MEF - 錯誤的彙編版本

我有一個使用MEF，Webapi和OData的Web應用程序。對於MEF，我創建了一個輔助類，可根據需要加載目錄（初次訪問時）MEF - 錯誤的彙編版本

以下是MEF集成代碼。

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

我的一個項目（實際的Web應用程序項目）的使用下面的NuGet包（其中包括）：的WebAPI 5.2.3 WebApi.OData 5.7.0

我的問題是，當MEF類嘗試加載該程序集（使用OData和WebApi的程序集，它會拋出運行時錯誤，該程序集記錄如下）僅在部署中，在生產計算機上發生此問題。看到下面的錯誤，似乎即使項目引用了Sy stem.Web.Http版本5.2.3.0，在運行時System.Web.Http.Odata組件試圖加載System.Web.Http版本5.2.2.0（！？！？！？）

在我的項目，該參考值設置爲正確的DLL（版本5.2.3.0），該dll被設定爲複製本地=真，並在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>

我沒有需要任何類由MEF在這個項目（程序集）中組成，所以我可以簡單地將它從MEF加載中排除，但是這個錯誤令我困惑，我想找到一個解決方案，以防在其他程序集中遇到類似問題。

以下是錯誤我得到

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.

來源

2015-11-04 bzamfir

可能有很多事情可能會導致此。有些事情要檢查：

在服務器上有DLL的舊版本有問題嗎？當CSPROJ不使用時，它現在可能具有Private = true，那麼該庫就包含在主應用程序/站點項目中。所以新的不會被複制，但舊的坐在那裏，但在一個更直接的位置，所以它首先加載。
任何應用程序/ web.config轉換可能會取代程序集綁定XML嗎？
如果它不在直接應用程序文件夾中，那麼GAC中包含什麼？
打開Fusion程序集加載日誌記錄

來源

2016-02-04 16:05:13

MEF - 錯誤的彙編版本

回答

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