Assembly loaded from URL needs to read registry - but can't

From: gkelly (gkelly_at_xmission.com)
Date: 02/25/05 

Date: Thu, 24 Feb 2005 17:49:52 -0700

I have a set of applications that use a common assembly library.

AppA, AppB and AppC all use LibA and LibB

These will run on about 25 computers.

AppA and LibA need to read registry to determine database connect string to
use and other misc config stuff

For a while anyway, all code will be updated periodically. So, I decided
place code on our web server.

Instead of AppA and AppB being "Windows Applications" I changed them to
Class Libraries.

I created a Launcher App that will use Assembly.LoadFrom to load from a url
like http://server/applib/AppA.dll

However, since code loaded this way runs in a different context I get an
error error such as:

Request for the permission of type
System.Security.Permissions.RegistryPermission failed..

I have read about this and somewhat understand the issues involved.

Question: Is there a "simple" way to load a dll from a URL and have it run
with the same permission as code that was
loaded locally?

I thought the following would work, but it doesnt. Same error happens. So,
obviously my understanding is very limited.

Evidence ev = new Evidence();
ev.Merge( AppDomain.CurrentDomain.Evidence );
ev.AddHost( new Zone( SecurityZone.MyComputer ));
Assembly v_assembly = Assembly.LoadFrom( "http://server/applib/AppA.dll",
ev );

when creating an object instance from this assembly it still can't read the
registry. I "thought" this would load the assembly so that's
it's code would run with same permissions as the launcher. It doesn't.

Any help would be appreciated.

gkelly

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