将 .net Framework 项目与 .net Core 项目（和语言）混合 - System.IO.FileNotFoundException

Question

我有一个解决方案，其中大部分项目都是 VB.net 项目，它们都以 .NET Framework 4.8 为目标。所有这些特定项目都可以正确编译，并且运行正在生产中。

我添加了一个面向 .net 标准 2.0 的 C# 项目。这个特定项目的主要原因是创建一个可以处理剃刀模板的组件（当然给定一个模型）以便使用 RazorLight_wik8wz nuget 包创建输出文件（我真的不在乎我使用哪个包只要我可以在内存中渲染一个剃刀模板，因为 model/template 对生成的输出可能会在不同情况下保存在不同的地方。

理论上，根据我的理解，我应该能够从我的其他 .net Framework 4.8 项目中引用和使用 .net standard 2.0 库项目。但是，我似乎无法让它工作（即使一切都编译并且运行s）。

我已经尝试了几个基于 RazorLight 的不同包——但是当我尝试使用它们时我得到了相似的结果。我只是不确定我是否遇到了错误，或者我是否没有正确地做某事。

C# 项目名为 "JobOutputGenerator." 我已经添加了名为 "RazorLight_wik8wz" 的 nuget 包并创建了一个名为 object 的 JobOutput，目前看起来像这样：

using System.Threading.Tasks;
using RazorLight;

public class JobOutput
{
    public static async Task<byte[]> CreateOutputAsync(string RazorTemplate, object Model)
    {
        RazorLightEngine engine = new RazorLightEngineBuilder().UseMemoryCachingProvider().Build();
        return System.Text.Encoding.ASCII.GetBytes(await engine.CompileRenderAsync(RazorTemplate.GetHashCode().ToString() + Model.GetHashCode().ToString(), RazorTemplate, Model));
    }

}

我创建了另一个名为 "TesterApp" 的项目，这是一个针对 .NET Framework 4.8 的 VB.NET 项目。这是一个引用 JobOutputGenerator 的简单 windows 表单项目。

我有一个按钮可以执行以下操作：

Private Sub btnRenderSample_Click(sender As Object, e As EventArgs) Handles btnRenderSample.Click
    Dim template As String = "Hello @Model.Name"
    Dim Model1 = New With {.Name = "John Doe"}
    Dim bytesTask = JobOutput.CreateOutputAsync(template, Model1)
    Dim str = System.Text.Encoding.ASCII.GetString(bytesTask.Result)
    MsgBox(str)
End Sub

当我在 Visual Studio 中以调试模式启动 TesterApp 时，所有项目都编译得很好，然后当我单击我的示例按钮时，Visual Studio 在线中断（同时以绿色突出显示） :

Dim bytesTask = JobOutput.CreateOutputAsync(template, Model1)

带有一个标题为 "Exception Unhandled" 的框，上面写着：

System.IO.FileNotFoundException: 'Could not load file or assembly 'RazorLight, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.'

我有运行 fuslogvw 并且 TesterApp 没有问题定位 JobOutputGenerator.dll:

<meta http-equiv="Content-Type" content="charset=unicode-1-1-utf-8"><!-- saved from url=(0015)assemblybinder: --><html><pre>
*** Assembly Binder Log Entry  (6/7/2019 @ 9:37:08 AM) ***

The operation was successful.
Bind result: hr = 0x0. The operation completed successfully.

Assembly manager loaded from:  C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll
Running under executable  X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\TesterApp.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: DisplayName = JobOutputGenerator, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = TesterApp.exe
Calling assembly : TesterApp, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\TesterApp.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:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/JobOutputGenerator.DLL.
LOG: Assembly download was successful. Attempting setup of file: X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\JobOutputGenerator.dll
LOG: Entering run-from-source setup phase.
LOG: Assembly Name is: JobOutputGenerator, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
LOG: Binding succeeds. Returns assembly from X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\JobOutputGenerator.dll.
LOG: Assembly is loaded in default load context.

</pre></html>

不过，我确实在 fuslogvw 中找到了这个 "gem"，但我不知道该怎么办：

*** Assembly Binder Log Entry  (6/7/2019 @ 9:37:09 AM) ***

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  X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\TesterApp.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: DisplayName = RazorLight, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = TesterApp.exe
Calling assembly : JobOutputGenerator, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: X:\Workspaces\SOLUTIONROOTFOLDER\TesterApp\bin\Debug\TesterApp.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:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/RazorLight.DLL.
LOG: Attempting download of new URL file:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/RazorLight/RazorLight.DLL.
LOG: Attempting download of new URL file:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/RazorLight.EXE.
LOG: Attempting download of new URL file:///X:/Workspaces/SOLUTIONROOTFOLDER/TesterApp/bin/Debug/RazorLight/RazorLight.EXE.
LOG: All probing URLs attempted and failed.

以下是JobOutputGenerator.csproj的内容：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup Label="Globals">
    <SccProjectName>SAK</SccProjectName>
    <SccProvider>SAK</SccProvider>
    <SccAuxPath>SAK</SccAuxPath>
    <SccLocalPath>SAK</SccLocalPath>
  </PropertyGroup>

  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
  </PropertyGroup>

  <PropertyGroup>
    <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
  </PropertyGroup>


  <ItemGroup>
    <PackageReference Include="ILRepack.MSBuild.Task" Version="2.0.1" />
    <PackageReference Include="RazorLight_wik8wz" Version="2.0.0" />
  </ItemGroup>

      <Target Name="ILRepack" AfterTargets="Build">

        <PropertyGroup>
            <WorkingDirectory>$(MSBuildThisFileDirectory)bin$(Configuration)$(TargetFramework)</WorkingDirectory>
        </PropertyGroup>

        <ILRepack 
            OutputType="$(OutputType)" 
            MainAssembly="$(AssemblyName).dll" 
            OutputAssembly="$(AssemblyName).dll" 
            InputAssemblies="$(WorkingDirectory)\*.dll" 
            WilcardInputAssemblies="true"
            WorkingDirectory="$(WorkingDirectory)" />
    </Target>
</Project>

Answer 1

所以经过更多的搜索，我遇到了以下问题和一组帖子。遵循此解决方法似乎暂时解决了我的问题。

显然，这个问题已经存在很长一段时间了（自 2017 年以来——感谢 Microsoft！），没有永久修复。

问题首先报告于此：

NuGet dependencies of .NET Standard library referenced from classic .NET app cannot be resolved at runtime with FileNotFoundException #1582

如果你通读这串信息，你最终会得到这个 workaround 靠近底部，其他人证实了此人的发现。遵循此解决方法会导致 DLL 文件全部 built/copied 到 Debug 文件夹，现在引用的 DLL 不再 "missing" 并且我在运行时收到的异常消失了。

我对我的 JobOutputGenerator .csproj 文件进行了 this 修改，只是我使用了 ;net48 而不是 ;net461 。

注意标签：

<TargetFramework>

需要改为（注意"s"）

<TargetFrameworks>

为了使其正常工作——否则您的项目将无法在 Visual Studio 中正确加载。

将 .net Framework 项目与 .net Core 项目（和语言）混合 - System.IO.FileNotFoundException

Mixing .net Framework projects with .net Core projects (and languages) - System.IO.FileNotFoundException

c#

vb.net

.net-standard-2.0

.net-4.7.1

.net-core-2.2