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我有一个项目是在安装了 MVC3 的机器上开发的。我将项目复制到同时安装了 3 MVC 和 MVC4 的机器上。出于某种原因，我收到以下错误。MVC3 和 MVC4 应该能够并排运行。我认为该错误与安装 MVC4 有关，因为成员资格提供程序在 3 和 4 之间更改。我不确定如何隔离问题。在安装了 MVC3 和 MVC4 的开发机器上运行 MVC3 项目时，如何解决 ConfigurationErrorsException？

System.Configuration.ConfigurationErrorsException was unhandled by user code
  Message=Exception has been thrown by the target of an invocation. (C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.Web\web.config line 42)
  Source=System.Web
  BareMessage=Exception has been thrown by the target of an invocation.
  Filename=C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.Web\web.config
  Line=42
  StackTrace:
       at System.Web.Security.Membership.Initialize()
       at System.Web.Security.Membership.get_Provider()
  InnerException: System.Reflection.TargetInvocationException
       Message=Exception has been thrown by the target of an invocation.
       Source=mscorlib
       StackTrace:
            at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
            at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)
            at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)
            at System.Activator.CreateInstance(Type type, Boolean nonPublic)
            at System.Web.HttpRuntime.CreatePublicInstance(Type type)
            at System.Web.Configuration.ProvidersHelper.InstantiateProvider(ProviderSettings providerSettings, Type providerType)
       InnerException: System.NullReferenceException
            Message=Object reference not set to an instance of an object.
            Source=Acme.Widget.DAL
            StackTrace:
                 at Acme.Widget.DAL.Utilities.GetRegistryValue(String registryKeyPath, String valueName) in C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.DAL\Utilities.cs:line 67
                 at Acme.Widget.DAL.Utilities.GetConnectionString() in C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.DAL\Utilities.cs:line 15
                 at Acme.Widget.DAL.StoredProcedureRepository..ctor() in C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.DAL\StoredProcedureRepository.cs:line 21
                 at Acme.Widget.Provider.Membership..ctor() in C:\Projects\Acme\BOM&MRP\AcmeWidget\Acme.Widget.Provider\Membership.cs:line 18
            InnerException:

提前致谢。

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1 回答 1

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事实证明，问题是由连接字符串的构建方式引起的。配置错误对诊断问题没有帮助，但 Ankush Jain 的上述评论导致寻找正确的位置。连接字符串存储在注册表中。新机是64位，老机是32位。更新代码检查环境后，代码运行正常。

于 2013-07-18T17:05:20.683 回答