1. What is full trust proxy in the context of SharePoint 2010 Sandboxed Solution?

   A full trust proxy is a mechanism that allows Sandboxed Solution to make a call to trusted assembly outside the Sandbox environment. The trusted assembly can be designed to make external calls (to database or web services), which Sandbox solutions cannot reach. This needed, because not all the SharePoint 2010 solutions might want to live as Sandboxed (with restrictions). In most of the cases, the assemblies inside SharePoint solutions might want to make external calls (to a database or to a web service).

    

2. How to create a full trust proxy operation in Sandboxed Solution?

   Here are the steps required to create full trust proxy operation using Visual Studio:-    

   1. Create a farm solution , create a c# class that is derived from SPProxyOperation and override Execute method
   2. Create another c# class (in the same solution), that is derived from SPProxyOperationArgs. Pass an instance of this class to the Execute method of SPProxyOperation class.
   3. Create a Feature Receiver to register operation with SharePoint Foundation User Code Service
   4. In the Sandboxed Solution project, create a class that calls the proxy operation
   5. Deploy the Sandboxed solution

       

3. In which process does the full trust proxy runs?

   The full trust proxy does not run in w3wp.exe, rather it runs in SPUCWorkerProcessProxy.exe.

    

4. How to programmatically activate the full trust proxy with user code service?

   The following is the code snippet for activating full trust proxy.

    

        SPProxyOperationType proxyOperationType = new SPProxyOperationType(type.Assembly.FullName, type.FullName);

   SPUserCodeService userCodeService = SPUserCodeService.Local;

   userCodeService.ProxyOperationTypes.Add(proxyOperationType);

   userCodeService.Update();

    

5. How to programmatically de-activate the full trust proxy with user code service?

   The following is the code snippet for de-activating full trust proxy.

     SPProxyOperationType proxyOperationType = new SPProxyOperationType(type.Assembly.FullName, type.FullName);

     SPUserCodeService userCodeService = SPUserCodeService.Local;

     userCodeService.ProxyOperationTypes.Remove(proxyOperationType);

     userCodeService.Update();

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