SPWebCollection.Add gives exception “That assembly does not allow partially trusted callers.”

Question

I created an assembly for SharePoint 2010, which is deployed into the GAC. It contains SPWebCollection.Add method. When the "STS#1" is used as template, there is no exception, the site is created successfully.

newSite = subSites.Add(siteUrl, siteTitle, siteDescription, 1033, "STS#1", true, false);

However when I use a custom site template, there is an error: "That assembly does not allow partially trusted callers."

newSite = subSites.Add(siteUrl, siteTitle, siteDescription, 1033, WorkspaceTemplate, true, false);

As this is a shared/hosted environment, it's not allowed to change the trustlevel.

Any help is much appreciated.

Regards, Andre

Answer 1

Is your code dll signed? and can you also check if your AssemblyInfo.cs has

[assembly: AllowPartiallyTrustedCallers()] 

If above doesn't help then try to change the trust level from “Minimal trust” to “Medium trust” or other higher level. More info: http://www.ben-morris.com/allow-partially-trusted-callers-asp-net-shared-hosting-environments

Answer 2

You can set your web application to run in a medium trust environment, by adding the following line to your web.config file:

<trust level=”Medium”/>

Try this and it should work.