Question

I have a SharePoint WebPart project in visual studio. As part of the project I am referencing the interop.ActiveDS.dll.

I can compile the project successfully and add/deploy the solution to SharePoint. When I try to run the WebPart in SharePoint I get the error:

That assembly does not allow partially trusted callers.  [SecurityException: That assembly does not allow partially trusted callers.]    PeopleAdWebPart.PeopleAdWebPart.OnLoad(EventArgs e) +0    System.Web.UI.Control.LoadRecursive() +47    System.Web.UI.Control.LoadRecursive() +131    System.Web.UI.Control.LoadRecursive() +131    System.Web.UI.Control.LoadRecursive() +131    System.Web.UI.Control.LoadRecursive() +131    System.Web.UI.Control.LoadRecursive() +131    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7350    System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +213    System.Web.UI.Page.ProcessRequest() +86    System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) +18    System.Web.UI.Page.ProcessRequest(HttpContext context) +49    Microsoft.SharePoint.Publishing.TemplateRedirectionPage.ProcessRequest(HttpContext context) +153    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +358    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64 

I have added [assembly: System.Security.AllowPartiallyTrustedCallers] to the assemblyinfo.cs file but this has not helped.

Would appreciate any answers for this!

Answer 1

The problem is that Interop.ActiveDs.dll does not allow partially trusted callers. Your best bet is to deploy a signed interop assembly to the GAC:

TlbImp %windir%\system32\ActiveDs.tlb /out:Interop.ActiveDs.dll /keyfile:KeyFile.snk