I'm not sure this will be of much help but are you using the
AspCompat
attribute on the ASP.NET Page?
--
Patrick Steele
http://weblogs.asp.net
/psteele
-----Original Message-----
From: Discussion of advanced .NET topics.
[mailto:ADVANCED-DOTNET DISCUSS.DEVELOP.COM] On Behalf Of Ryan
Parlee
Sent: Friday, October 20, 2006 6:58 AM
To: ADVANCED-DOTNETDISCUSS.DEVELOP.COM
Subject: [ADVANCED-DOTNET] ASP.NET calling into VB COM loses
applicatoin-user context
Hello,
I have an ASP.NET application that needs to call into a VB6
component
(for which I cannot modify). This VB6 component reads a
ProgId from a
configuration setting and instantiates and calls my .NET CCW
object. The
problem is that when the call from the VB6 COM object to the
.NET
component is made, the .NET component can no longer access
the original
HttpContext.Current.
In order for the HttpContext.Current to work correctly, the
returned
method call from VB6 COM trough the CCW needs to be 1) on
the same
original thread and 2) has to be in the same AppDomain (?Is
that right?)
At first, I didn't think about the thread issue and just
noticed that
ASP.NET creates a different AppDomain for each application
so my
original ASP.NET application is running in a named
AppDomain, something
like /LM/W3SVC/1/Root-asdfasdfasdf. COM Interop, on the
other hand,
apparently always uses the DefaultAppDomain so when the call
from VB6
COM is marshaled into the CLR that's where it gets created.
Using Remoting I successfully got my object to be created in
the same
original AppDomain, but of course that did not work because
Remoted
objects always incur a thread switch (?Is that right?)
I then realized that there were actually two three thread
switches going
on: one between the original .NET object and the VB6 COM
object, another
when the VB6 COM object calls back into .NET, and the last
one between
the call from the Remoted Client to the Remoted Server
component.
So my question is this: Is it possible to call from .NET to
VB6 and then
back to .NET on a single thread and within the same
AppDomain?
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