Sorry, but I am on a bit of a roll today.
I have just found that I can make a method private to my class, but then use
AddHandler in an external class to hook it up. Is that what people would
expect?
For example
<code>
Public Interface IMyClass
Sub MyMethod(ByVal sender As Object, e As EventArgs)
End Interface
Public Class MyClass
Implements IMyClass
' NOTE: this is declared Private
Private Sub MyMethod(ByVal sender As Object, e As EventArgs) Implements
IMyClass.MyMethod
' Do stuff
End Sub
End Class
Public Class MainClass
Public Event MyEvent(ByVal sender As Object, e As EventArgs)
Public Sub SetHandler()
Dim imc as IMyClass
imc = New MyClass
'*** This works. Should it? ***
AddHandler MyEvent, AddressOf imc.MyMethod
End Sub
End Class
</code>
Charles 7 1107
The point is that the interface is not private.
"Charles Law" wrote: Sorry, but I am on a bit of a roll today.
I have just found that I can make a method private to my class, but then use AddHandler in an external class to hook it up. Is that what people would expect?
For example
<code> Public Interface IMyClass Sub MyMethod(ByVal sender As Object, e As EventArgs) End Interface
Public Class MyClass
Implements IMyClass
' NOTE: this is declared Private Private Sub MyMethod(ByVal sender As Object, e As EventArgs) Implements IMyClass.MyMethod ' Do stuff End Sub End Class
Public Class MainClass
Public Event MyEvent(ByVal sender As Object, e As EventArgs)
Public Sub SetHandler()
Dim imc as IMyClass
imc = New MyClass
'*** This works. Should it? *** AddHandler MyEvent, AddressOf imc.MyMethod
End Sub
End Class </code>
Charles
Yes, but ...
Although the interface is not private, it seems incongruous that I should be
able to declare the method as private but still call it, albeit from an
event. Perhaps the compiler should insist that it be declared public before
it can be accessed publicly?
Charles
"Rulin Hong" <Ru*******@discussions.microsoft.com> wrote in message
news:64**********************************@microsof t.com... The point is that the interface is not private.
"Charles Law" wrote:
Sorry, but I am on a bit of a roll today.
I have just found that I can make a method private to my class, but then
use AddHandler in an external class to hook it up. Is that what people would expect?
For example
<code> Public Interface IMyClass Sub MyMethod(ByVal sender As Object, e As EventArgs) End Interface
Public Class MyClass
Implements IMyClass
' NOTE: this is declared Private Private Sub MyMethod(ByVal sender As Object, e As EventArgs)
Implements IMyClass.MyMethod ' Do stuff End Sub End Class
Public Class MainClass
Public Event MyEvent(ByVal sender As Object, e As EventArgs)
Public Sub SetHandler()
Dim imc as IMyClass
imc = New MyClass
'*** This works. Should it? *** AddHandler MyEvent, AddressOf imc.MyMethod
End Sub
End Class </code>
Charles
In article <OP**************@tk2msftngp13.phx.gbl>, bl***@nowhere.com
says... Although the interface is not private, it seems incongruous that I should be able to declare the method as private but still call it
But I can't see any logical reason to define the scope of a class method
that implements an interface method as private. That goes against the
whole concept of an interface.
--
Patrick Steele
Microsoft .NET MVP http://weblogs.asp.net/psteele
Hi Patrick
I'm with you on that one. And until today I had declared them all as public
and was happy. Then I ran FxCop, and it got upset at them being public and
suggested I make them private. So I did, not expecting it to work. Well, the
rest you know.
Is this just a little vagary of the compiler?
Charles
"Patrick Steele [MVP]" <pa*****@mvps.org> wrote in message
news:MP************************@msnews.microsoft.c om... In article <OP**************@tk2msftngp13.phx.gbl>, bl***@nowhere.com says... Although the interface is not private, it seems incongruous that I
should be able to declare the method as private but still call it
But I can't see any logical reason to define the scope of a class method that implements an interface method as private. That goes against the whole concept of an interface.
-- Patrick Steele Microsoft .NET MVP http://weblogs.asp.net/psteele
In article <uu**************@tk2msftngp13.phx.gbl>, bl***@nowhere.com
says... Hi Patrick
I'm with you on that one. And until today I had declared them all as public and was happy. Then I ran FxCop, and it got upset at them being public and suggested I make them private. So I did, not expecting it to work. Well, the rest you know.
My guess is it works because the .NET runtime is the one that will
handle the calling of all of the registered delegates (event handlers)
-- not your actual class. And the runtime has access to everything! :)
--
Patrick Steele
Microsoft .NET MVP http://weblogs.asp.net/psteele
Try not to declare the object as a type of the interface, but a type of the
actual class. That should fix your concern. The compiler will then correctly
recognize that doing this is not possible.
Of course, it doesn't fix the oddity with the runtime. Apparently, it
assumes because MyClass implements IMyClass, it should be allright to call
the private method.
In a way, it may be a fault-tolerance mechanism: because an variable
declared from an interface can call any method in that interface, at
runtime, errors could occur if the implementation was of such a method was
private.
Interesting point though.
Also, in my tests ( http://www.adduxis.com/play/module1.txt), it works even
when not using it as a handler, but simply calling the method!
--
Sven http://www.adduxis.com
"Charles Law" <bl***@nowhere.com> wrote in message
news:u1**************@TK2MSFTNGP10.phx.gbl... Sorry, but I am on a bit of a roll today.
I have just found that I can make a method private to my class, but then
use AddHandler in an external class to hook it up. Is that what people would expect?
For example
<code> Public Interface IMyClass Sub MyMethod(ByVal sender As Object, e As EventArgs) End Interface
Public Class MyClass
Implements IMyClass
' NOTE: this is declared Private Private Sub MyMethod(ByVal sender As Object, e As EventArgs)
Implements IMyClass.MyMethod ' Do stuff End Sub End Class
Public Class MainClass
Public Event MyEvent(ByVal sender As Object, e As EventArgs)
Public Sub SetHandler()
Dim imc as IMyClass
imc = New MyClass
'*** This works. Should it? *** AddHandler MyEvent, AddressOf imc.MyMethod
End Sub
End Class </code>
Charles
Charles:
Also remember that an interface is a contract, the class implementing the
method has specifically agreed to implementing all methods. Apparently, the
sentence for implementing it private is intrusion in the class' privacy (to
put it in legal terms...)
--
Sven http://www.adduxis.com
"SA" <in*********@freemail.nl> wrote in message
news:es****************@TK2MSFTNGP10.phx.gbl... Try not to declare the object as a type of the interface, but a type of
the actual class. That should fix your concern. The compiler will then
correctly recognize that doing this is not possible.
Of course, it doesn't fix the oddity with the runtime. Apparently, it assumes because MyClass implements IMyClass, it should be allright to call the private method.
In a way, it may be a fault-tolerance mechanism: because an variable declared from an interface can call any method in that interface, at runtime, errors could occur if the implementation was of such a method was private.
Interesting point though.
Also, in my tests (http://www.adduxis.com/play/module1.txt), it works even when not using it as a handler, but simply calling the method!
--
Sven http://www.adduxis.com
"Charles Law" <bl***@nowhere.com> wrote in message news:u1**************@TK2MSFTNGP10.phx.gbl... Sorry, but I am on a bit of a roll today.
I have just found that I can make a method private to my class, but then use AddHandler in an external class to hook it up. Is that what people would expect?
For example
<code> Public Interface IMyClass Sub MyMethod(ByVal sender As Object, e As EventArgs) End Interface
Public Class MyClass
Implements IMyClass
' NOTE: this is declared Private Private Sub MyMethod(ByVal sender As Object, e As EventArgs) Implements IMyClass.MyMethod ' Do stuff End Sub End Class
Public Class MainClass
Public Event MyEvent(ByVal sender As Object, e As EventArgs)
Public Sub SetHandler()
Dim imc as IMyClass
imc = New MyClass
'*** This works. Should it? *** AddHandler MyEvent, AddressOf imc.MyMethod
End Sub
End Class </code>
Charles
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