Question

Is there any way to get Glimpse to work in Medium Trust?

If I set <glimpse enabled="true"/> in my web.config, I get a Security Exception:

   [SecurityException: Request failed.]
   System.Security.CodeAccessSecurityEngine.Check(Object demand, StackCrawlMark& stackMark, Boolean isPermSet) +0
   System.Security.CodeAccessSecurityEngine.Check(PermissionSet permSet, StackCrawlMark& stackMark) +31
   System.Security.PermissionSet.Demand() +68
   System.Security.CodeAccessSecurityEngine.CheckGrantSetHelper(PermissionSet grantSet) +57
   System.Reflection.Emit.AssemblyBuilder.nCreateDynamicAssembly(AppDomain domain, AssemblyName name, Evidence identity, StackCrawlMark& stackMark, PermissionSet requiredPermissions, PermissionSet optionalPermissions, PermissionSet refusedPermissions, Byte[] securityRulesBlob, Byte[] aptcaBlob, AssemblyBuilderAccess access, DynamicAssemblyFlags flags, SecurityContextSource securityContextSource) +0
   System.Reflection.Emit.AssemblyBuilder..ctor(AppDomain domain, AssemblyName name, AssemblyBuilderAccess access, String dir, Evidence evidence, PermissionSet requiredPermissions, PermissionSet optionalPermissions, PermissionSet refusedPermissions, StackCrawlMark& stackMark, IEnumerable`1 unsafeAssemblyAttributes, SecurityContextSource securityContextSource) +198
   System.Reflection.Emit.AssemblyBuilder.InternalDefineDynamicAssembly(AssemblyName name, AssemblyBuilderAccess access, String dir, Evidence evidence, PermissionSet requiredPermissions, PermissionSet optionalPermissions, PermissionSet refusedPermissions, StackCrawlMark& stackMark, IEnumerable`1 unsafeAssemblyAttributes, SecurityContextSource securityContextSource) +125
   System.AppDomain.InternalDefineDynamicAssembly(AssemblyName name, AssemblyBuilderAccess access, String dir, Evidence evidence, PermissionSet requiredPermissions, PermissionSet optionalPermissions, PermissionSet refusedPermissions, StackCrawlMark& stackMark, IEnumerable`1 assemblyAttributes, SecurityContextSource securityContextSource) +43
   System.AppDomain.DefineDynamicAssembly(AssemblyName name, AssemblyBuilderAccess access) +42
   System.ComponentModel.Composition.MetadataViewGenerator..cctor() +257

From what I can tell, the error is similar to the one described here. Basically, MEF isn’t able to do its trick of populating a meta-data instance implementing a particular interface when the app is running in Medium Trust.

Answer 1

Unfortunately currently Glimpse requires Full Trust, you could file an enhancement request with them, most features should be available in Medium Trust as well.