我有一个使用MEF,Webapi和OData的网络应用程序。 对于MEF,我创建了一个帮助程序类,按需加载目录(首次访问时)
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)使用以下nuget包(以及其他): WebApi 5.2.3 WebApi.OData 5.7.0
我的问题是,当MEF类尝试加载此程序集(使用OData和WebApi的程序集时,它会抛出运行时错误,记录如下)。 仅在部署中,在生产计算机上发生此问题。在开发过程中一切正常。
正如您在下面的错误中看到的那样,即使项目引用System.Web.Http版本5.2.3.0,在运行时System.Web.Http.Odata程序集也试图加载System.Web.Http版本 5.2.2.0 (!?!?!?)
在我的项目中,引用设置为更正dll(版本5.2.3.0),dll设置为复制本地=真,而在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>
我不需要在这个项目(程序集)中由MEF组成任何类,所以我可以简单地将它排除在MEF的加载之外,但这个错误令我感到困惑,我想找到解决方案,以防我遇到其他程序集中的类似问题。
这是我得到的错误
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.
答案 0 :(得分:0)
可能会有很多事情可能导致这种情况发生。有些事要检查: