如何在 Rackspace 云站点上以中等信任度运行 System.Web.DataVisualization

Question

我在获取 Microsoft 图表时遇到问题：

System.Web.DataVisualization.dll

工作

在 IIS 7 上的 Windows Server 2008 上的中等信任环境中使用 .Net 3.5

在其云站点的 Rackspace 环境中

。我从 Rackspace 托管环境中收到此错误消息：

 Security Exception

 Description: The application attempted to perform an operation not allowed by the security policy.  To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file. 

 Exception Details: System.Security.SecurityException: That assembly does not allow partially trusted callers.

我已在本地暂存环境中设置了一个站点来测试中等信任，并且收到此消息：

 Required permissions cannot be acquired.

 Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.Security.Policy.PolicyException: Required permissions cannot be acquired.

 Source Error: 

 An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

 Stack Trace: 

 [PolicyException: Required permissions cannot be acquired.]
   System.Security.SecurityManager.ResolvePolicy(Evidence evidence, PermissionSet reqdPset, PermissionSet optPset, PermissionSet denyPset, PermissionSet& denied, Boolean checkExecutionPermission) +10239406
   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 'System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' 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 'System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
 System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective) +11204104
 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 'System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' 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 'System.Web.DataVisualization, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. Failed to grant minimum permission requests. (Exception from HRESULT: 0x80131417)]
 System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +11297830
 System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +88
 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +4336948

 Version Information: Microsoft .NET Framework Version:2.0.50727.4200; ASP.NET Version:2.0.50727.4016

Rackspace 将不会安装 MSChart.exe 软件包Rackspace 云站点服务器。

Answer 1

必须使用 MSI 安装 MS Charting for .Net 3.5。

要使其在无法安装的中等信任度下工作，请尝试使用 .Net 4.0（它是 .Net Framework 的一部分）。