Could someone tell me if it's possible (and if so, how) to call an
explicitly-implemented interface method from a subclass? I have a class in
which I have to explicity implement some methods, but my subclasses, which
should use them, cannot call them. I'm not sure if it just isn't possible
due to visibility or if I just don't have the syntax right. I can't make
the methods protected, as the compiler complains (although the documentation
for the error only says it's true of the "public" accessor, "protected" also
doesn't work, but when they use the default accessor, I can't get the
compiler to see the methods.
5  2433 
Keith,
I am curious, since it is an interface implementation, why not just cast
the "this" pointer to the interface and make the call? Or do you mean you
want to call the base implementation?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message
news:eU******** ********@TK2MSF TNGP12.phx.gbl. .. Could someone tell me if it's possible (and if so, how) to call an
explicitly-implemented interface method from a subclass? I have a class
in which I have to explicity implement some methods, but my subclasses, which
should use them, cannot call them. I'm not sure if it just isn't possible
due to visibility or if I just don't have the syntax right. I can't make
the methods protected, as the compiler complains (although the
documentation for the error only says it's true of the "public" accessor, "protected"
also doesn't work, but when they use the default accessor, I can't get the
compiler to see the methods.
Hmmm...I tried this morning, but couldn't get it to work, but now it *is*
compiling (I hadn't dosed up with caffeine yet, so I could have been missing
something obvious). One major issue I am having that could have played a
role is that due to my hierarchy, I am having to do some delayed iface
implementations in subclasses (IDictionary.Ge tEnumerator vs.
IEnumerable.Get Enumerator is the primary culprit). Because I don't
implement ICollection at the base level, I am doing a lot of weird
implementations of my various methods. I'm going to rewrite my base classes
from scratch to get a cleaner look at my methods, and if things still aren't
working, I'll post actual code (right now, my code is too verbose to really
be postable within the context of this thread).
Thanks for the help!
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:uY******** ******@tk2msftn gp13.phx.gbl... Keith,
I am curious, since it is an interface implementation, why not just
cast the "this" pointer to the interface and make the call? Or do you mean you
want to call the base implementation?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message
news:eU******** ********@TK2MSF TNGP12.phx.gbl. .. Could someone tell me if it's possible (and if so, how) to call an
explicitly-implemented interface method from a subclass? I have a class
in which I have to explicity implement some methods, but my subclasses,
which should use them, cannot call them. I'm not sure if it just isn't
possible due to visibility or if I just don't have the syntax right. I can't
make the methods protected, as the compiler complains (although the
documentation for the error only says it's true of the "public" accessor, "protected"
also doesn't work, but when they use the default accessor, I can't get the
compiler to see the methods.
Here's a problem I'd forgotten about that further complicates things: My
hierarchy is like so:
abstract class EventfulCollect ion: ICollection
abstract class EventfulListCol lection: IList (note to MS: FXCop flags
"EventfulLI st" as wrong because it implements ICollection and should
therefore end in "Collection ". Why does FXCop not realize that it actually
implements the subinterface IList and let me name the thing IList? .Net
itself breaks this rule with ArrayList!)
The problem this causes is that I must declare ICollection.Cop yTo(...), but
I don't want to implement the methods here, allowing my subclasses (some are
ILists, others are IDictionaries) to implement it themselves (and it isn't
just this method or this interface). So I can't say:
protected abstract CopyTo(...);
but I don't want to say:
ICollection.Cop yTo(...) {...} because then I'm implementing code that I
don't want to implement here (EventfulCollec tion has no private collection,
deferring that until the subclasses, so I have to implement it as a no-op,
which I HATE doing in OO). I want EventfulCollect ion to satisfy ICollection
responsibilitie s at an absolute minimum so that actual implementation occurs
in the subclasses. However, I still need to hide the implementations such
that my type-specific collections have their own implementations that are
overridden versions of the parent methods.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:uY******** ******@tk2msftn gp13.phx.gbl... Keith,
I am curious, since it is an interface implementation, why not just
cast the "this" pointer to the interface and make the call? Or do you mean you
want to call the base implementation?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message
news:eU******** ********@TK2MSF TNGP12.phx.gbl. .. Could someone tell me if it's possible (and if so, how) to call an
explicitly-implemented interface method from a subclass? I have a class
in which I have to explicity implement some methods, but my subclasses,
which should use them, cannot call them. I'm not sure if it just isn't
possible due to visibility or if I just don't have the syntax right. I can't
make the methods protected, as the compiler complains (although the
documentation for the error only says it's true of the "public" accessor, "protected"
also doesn't work, but when they use the default accessor, I can't get the
compiler to see the methods.
Keith,
I've had this problem as well. I think that the best way to get around
it (although the most tedious) is to have abstract methods on the base class
which the implementation of the interface calls. Then, your sub classes
would just override the abstract methods, and you shouldn't have a problem
then.
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message
news:eS******** ******@TK2MSFTN GP12.phx.gbl... Here's a problem I'd forgotten about that further complicates things: My
hierarchy is like so:
abstract class EventfulCollect ion: ICollection
abstract class EventfulListCol lection: IList (note to MS: FXCop flags
"EventfulLI st" as wrong because it implements ICollection and should
therefore end in "Collection ". Why does FXCop not realize that it
actually implements the subinterface IList and let me name the thing IList? .Net
itself breaks this rule with ArrayList!)
The problem this causes is that I must declare ICollection.Cop yTo(...),
but I don't want to implement the methods here, allowing my subclasses (some
are ILists, others are IDictionaries) to implement it themselves (and it isn't
just this method or this interface). So I can't say:
protected abstract CopyTo(...);
but I don't want to say:
ICollection.Cop yTo(...) {...} because then I'm implementing code that I
don't want to implement here (EventfulCollec tion has no private
collection, deferring that until the subclasses, so I have to implement it as a no-op,
which I HATE doing in OO). I want EventfulCollect ion to satisfy
ICollection responsibilitie s at an absolute minimum so that actual implementation
occurs in the subclasses. However, I still need to hide the implementations such
that my type-specific collections have their own implementations that are
overridden versions of the parent methods.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:uY******** ******@tk2msftn gp13.phx.gbl... Keith,
I am curious, since it is an interface implementation, why not just
cast the "this" pointer to the interface and make the call? Or do you mean
you want to call the base implementation?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in
message news:eU******** ********@TK2MSF TNGP12.phx.gbl. .. Could someone tell me if it's possible (and if so, how) to call an
explicitly-implemented interface method from a subclass? I have a
class in which I have to explicity implement some methods, but my subclasses, which should use them, cannot call them. I'm not sure if it just isn't possible due to visibility or if I just don't have the syntax right. I can't make the methods protected, as the compiler complains (although the
documentation for the error only says it's true of the "public" accessor,
"protected" also doesn't work, but when they use the default accessor, I can't get the
compiler to see the methods.
The difficulty there (and I don't know if this is really the fault of the
language or the design of the hierarchy) is that I can't expose
IEnumerable.Get Enumerator() because my dictionary-based implementation has
to expose it as IDictionary.Get Enumerator(), which has a different return
type, so the dictionary version cannot expose both methods (unless one is an
explicity definition, which means I have to implement what should be
abstract)
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote in
message news:OR******** *****@TK2MSFTNG P10.phx.gbl... Keith,
I've had this problem as well. I think that the best way to get
around it (although the most tedious) is to have abstract methods on the base
class which the implementation of the interface calls. Then, your sub classes
would just override the abstract methods, and you shouldn't have a problem
then.
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message
news:eS******** ******@TK2MSFTN GP12.phx.gbl... Here's a problem I'd forgotten about that further complicates things:
My hierarchy is like so:
abstract class EventfulCollect ion: ICollection
abstract class EventfulListCol lection: IList (note to MS: FXCop flags
"EventfulLI st" as wrong because it implements ICollection and should
therefore end in "Collection ". Why does FXCop not realize that it
actually implements the subinterface IList and let me name the thing IList? .Net
itself breaks this rule with ArrayList!)
The problem this causes is that I must declare ICollection.Cop yTo(...),
but I don't want to implement the methods here, allowing my subclasses (some
are ILists, others are IDictionaries) to implement it themselves (and it
isn't just this method or this interface). So I can't say:
protected abstract CopyTo(...);
but I don't want to say:
ICollection.Cop yTo(...) {...} because then I'm implementing code that I
don't want to implement here (EventfulCollec tion has no private
collection, deferring that until the subclasses, so I have to implement it as a
no-op, which I HATE doing in OO). I want EventfulCollect ion to satisfy
ICollection responsibilitie s at an absolute minimum so that actual implementation
occurs in the subclasses. However, I still need to hide the implementations
such that my type-specific collections have their own implementations that
are overridden versions of the parent methods.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard .caspershouse.c om> wrote
in message news:uY******** ******@tk2msftn gp13.phx.gbl... Keith,
I am curious, since it is an interface implementation, why not
just cast the "this" pointer to the interface and make the call? Or do you mean
you want to call the base implementation?
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Keith Patrick" <ri************ *******@nospamh otmail.com> wrote in message news:eU******** ********@TK2MSF TNGP12.phx.gbl. ..
> Could someone tell me if it's possible (and if so, how) to call an
> explicitly-implemented interface method from a subclass? I have a class in
> which I have to explicity implement some methods, but my subclasses,
which > should use them, cannot call them. I'm not sure if it just isn't
possible > due to visibility or if I just don't have the syntax right. I can't
make > the methods protected, as the compiler complains (although the
documentation
> for the error only says it's true of the "public" accessor, "protected" also
> doesn't work, but when they use the default accessor, I can't get
the > compiler to see the methods.
>
>
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