 	interfaces.cs(16) error CS0122: `InterfaceTests.IBottom.Count' is 
> inaccessible due to its protection level
> 	Compilation failed: 1 error(s), 0 warnings
> I wonder why IBottom.Count is inaccessible, given the fact that neither 
> ILeft nor IRight hide this property.
> I've read the documentation, and in ECMA-334 C# Language Specification, 
> section 20.1.2: Base interfaces, there is a similar example involving 
> IControl, ITextBox, IListBox and IComboBox, and the example states:
> "the IComboBox interface above inherits members SetText and SetItems as 
> well as Paint." In the example, Paint is defined in the basic interface 
> (IControl).
> And then in 20.2, "The members of an interface are the members inherited 
> from the base interfaces and the members declared by the interface itself."
> From 20.4.2: "When a class implements multiple interfaces that have the 
> same base interface, there can be only one implementation of the base 
> interface."
> Apparently the property Count in my example shouldn't be hidden in the 
> interface IBottom, yet I'm getting an error. Is this a bug in mcs or am I 
> missing something?

Your code is compiled successfully under MS C# Compiler. I would think
this is a bug in mono.

Peter Wu
Powered by Gentoo Linux 2.4.22