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copied!<p>OK, I've managed to solve this. For people who need to know:</p> <ol> <li>Create an assembly with the Host API in it and allow the add-in to reference it.</li> <li>Ensure the assembly that contains the Host API has the [AllowPartiallyTrustedCallers] attribute on at the assembly level and strong name the assembly.</li> <li>Ensure the Host API assembly is registered with the AppDomain as a full trust assembly (see <a href="http://blogs.msdn.com/b/shawnfa/archive/2005/08/08/449050.aspx" rel="nofollow">http://blogs.msdn.com/b/shawnfa/archive/2005/08/08/449050.aspx</a> on how to do this).</li> <li>Ensure the methods on the Host API that require escalated permissions are decorated with the <strong>[SecuritySafeCritical]</strong> attribute (.NET 4).</li> <li><p>Demand full trust at the start of each method you need escalated permissions and then remove the demand straight after. The code below provides a method that takes a delegate which will be run in full trust.</p> <pre><code>/// <summary> /// Runs the supplied delegate using full trust /// </summary> /// <typeparam name="T"></typeparam> /// <param name="func"></param> /// <returns></returns> private static T RunWithFullTrust<T>(Func<T> func) { //NOTE: This line grants the method full trust new PermissionSet(PermissionState.Unrestricted).Assert(); <pre><code>T result = func(); //Undo the grant for full-trust! CodeAccessPermission.RevertAssert(); return result; </code></pre> } </code></pre></li> </ol> <p>Also, prior to loading any add-ins ensure that the Host API is loaded into the restricted AppDomain. This'll avoid exceptions where the Host API assembly cannot be found.</p>

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