问题描述
根据 NuGet，我正在处理的项目安装了 System.Net.Http 版本 4.3.3.它在 Web.config 文件中有一个绑定重定向，可将其重定向到 4.2.0.0 版本，但出于某种原因，该重定向有效:
The project I'm working on has System.Net.Http version 4.3.3 installed, according to NuGet. It had a binding redirect in the Web.config file to redirect it to version 4.2.0.0, which worked for some reason:
<dependentAssembly>
<assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0" />
</dependentAssembly>
我将其更改为指向 4.3.3.0，即 NuGet 所说的已安装版本:
I changed it to point to 4.3.3.0 which is the version NuGet says is installed:
<dependentAssembly>
<assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-4.3.3.0" newVersion="4.3.3.0" />
</dependentAssembly>
...但是现在当我尝试调试 ASP.NET 站点时出现此错误:
... but now I get this error when I try to debug the ASP.NET site:
Could not load file or assembly 'System.Net.Http' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
=== Pre-bind state information ===
LOG: DisplayName = System.Net.Http
(Partial)
WRN: Partial binding information was supplied for an assembly:
WRN: Assembly Name: System.Net.Http | Domain ID: 2
WRN: A partial bind occurs when only part of the assembly display name is provided.
WRN: This might result in the binder loading an incorrect assembly.
WRN: It is recommended to provide a fully specified textual identity for the assembly,
WRN: that consists of the simple name, version, culture, and public key token.
WRN: See whitepaper http://go.microsoft.com/fwlink/?LinkId=109270 for more information and common solutions to this issue.
LOG: Appbase = file:///C:/.../Dev/Src/Web/PortalSite/
LOG: Initial PrivatePath = C:...DevSrcWebPortalSitein
Calling assembly : (Unknown).
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:...DevSrcWebPortalSiteweb.config
LOG: Using host configuration file: C:...DocumentsIISExpressconfigaspnet.config
LOG: Using machine configuration file from C:WindowsMicrosoft.NETFrameworkv4.0.30319configmachine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/.../AppData/Local/Temp/Temporary ASP.NET Files/vs/e31848dc/3694ba06/System.Net.Http.DLL.
LOG: Attempting download of new URL file:///C:/.../AppData/Local/Temp/Temporary ASP.NET Files/vs/e31848dc/3694ba06/System.Net.Http/System.Net.Http.DLL.
LOG: Attempting download of new URL file:///C:/.../Dev/Src/Web/PortalSite/bin/System.Net.Http.DLL.
LOG: Using application configuration file: C:...DevSrcWebPortalSiteweb.config
LOG: Using host configuration file: C:...DocumentsIISExpressconfigaspnet.config
LOG: Using machine configuration file from C:WindowsMicrosoft.NETFrameworkv4.0.30319configmachine.config.
LOG: Redirect found in application configuration file: 4.2.0.0 redirected to 4.3.3.0.
LOG: Post-policy reference: System.Net.Http, Version=4.3.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
LOG: Attempting download of new URL file:///C:/.../AppData/Local/Temp/Temporary ASP.NET Files/vs/e31848dc/3694ba06/System.Net.Http.DLL.
LOG: Attempting download of new URL file:///C:/.../AppData/Local/Temp/Temporary ASP.NET Files/vs/e31848dc/3694ba06/System.Net.Http/System.Net.Http.DLL.
LOG: Attempting download of new URL file:///C:/.../Dev/Src/Web/PortalSite/bin/System.Net.Http.DLL.
WRN: Comparing the assembly name resulted in the mismatch: Minor Version
ERR: Failed to complete setup of assembly (hr = 0x80131040). Probing terminated.
为了让事情变得更加混乱，该站点的 bin 目录中的 DLL 版本似乎又有所不同:
To make things even more confusing, the DLL version in the bin directory for the site seems to be different again:
PS C:...DevSrcWebPortalSitein> (Get-Item ...inDebugSystem.Net.Http.dll).VersionInfo
ProductVersion FileVersion FileName
-------------- ----------- --------
4.6.25908.02 ... 4.6.25908.02 C:...DevSrcWebPortalSiteinSystem.Net.Http.dll
这是怎么回事?重定向以前是如何工作的，为什么现在不能工作?
What's up with this? How did the redirect work before, and why doesn't it work now?
推荐答案
原来我的bin目录下的DLL版本其实是4.2.0.0版本，也就是显然是与 Visual Studio 2017 捆绑在一起的，并且 NuGet 包版本 4.3.3 中分发的版本是 DLL 版本 4.1.1.2，根本没有使用.令人困惑！但这解释了为什么重定向到 DLL 版本 4.2.0.0 有效而重定向到 4.3.0.0 无效.
It turns out that the DLL version in my bin directory was actually version 4.2.0.0, which is apparently bundled with Visual Studio 2017, and the version distributed in NuGet package version 4.3.3 is DLL version 4.1.1.2, which wasn't being used at all. Confusing! But this explains why the redirect to DLL version 4.2.0.0 worked and redirecting to 4.3.0.0 didn't.
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