I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
What constructs in C# provide the same functionality as #include C++?
For example:
Declared interface
interface MyAbstractInter face
A. Assembly 1
class DerivedClassOne : MyAbstractInter face
B. Assembly 2
class DerivedClassTwo : MyAbstractInter face
C. Application Executable, dynamically loading assemblies from above
MyAbstractInter face someVariable = null;
Assembly assemblyOne = System.AppDomai n.CurrentDomain .Load(...);
MyAbstractInter face classOne =
(MyAbstractInte rface)assembly. CreateInstance( "DerivedClassOn e");
// Use classOne
classOne.SomeMe thod();
I've discovered that .NET is so strongly typed that defining the same
interface in each assembly causes an exception when I cast the object from
CreateInstance.
TIA,
SteveB, MCSD
Welch Allyn
7  1268 
You would have to put it into a shared library (or have the plugins
reference the original library) ...
LibraryA.ISomet hing != LibraryB.ISomet hing
Cheers,
Greg Young
MVP - C# http://codebetter.com/blogs/gregyoung
"Steve_B" <St****@discuss ions.microsoft. comwrote in message
news:7F******** *************** ***********@mic rosoft.com...
>I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in
C#?
What constructs in C# provide the same functionality as #include C++?
For example:
Declared interface
interface MyAbstractInter face
A. Assembly 1
class DerivedClassOne : MyAbstractInter face
B. Assembly 2
class DerivedClassTwo : MyAbstractInter face
C. Application Executable, dynamically loading assemblies from above
MyAbstractInter face someVariable = null;
Assembly assemblyOne = System.AppDomai n.CurrentDomain .Load(...);
MyAbstractInter face classOne =
(MyAbstractInte rface)assembly. CreateInstance( "DerivedClassOn e");
// Use classOne
classOne.SomeMe thod();
I've discovered that .NET is so strongly typed that defining the same
interface in each assembly causes an exception when I cast the object from
CreateInstance.
TIA,
SteveB, MCSD
Welch Allyn
Steve_B wrote:
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
You can put the interface in your .exe file, and have your .dlls
reference the executable.
What constructs in C# provide the same functionality as #include C++?
C#, as you've found, is strongly typed, so there isn't an equivalent
with the same semantics.
-- Barry
-- http://barrkel.blogspot.com/
Barry Kelly wrote:
Steve_B wrote:
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
You can put the interface in your .exe file, and have your .dlls
reference the executable.
Yuck.. that's a horrible idea. A dll shouldn't ever reference an exe..
another dll is the best option.
Steve_B wrote:
I've discovered that .NET is so strongly typed that defining the same
interface in each assembly causes an exception when I cast the object from
CreateInstance.
Of course it is. How could it be any other way? If it weren't this way,
the runtime could well confuse the ISomethingOrOth er interface that you
wrote with the ISomethingOrOth er interface buried somewhere inside some
Framework DLL. Or, more importantly, the runtime could well confuse the
ISomethingOrOth er interface written by some hacker with the one that
you wrote.
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
What constructs in C# provide the same functionality as #include C++?
For example:
Declared interface
interface MyAbstractInter face
A. Assembly 1
class DerivedClassOne : MyAbstractInter face
B. Assembly 2
class DerivedClassTwo : MyAbstractInter face
C. Application Executable, dynamically loading assemblies from above
MyAbstractInter face someVariable = null;
Assembly assemblyOne = System.AppDomai n.CurrentDomain .Load(...);
MyAbstractInter face classOne =
(MyAbstractInte rface)assembly. CreateInstance( "DerivedClassOn e");
// Use classOne
classOne.SomeMe thod();
The solution is to put the interface definition itself into a separate
DLL. See Jon Skeet's article here: http://www.yoda.arachsys.com/csharp/plugin.html
Yes, I agree that is not a very elegant solution (DLLs referencing the EXE)
but the only one I can think of besides creating a separate (shared) library.
Maybe Anders will pipe in with some insight...
"Andy" wrote:
Barry Kelly wrote:
Steve_B wrote:
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
You can put the interface in your .exe file, and have your .dlls
reference the executable.
Yuck.. that's a horrible idea. A dll shouldn't ever reference an exe..
another dll is the best option.
Steve there are benefits to keeping it seperate as opposed to the way an
include file works .. namely versioning.
Cheers,
Greg
"Steve_B" <St****@discuss ions.microsoft. comwrote in message
news:ED******** *************** ***********@mic rosoft.com...
Yes, I agree that is not a very elegant solution (DLLs referencing the
EXE)
but the only one I can think of besides creating a separate (shared)
library.
Maybe Anders will pipe in with some insight...
"Andy" wrote:
>Barry Kelly wrote:
Steve_B wrote:
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an
interface
without creating and deploying a seperate assembly. How is this done
in C#?
You can put the interface in your .exe file, and have your .dlls
reference the executable.
Yuck.. that's a horrible idea. A dll shouldn't ever reference an exe..
another dll is the best option.
Having a background in C++ and COM, reusing an interface is not that
uncommon. But, in the current world of more secure applications I can see
where that's no longer acceptable...
"Bruce Wood" wrote:
>
Steve_B wrote:
I've discovered that .NET is so strongly typed that defining the same
interface in each assembly causes an exception when I cast the object from
CreateInstance.
Of course it is. How could it be any other way? If it weren't this way,
the runtime could well confuse the ISomethingOrOth er interface that you
wrote with the ISomethingOrOth er interface buried somewhere inside some
Framework DLL. Or, more importantly, the runtime could well confuse the
ISomethingOrOth er interface written by some hacker with the one that
you wrote.
I would like to dynamically load assemblies that implement a single
interface. I would like to reference a single definition of an interface
without creating and deploying a seperate assembly. How is this done in C#?
What constructs in C# provide the same functionality as #include C++?
For example:
Declared interface
interface MyAbstractInter face
A. Assembly 1
class DerivedClassOne : MyAbstractInter face
B. Assembly 2
class DerivedClassTwo : MyAbstractInter face
C. Application Executable, dynamically loading assemblies from above
MyAbstractInter face someVariable = null;
Assembly assemblyOne = System.AppDomai n.CurrentDomain .Load(...);
MyAbstractInter face classOne =
(MyAbstractInte rface)assembly. CreateInstance( "DerivedClassOn e");
// Use classOne
classOne.SomeMe thod();
The solution is to put the interface definition itself into a separate
DLL. See Jon Skeet's article here:
http://www.yoda.arachsys.com/csharp/plugin.html
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