Re: Multiple versions of the same type coexisting in the same AppD

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Hi Nicholas,

Thanks to you and all those who replied.
The extern alias solution matches my requirement very, very closely, that
sounds excellent news!

However, how would I be able to specify aliasing when loading the two
different DLL's in the AppDomain?

Thanks,
V.

"Nicholas Paldino [.NET/C# MVP]" wrote:

Vanni,

You can do this, but you have to know at compile time what the two
separate versions are. You would use the "extern alias" keywords, along
with a special way of referencing the dlls which contain the types when
calling the compiler (there is support in VS.NET for this too).

Take a look at the documentation for "extern alias" located at:

http://msdn2.microsoft.com/en-us/library/ms173212(VS.80).aspx

Anson Horton also has a walkthrough which will help:

http://blogs.msdn.com/ansonh/archive/2006/09/27/774692.aspx


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx

"Vanni" <Vanni@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:C2C183FB-849A-4095-8BEE-73BAE93BCAD6@xxxxxxxxxxxxxxxx
Hello,

I have the requirement of being able to load different versions of the
same
type (same class name) in the executing AppDomain. I am aware that I would
not be able to unload obsolete instances, but I don't mind. The problem is
that, it seems, only one instance of the same class type can be present in
one particular AppDomain, and whatever attempt to load a class with the
same
name will result in the old instance being passed.

I would assume that a possible solution would be to have class names get
different names (eg. SampleClassName_{some Guid}) before being loaded, but
can I really do this hacking into a compiled DLL?

I have Googled around but couldn't find anything related to this. Any
ideas?

Thanks in advance, regards,
Vanni




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