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FileHelpers.dll are referenced within 2 class libraryies (Dto and Services) in my solution
My webapp (asp.net mvc) is on IIS7 (Full Trust) Windows 7 PRO 64 and I sometimes get this exception when starting my app from VS2008: (to get rid of it I delete the FileHelpers.dll from bin, run, close browser, rebuild the solution and run again )

     [PolicyException: Required permissions cannot be acquired.]
       System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Boolean checkExecutionPermission) +10238142
       System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Int32& securitySpecialFlags, Boolean checkExecutionPermission) +97

    [FileLoadException: Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
       System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection) +0
       System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +416
       System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) +166
       System.Reflection.Assembly.Load(String assemblyString) +35
       System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +190

    [ConfigurationErrorsException: Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
       System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +11207304
       System.Web.Configuration.CompilationSection.LoadAllAssembliesFromAppDomainBinDirectory() +388
       System.Web.Configuration.CompilationSection.LoadAssembly(AssemblyInfo ai) +232
       System.Web.Configuration.AssemblyInfo.get_AssemblyInternal() +48
       System.Web.Compilation.BuildManager.GetReferencedAssemblies(CompilationSection compConfig) +210
       System.Web.Compilation.BuildProvidersCompiler..ctor(VirtualPath configPath, Boolean supportLocalization, String outputAssemblyName) +76
       System.Web.Compilation.ApplicationBuildProvider.GetGlobalAsaxBuildResult(Boolean isPrecompiledApp) +283
       System.Web.Compilation.BuildManager.CompileGlobalAsax() +50
       System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +676

    [HttpException (0x80004005): Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
       System.Web.Compilation.BuildManager.ReportTopLevelCompilationException() +76
       System.Web.Compilation.BuildManager.EnsureTopLevelFilesCompiled() +1012
       System.Web.Hosting.HostingEnvironment.Initialize(ApplicationManager appManager, IApplicationHost appHost, IConfigMapPathFactory configMapPathFactory, HostingEnvironmentParameters hostingParameters) +1025

[HttpException (0x80004005): Could not load file or assembly 'FileHelpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=3e0c08d59cc3d657' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11301302
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +88
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4338644
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Could it be the running order of the dependencies? Another option for your dev machine is to drop the dll into the GAC instead of having it local. That ensures that it runs as full trust.

My best guess for the trust error since you're running in full trust is that something in one of the dlls or in code is dropped down to partial trust at some point.

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  • how do you drop the dll in the GAC ?, they are in my bin folder
    – Omu
    Commented Dec 12, 2009 at 18:41
  • The dll has to be signed for it to work in the GAC but most 3rd party DLLs are. Just drag and drop into c:\windows\assembly. You'll need to reference it in your project too (VS can do it with add references)
    – Scott Forsyth
    Commented Dec 13, 2009 at 1:12

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