MEF - 错误的汇编版本

我有一个使用MEF，Webapi和OData的Web应用程序。对于MEF，我创建了一个辅助类，可根据需要加载目录（初次访问时）MEF - 错误的汇编版本

以下是MEF集成代码。

Public Shared ReadOnly Property Catalog As AggregateCatalog 
    Get 
     If _catalog Is Nothing Then 

      Dim catFolder = "." 
      Dim path = AppDomain.CurrentDomain.BaseDirectory.ToLower 
      _catalog = new AggregateCatalog() 
      Dim di = New DirectoryInfo(path) 
      Dim dlls = di.GetFileSystemInfos("MyApp.*.dll") 
      _catalog = New AggregateCatalog() 

      For Each dll In dlls 
       Try 
        Dim ac = New AssemblyCatalog(Assembly.LoadFile(dll.FullName)) 
        Dim parts = ac.Parts.ToArray() 'throws ReflectionTypeLoadException 
        _catalog.Catalogs.Add(ac) 

       Catch ex As ReflectionTypeLoadException 
        Log.Instance.Error("Error when Trying to load {0}", dll.FullName) 
        Log.Instance.Error(ex) 
        For Each iex In ex.LoaderExceptions 
         Log.Instance.Error(iex) 
        Next 
       End Try 
      Next 
     End If 
     Return _catalog 
    End Get 
End Property

我的一个项目（实际的Web应用程序项目）的使用下面的NuGet包（其中包括）：的WebAPI 5.2.3 WebApi.OData 5.7.0

我的问题是，当MEF类尝试加载该程序集（使用OData和WebApi的程序集，它会抛出运行时错误，该程序集记录如下）仅在部署中，在生产计算机上发生此问题。看到下面的错误，似乎即使项目引用了Sy stem.Web.Http版本5.2.3.0，在运行时System.Web.Http.Odata组件试图加载System.Web.Http版本5.2.2.0（！？！？！？）

在我的项目，该参考值设置为正确的DLL（版本5.2.3.0），该dll被设定为复制本地=真，并在web.config中我有

<dependentAssembly> 
    <assemblyIdentity name="System.Web.Http" publicKeyToken="31bf3856ad364e35" culture="neutral" /> 
    <bindingRedirect oldVersion="0.0.0.0-5.2.3.0" newVersion="5.2.3.0" /> 
    </dependentAssembly>

我没有需要任何类由MEF在这个项目（程序集）中组成，所以我可以简单地将它从MEF加载中排除，但是这个错误令我困惑，我想找到一个解决方案，以防在其他程序集中遇到类似问题。

以下是错误我得到

2015-11-04 07:17:02.7758|ERROR|MyPermitNow.Log|Error when Trying to load m:\web\www.mypermitnow.org\web_1\bg-processor\MyPermitNow.Jurisdiction.dll 
2015-11-04 07:17:02.7758|ERROR|MyPermitNow.Log|System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. 
    at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) 
    at System.Reflection.RuntimeModule.GetTypes() 
    at System.Reflection.Assembly.GetTypes() 
    at System.ComponentModel.Composition.Hosting.AssemblyCatalog.get_InnerCatalog() 
    at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetEnumerator() 
    at System.Linq.EnumerableQuery`1.GetEnumerator() 
    at System.Linq.EnumerableQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() 
    at System.Linq.Buffer`1..ctor(IEnumerable`1 source) 
    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) 
    at MyPermitNow.MEFHelper.get_Catalog() 
System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. 
    at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module) 
    at System.Reflection.RuntimeModule.GetTypes() 
    at System.Reflection.Assembly.GetTypes() 
    at System.ComponentModel.Composition.Hosting.AssemblyCatalog.get_InnerCatalog() 
    at System.ComponentModel.Composition.Hosting.AssemblyCatalog.GetEnumerator() 
    at System.Linq.EnumerableQuery`1.GetEnumerator() 
    at System.Linq.EnumerableQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() 
    at System.Linq.Buffer`1..ctor(IEnumerable`1 source) 
    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source) 
    at MyPermitNow.MEFHelper.get_Catalog() 
2015-11-04 07:17:02.7758|ERROR|MyPermitNow.Log|System.IO.FileLoadException: Could not load file or assembly 'System.Web.Http, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) 
File name: 'System.Web.Http, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' 

=== Pre-bind state information === 
LOG: DisplayName = System.Web.Http, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 
(Fully-specified) 
LOG: Appbase = file:///M:/web/www.mypermitnow.org/web_1/bg-processor/ 
LOG: Initial PrivatePath = NULL 
Calling assembly : System.Web.Http.OData, Version=5.7.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35. 
=== 
LOG: This bind starts in default load context. 
LOG: No application configuration file found. 
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.config. 
LOG: Post-policy reference: System.Web.Http, Version=5.2.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35 
LOG: Attempting download of new URL file:///M:/web/www.mypermitnow.org/web_1/bg-processor/System.Web.Http.DLL. 
WRN: Comparing the assembly name resulted in the mismatch: Build Number 
ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.

来源

2015-11-04 bzamfir

可能有很多事情可能会导致此。有些事情要检查：

在服务器上有DLL的旧版本有问题吗？当CSPROJ不使用时，它现在可能具有Private = true，那么该库就包含在主应用程序/站点项目中。所以新的不会被复制，但旧的坐在那里，但在一个更直接的位置，所以它首先加载。
任何应用程序/ web.config转换可能会取代程序集绑定XML吗？
如果它不在直接应用程序文件夹中，那么GAC中包含什么？
打开Fusion程序集加载日志记录

来源

2016-02-04 16:05:13

MEF - 错误的汇编版本

回答

相关问题