c# - 使用 PostSharp Toolkit 构建在 4.5.1 上失败但适用于 4.5

Question

我保留了 PostSharp.Toolkit.Threading 的 NuGet 包，版本 2.1.1.12，因为我无法升级到版本 3.x。只要我留在 .Net 4 或 4.5 上，任何项目都可以正常编译，但是一旦我更改为 4.5.1 或 4.5.2，我就会收到此错误:

Error   3   error: Unhandled exception (2.1.7.35, 32 bit, CLR 2.0, Release): Cannot load assembly T:\WindowsFormsApplication4\packages\PostSharp.Toolkit.Threading.2.1.1.12\tools\PostSharp.Toolkit.Threading.Weaver.dll.
============ PostSharp Assembly Loading Log ===================
LOG:    NativeDotNetPlatform.LoadAssemblyFromFile: T:\WindowsFormsApplication4\packages\PostSharp.Toolkit.Threading.2.1.1.12\tools\PostSharp.Toolkit.Threading.Weaver.dll.
LOG:    Assembly identity returned by the host: postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil.
LOG:    Assembly 'postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil' is not yet loaded in the AppDomain.
LOG:    Invoking Assembly.Load({postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil})
LOG:    (ClrHost) ProvideAssembly: "postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil".
LOG:    Finding the assembly with binding identity 'postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil'.
LOG:    Location found from cache: 'T:\WindowsFormsApplication4\packages\PostSharp.Toolkit.Threading.2.1.1.12\tools\PostSharp.Toolkit.Threading.Weaver.dll'.
LOG:    (ClrHost) ProvideAssembly: "postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil": assembly found in search path.
LOG:    (ClrHost) ProvideAssembly: "postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil": located in "T:\WindowsFormsApplication4\packages\PostSharp.Toolkit.Threading.2.1.1.12\tools\PostSharp.Toolkit.Threading.Weaver.dll".
LOG:    (ClrHost) ProvideAssembly: "postsharp.toolkit.threading.weaver, version=0.0.0.0, culture=neutral, publickeytoken=null, processorarchitecture=msil": returned successfully.
LOG:    AssemblyLoadException: Could not load file or assembly 'postsharp.toolkit.threading.weaver, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.
LOG:    Loaded: 'mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' from 'C:\Windows\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll'.
LOG:    Loaded: 'PostSharp.Hosting, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.Hosting.dll'.
LOG:    Loaded: 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' from 'C:\Windows\assembly\GAC_MSIL\System.Core\3.5.0.0__b77a5c561934e089\System.Core.dll'.
LOG:    Loaded: 'System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' from 'C:\Windows\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll'.
LOG:    Loaded: 'PostSharp.Sdk, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.Sdk.dll'.
LOG:    Loaded: 'PostSharp.Settings, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.Settings.dll'.
LOG:    Loaded: 'PostSharp, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.dll'.
LOG:    Loaded: 'System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' from 'C:\Windows\assembly\GAC_MSIL\System.Xml\2.0.0.0__b77a5c561934e089\System.Xml.dll'.
LOG:    Loaded: 'System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' from 'C:\Windows\assembly\GAC_MSIL\System.Configuration\2.0.0.0__b03f5f7f11d50a3a\System.Configuration.dll'.
LOG:    Loaded: 'PostSharp.Pipe, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.Pipe.dll'.
LOG:    Loaded: 'PostSharp.Sdk.XmlSerializers, Version=2.1.0.0, Culture=neutral, PublicKeyToken=b13fd38b8f9c99d7' from 'T:\WindowsFormsApplication4\packages\PostSharp.2.1.7.35\tools\Release\PostSharp.Sdk.XmlSerializers.dll'.
=============================================================== See below for details.  T:\WindowsFormsApplication4\WindowsFormsApplication4\POSTSHARP  WindowsFormsApplication4

我不明白为什么会这样。那里有 P# 专家吗？

Answer 1

日志显示 PostSharp 托管 CLR 版本为 2.0。在加载线程编织程序程序集时，CLR 还尝试加载一些需要 CLR 4.0 的依赖项。这是您遇到异常的时候。

PostSharp 2.x 可以识别目标框架 4.5 并自动选择托管 CLR 4.0，但无法识别较新的框架版本 4.5.1，默认使用 CLR 2.0。

您可以通过将 MSBuild 属性 PostSharpTargetFrameworkVersion 设置为 4.0 来覆盖托管 CLR。​​