How do I reference assemblies outside the bin folder in an ASP.net application?

Question

I've a working XML Web service written in ASP.Net. Now I need to reference certain assemblies lying in a specific folder e.g. c:\NotMyCode
I do not want to copy/duplicate zillions of dlls in that folder into my bin folder.

I tried to keep the CopyLocal=false for the assemblies referred in the Web Service. That ended up in a FileNotFound exception for the assembly. When I switch to CopyLocal=true, the referenced DLLs are copied over to the bin folder.. and it works.

So my question here is: How do I reference assemblies that do not lie in my bin folder or a subfolder beneath it ? Do I need to change some security policy files somewhere? I think I'm not the first person to ever want to do something like this.. so I'm assuming someone has already solved this problem.

(I've tried impersonating an admin user in the IIS ASP.net configuration panel, but that didnt work either.)

Thanks for reading...

Update: Can't install it in the GAC either. To give an analogy, this web service is giving a simplified view to a third party app e.g. Starteam. I can't (shouldn't have to.. don't want to..) copy all the binaries in that folder to the bin folder or install it into the GAC

Answer 1

You could always put your referenced assemblies in the GAC, then the location would not matter. You can install the component by dragging it into the GAC (C:\windows\assembly) or running GACUtil.exe.

This article may help. It describes the "Best Practices for Assembly Loading."

At first I thought you could used the <probing privatePath="bin\debug"/> element in the runtime/assemblyBinding in the web.config, but the probing will only allow you to specify subdirectories under the root location.

Answer 2

<runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <probing publicPath="C:\MyFolder" />
      <dependentAssembly>
       <assemblyIdentity name="MyAssembly" />
      </dependentAssembly>
     </assemblyBinding>
</runtime>

Now the runtime knows where to look if it doesn't find your referenced assembly in the bin directory, GAC, etc.

Answer 3

You can put in GAC and access it from there.

Answer 4

I think you can reference specific assembly paths in code as well.

AppDomain.CurrentDomain.AppendPrivatePath("C:\\NotMyCode");

Doing that in your Global.asax Application_Start should do the trick.