无法修复错误“无法加载 System.Net.Http，版本 = 4.2.0.0”答案

【问题标题】：Unable to fix error "Could not load System.Net.Http, Version=4.2.0.0"无法修复错误“无法加载 System.Net.Http，版本 = 4.2.0.0”
【发布时间】：2019-08-24 12:08:27
【问题描述】：

在我的生产服务器上出现错误：

无法加载文件或程序集 'System.Net.Http, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' 或其依赖项之一。系统找不到指定的文件。

在我的本地机器上它工作正常，但在服务器上它抛出上述错误，所以某处必须有一个丢失的文件。请参阅更新 3，其中我尝试添加丢失的 dll，然后引发不同的错误。

我按照这些链接中的说明进行操作：

正如最后一个链接中所述，我在我还不想迁移 (https://docs.microsoft.com/en-us/nuget/consume-packages/migrate-packages-config-to-package-reference) 的同一场景中，因为我不想遇到不兼容问题，我首先要修复当前问题。

我已经查找了System.Net.Http（以及其他一些）的所有引用并手动更改了版本号，这是我的 .vbproj 文件中的旧代码块：

<Reference Include="System.Net.Http, Version=4.1.1.3, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Net.Http.4.3.4\lib\net46\System.Net.Http.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>
<Reference Include="System.Runtime, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Runtime.4.3.0\lib\net462\System.Runtime.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>
<Reference Include="System.Runtime.Serialization" />
<Reference Include="System.Security.Cryptography.Algorithms, Version=4.2.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Security.Cryptography.Algorithms.4.3.0\lib\net463\System.Security.Cryptography.Algorithms.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>
<Reference Include="System.Security.Cryptography.Encoding, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Security.Cryptography.Encoding.4.3.0\lib\net46\System.Security.Cryptography.Encoding.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>
<Reference Include="System.Security.Cryptography.Primitives, Version=4.0.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Security.Cryptography.Primitives.4.3.0\lib\net46\System.Security.Cryptography.Primitives.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>
<Reference Include="System.Security.Cryptography.X509Certificates, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
  <HintPath>packages\System.Security.Cryptography.X509Certificates.4.3.0\lib\net461\System.Security.Cryptography.X509Certificates.dll</HintPath>
  <Private>True</Private>
  <Private>True</Private>
</Reference>

这是我最新的.vbproj 文件：

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.0\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props" Condition="Exists('packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.0\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" />
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProductVersion>
    </ProductVersion>
    <SchemaVersion>2.0</SchemaVersion>
    <ProjectGuid>{6455BF17-B42E-4854-96B1-D4D0E7767B0C}</ProjectGuid>
    <ProjectTypeGuids>{349c5851-65df-11da-9384-00065b846f21};{F184B08F-C81C-45F6-A57F-5ABD9991F28F}</ProjectTypeGuids>
    <OutputType>Library</OutputType>
    <RootNamespace>MyProject</RootNamespace>
    <AssemblyName>MyProject</AssemblyName>
    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
    <OptionExplicit>On</OptionExplicit>
    <OptionCompare>Binary</OptionCompare>
    <OptionStrict>Off</OptionStrict>
    <OptionInfer>On</OptionInfer>
    <MvcBuildViews>false</MvcBuildViews>
    <UseIISExpress>true</UseIISExpress>
    <Use64BitIISExpress />
    <IISExpressSSLPort>44316</IISExpressSSLPort>
    <IISExpressAnonymousAuthentication />
    <IISExpressWindowsAuthentication />
    <IISExpressUseClassicPipelineMode />
    <UseGlobalApplicationHostFile />
    <NuGetPackageImportStamp>
    </NuGetPackageImportStamp>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <DefineDebug>true</DefineDebug>
    <DefineTrace>true</DefineTrace>
    <OutputPath>bin\</OutputPath>
    <DocumentationFile>MyProject.xml</DocumentationFile>
    <NoWarn>42016,41999,42017,42018,42019,42032,42036,42020,42021,42022</NoWarn>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>pdbonly</DebugType>
    <DefineDebug>false</DefineDebug>
    <DefineTrace>true</DefineTrace>
    <Optimize>true</Optimize>
    <OutputPath>bin\</OutputPath>
    <DocumentationFile>MyProject.xml</DocumentationFile>
    <NoWarn>42016,41999,42017,42018,42019,42032,42036,42020,42021,42022</NoWarn>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="AjaxControlToolkit, Version=16.1.1.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\AjaxControlToolkit.dll</HintPath>
    </Reference>
    <Reference Include="aspnetforum, Version=7.2.7.0, Culture=neutral, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\aspnetforum.dll</HintPath>
    </Reference>
    <Reference Include="Hammock, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c148cfba29ed1a4d, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\Hammock.dll</HintPath>
    </Reference>
    <Reference Include="Hammock.ClientProfile, Version=1.0.0.0, Culture=neutral, PublicKeyToken=c148cfba29ed1a4d, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\Hammock.ClientProfile.dll</HintPath>
    </Reference>
    <Reference Include="HtmlAgilityPack, Version=1.7.1.0, Culture=neutral, PublicKeyToken=bd319b19eaf3b43a, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\HtmlAgilityPack.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.AspNet.FriendlyUrls, Version=1.0.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\Microsoft.AspNet.FriendlyUrls.dll</HintPath>
    </Reference>
    <Reference Include="Mollie, Version=2.0.2.0, Culture=neutral, processorArchitecture=MSIL">
      <HintPath>packages\Mollie.Net.2.0.2\lib\netstandard2.0\Mollie.dll</HintPath>
    </Reference>
    <Reference Include="Mollie.Api, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\Mollie.Api.dll</HintPath>
    </Reference>
    <Reference Include="MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\MySql.Data.dll</HintPath>
    </Reference>
    <Reference Include="Newtonsoft.Json, Version=12.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
      <HintPath>packages\Newtonsoft.Json.12.0.2\lib\net45\Newtonsoft.Json.dll</HintPath>
    </Reference>
    <Reference Include="PresentationCore" />
    <Reference Include="PresentationFramework" />
    <Reference Include="skmValidators, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\skmValidators.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.ComponentModel.Composition" />
    <Reference Include="System.Data" />
    <Reference Include="System.Drawing" />
    <Reference Include="System.IO, Version=4.1.1.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.IO.4.3.0\lib\net462\System.IO.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>

    <Reference Include="System.Net.Http, Version=4.3.4, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Net.Http.4.3.4\lib\net46\System.Net.Http.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>
    <Reference Include="System.Runtime, Version=4.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Runtime.4.3.0\lib\net462\System.Runtime.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>
    <Reference Include="System.Runtime.Serialization" />
    <Reference Include="System.Security.Cryptography.Algorithms, Version=4.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Security.Cryptography.Algorithms.4.3.0\lib\net463\System.Security.Cryptography.Algorithms.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>
    <Reference Include="System.Security.Cryptography.Encoding, Version=4.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Security.Cryptography.Encoding.4.3.0\lib\net46\System.Security.Cryptography.Encoding.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>
    <Reference Include="System.Security.Cryptography.Primitives, Version=4.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Security.Cryptography.Primitives.4.3.0\lib\net46\System.Security.Cryptography.Primitives.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>
    <Reference Include="System.Security.Cryptography.X509Certificates, Version=4.3.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>packages\System.Security.Cryptography.X509Certificates.4.3.0\lib\net461\System.Security.Cryptography.X509Certificates.dll</HintPath>
      <Private>True</Private>
      <Private>True</Private>
    </Reference>

    <Reference Include="System.Core" />
    <Reference Include="System.Web" />
    <Reference Include="System.Web.Services" />
    <Reference Include="System.EnterpriseServices" />
    <Reference Include="System.Net.Http.WebRequest">
    </Reference>
    <Reference Include="System.Web.Helpers, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.WebPages.3.2.7\lib\net45\System.Web.Helpers.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.Mvc, Version=5.2.7.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.Mvc.5.2.7\lib\net45\System.Web.Mvc.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.Optimization">
      <HintPath>packages\Microsoft.AspNet.Web.Optimization.1.1.3\lib\net40\System.Web.Optimization.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.Razor.3.2.7\lib\net45\System.Web.Razor.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.WebPages, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.WebPages.3.2.7\lib\net45\System.Web.WebPages.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.WebPages.Deployment, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.WebPages.3.2.7\lib\net45\System.Web.WebPages.Deployment.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL">
      <Private>True</Private>
      <HintPath>packages\Microsoft.AspNet.WebPages.3.2.7\lib\net45\System.Web.WebPages.Razor.dll</HintPath>
    </Reference>
    <Reference Include="TweetSharp, Version=2.0.0.0, Culture=neutral, PublicKeyToken=c148cfba29ed1a4d, processorArchitecture=MSIL">
      <SpecificVersion>False</SpecificVersion>
      <HintPath>bin\TweetSharp.dll</HintPath>
    </Reference>
    <Reference Include="WebGrease">
      <Private>True</Private>
      <HintPath>packages\WebGrease.1.6.0\lib\WebGrease.dll</HintPath>
    </Reference>
    <Reference Include="Antlr3.Runtime">
      <Private>True</Private>
      <HintPath>packages\Antlr.3.5.0.2\lib\Antlr3.Runtime.dll</HintPath>
    </Reference>
    <Reference Include="WindowsBase" />
  </ItemGroup>
  <ItemGroup>
    <Reference Include="Newtonsoft.Json">
      <HintPath>packages\Newtonsoft.Json.11.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
    </Reference>
    <Reference Include="System.Net.Http.Formatting">
      <HintPath>packages\Microsoft.AspNet.WebApi.Client.5.2.7\lib\net45\System.Net.Http.Formatting.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.Http">
      <HintPath>packages\Microsoft.AspNet.WebApi.Core.5.2.7\lib\net45\System.Web.Http.dll</HintPath>
    </Reference>
    <Reference Include="System.Web.Http.WebHost">
      <HintPath>packages\Microsoft.AspNet.WebApi.WebHost.5.2.7\lib\net45\System.Web.Http.WebHost.dll</HintPath>
    </Reference>
    <Reference Include="Microsoft.CodeDom.Providers.DotNetCompilerPlatform">
      <HintPath>packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.0\lib\net45\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.dll</HintPath>
    </Reference>
  </ItemGroup>
  <ItemGroup>
    <Import Include="System" />
    <Import Include="System.Collections" />
    <Import Include="System.Collections.Generic" />
    <Import Include="System.Data" />
    <Import Include="System.Linq" />
    <Import Include="System.Xml.Linq" />
    <Import Include="System.Diagnostics" />
    <Import Include="System.Collections.Specialized" />
    <Import Include="System.Configuration" />
    <Import Include="System.Text" />
    <Import Include="System.Text.RegularExpressions" />
    <Import Include="System.Web" />
    <Import Include="System.Web.Caching" />
    <Import Include="System.Web.Mvc" />
    <Import Include="System.Web.Mvc.Ajax" />
    <Import Include="System.Web.Mvc.Html" />
    <Import Include="System.Web.Routing" />
    <Import Include="System.Web.SessionState" />
    <Import Include="System.Web.Security" />
    <Import Include="System.Web.Profile" />
    <Import Include="System.Web.UI" />
    <Import Include="System.Web.UI.WebControls" />
    <Import Include="System.Web.UI.WebControls.WebParts" />
    <Import Include="System.Web.UI.HtmlControls" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="App_Data\" />
    <Folder Include="App_WebReferences\" />
    <Folder Include="Models\" />
  </ItemGroup>
  <PropertyGroup>
    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
  </PropertyGroup>
  <Import Project="$(MSBuildBinPath)\Microsoft.VisualBasic.targets" />
  <Import Project="$(VSToolsPath)\WebApplications\Microsoft.WebApplication.targets" Condition="'$(VSToolsPath)' != ''" />
  <Import Project="$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v10.0\WebApplications\Microsoft.WebApplication.targets" Condition="false" />
  <Target Name="MvcBuildViews" AfterTargets="AfterBuild" Condition="'$(MvcBuildViews)'=='true'">
    <AspNetCompiler VirtualPath="temp" PhysicalPath="$(WebProjectOutputDir)" />
  </Target>
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.0\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props')" Text="$([System.String]::Format('$(ErrorText)', 'packages\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.2.0.0\build\net46\Microsoft.CodeDom.Providers.DotNetCompilerPlatform.props'))" />
  </Target>
  <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
       Other similar extension points exist, see Microsoft.Common.targets.
  <Target Name="BeforeBuild">
  </Target>
  <Target Name="AfterBuild">
  </Target> -->
</Project>

我的packages.config

<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Antlr" version="3.5.0.2" targetFramework="net472" />
  <package id="bootstrap" version="3.4.1" targetFramework="net472" />
  <package id="jQuery" version="3.3.1" targetFramework="net472" />
  <package id="jQuery.Validation" version="1.17.0" targetFramework="net472" />
  <package id="Microsoft.AspNet.Mvc" version="5.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.Razor" version="3.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net472" />
  <package id="Microsoft.AspNet.WebApi" version="5.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.7" targetFramework="net472" />
  <package id="Microsoft.AspNet.WebPages" version="3.2.7" targetFramework="net472" />
  <package id="Microsoft.CodeDom.Providers.DotNetCompilerPlatform" version="2.0.0" targetFramework="net472" />
  <package id="Microsoft.jQuery.Unobtrusive.Validation" version="3.2.11" targetFramework="net472" />
  <package id="Microsoft.Web.Infrastructure" version="1.0.0.0" targetFramework="net472" />
  <package id="Modernizr" version="2.8.3" targetFramework="net472" />
  <package id="Mollie.Net" version="2.0.2" targetFramework="net472" />
  <package id="Newtonsoft.Json" version="12.0.2" targetFramework="net472" />
  <package id="System.IO" version="4.3.0" targetFramework="net472" />
  <package id="System.Net.Http" version="4.3.4" targetFramework="net472" />
  <package id="System.Runtime" version="4.3.0" targetFramework="net472" />
  <package id="System.Security.Cryptography.Algorithms" version="4.3.0" targetFramework="net472" />
  <package id="System.Security.Cryptography.Encoding" version="4.3.0" targetFramework="net472" />
  <package id="System.Security.Cryptography.Primitives" version="4.3.0" targetFramework="net472" />
  <package id="System.Security.Cryptography.X509Certificates" version="4.3.0" targetFramework="net472" />
  <package id="WebGrease" version="1.6.0" targetFramework="net472" />
</packages>

我还在我的 web.config（包含 assemblyBindings）中注释掉了整个 <runtime> 部分。

但错误仍然存在，我还能做什么？

更新 1

根据@welotty 的回答，我做了以下事情：

我从 VS2019 开发人员命令提示符运行 fuslogvw，但我只看到并清空窗口（没有应用程序）：

我看不到在哪里可以为我的特定应用选择要分析的目录或任何其他设置。

更新 2

根据@welotty 的评论，我让fuslogvw 运行。我清除了所有消息，在 Visual Studio 2019 中构建了我的应用程序，现在看到了这个（没有提到 System.Net.Http）：

我打开了System.IO 日志，我在日志下面看到了这个，但也没有提到System.Net.Http)

*** Assembly Binder Log Entry  (24-Aug-2019 @ 4:47:53 PM) ***

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Running under executable  C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\MSBuild.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: DisplayName = System.IO
 (Partial)
WRN: Partial binding information was supplied for an assembly:
WRN: Assembly Name: System.IO | Domain ID: 1
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:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = MSBuild.exe
Calling assembly : Microsoft.Build.Tasks.Core, Version=15.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\MSBuild.exe.Config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework\v4.0.30319\config\machine.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:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/System.IO.DLL.
LOG: Attempting download of new URL file:///C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/System.IO/System.IO.DLL.
LOG: Attempting download of new URL file:///C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/System.IO.EXE.
LOG: Attempting download of new URL file:///C:/Program Files (x86)/Microsoft Visual Studio/2019/Community/MSBuild/Current/Bin/System.IO/System.IO.EXE.
LOG: All probing URLs attempted and failed.

*** Assembly Binder Log Entry  (24-Aug-2019 @ 4:47:53 PM) ***

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

首先：我将如何解决这些问题？日志状态为The system cannot find the file specified，其次：我认为这与我的实际问题无关？

更新 3

我注意到我的生产服务器上的bin 文件夹中实际上缺少System.Net.Http.dll。所以我从本地机器上复制了 dll。但是，然后我收到错误：

无法加载要执行的参考程序集。

我检查了here，但对于像将新 dll 添加到 bin 文件夹这样简单的事情来说，这似乎非常复杂。不确定是否重要，但我的产品服务器没有文件夹：C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.7.2。

为什么会出现这个错误？

【问题讨论】：

这发生在构建时？还是运行时间？ msbuild 根本不应该参与。
它发生在构建时。当我在运行时进行测试时，我单击按钮的那一刻应该会发生重定向（这不会发生，可能是因为 system.net.http 的问题）根本没有记录任何内容。
当我遇到这种情况时，我从 Visual Studio 的 NuGet 包控制台窗口运行命令 Update-Package -reinstall。当库丢失、未更新、不是预期版本或与 web/app.config 中出现的绑定不匹配时，似乎会发生这种情况。
在黑暗中拍摄，但是重新安装 .net 4.7.2 开发人员包怎么样？ dotnet.microsoft.com/download/dotnet-framework/net472
难以置信...必须在 prod 服务器上安装 4.7.2。现在它起作用了。把它作为你的答案，我会把它标记为正确的。谢谢！

标签： vb.net .net-assembly system.net packages.config

【解决方案1】：

我知道这是旧的，但我今天遇到了一个 .net 4.8 项目。我能够找到问题所在，对我来说，我正在通过 Swashbuckle 使用 Swagger。它使用需要 System.Net.Http v4.0.0.0 的 WebActivatorEx，绑定将其重定向到最新版本 4.2.0.0，所以这是我的修复。在我的 web.config 中。请注意，newVersion 不是最新的，而是 WebActivator Ex 使用和要求的。

  <dependentAssembly>
    <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.0.0.0" />
  </dependentAssembly>

【讨论】：

【解决方案2】：

您是否为 4.7.2 安装了适当的框架/开发者包？

dotnet.microsoft.com/download/dotnet-framework/net472

【讨论】：

【解决方案3】：

这不能回答您的问题，但我很幸运使用 fuslogvw 来追踪此类问题。它默认安装在 Visual Studio 中，并记录在

https://docs.microsoft.com/en-us/dotnet/framework/tools/fuslogvw-exe-assembly-binding-log-viewer

一旦你运行它（它很简单，你可以将它复制到另一台机器而无需安装任何东西），它会告诉你问题发生的确切原因：

该工具显示有关所选绑定失败的以下详细信息：

绑定失败的具体原因，如“找不到文件”或“版本不匹配”。

有关启动绑定的应用程序的信息，包括其名称、应用程序的根目录 (AppBase) 以及私有搜索路径的描述（如果有）。

工具正在寻找的程序集的标识。

对已应用的任何应用程序、发布者或管理员版本策略的描述。

是否在全局程序集缓存中找到程序集。

所有探测 URL 的列表。

【讨论】：

谢谢！看起来像我需要的。但是，我遇到了一个问题，请参阅我的帖子中的更新 1
ha -- 我猜我给你的链接没有说明。要记录东西——准备好所有东西来复制错误（这样你就不会得到一个巨大的日志），然后确保你以管理员身份打开了 fuslogvw，点击设置，然后“记录所有绑定到磁盘”。一旦你这样做了，重现错误，然后点击“刷新”按钮。（完成后别忘了关闭日志）