使用 MEF 导入 C++/CLI dll

Question

我有一个 C# 接口和一个 C++\CLI 实现，我想在我的托管代码中使用它们。

C# 代码：

public interface IEngine
{
    void Run();
}

C++\CLI 代码：

[Export(IEngine::typeid)]
public ref class Engine : public IEngine
{
    public:
        virtual void Run(){}
};

C# 加载程序：

public class Loader
{
    public IEngine Load()
    {
        var path = @"D:\Engine\Dlls";
        var catalog = new AggregateCatalog(
                    newAssemblyCatalog(Assembly.GetExecutingAssembly().Location), 
                    new DirectoryCatalog(path, "*.dll"));
        var m_container = new CompositionContainer(catalog);
        return m_container.GetExportedValue<IEngine>();
    }
}

我希望能够通过字面名称或对象名称（如上所述）加载 .dll。
当我调用 ReflectionTypeLoadException 类型的 GetExportedValue 时，上面的代码抛出错误：

 InnerException = null   
 Message = "Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information."
 Source = "mscorlib"

此外，在 LoaderExceptions 中有 12 个例外（全部相同）：

[System.IO.FileNotFoundException]   {System.IO.FileNotFoundException: Could not load file or assembly 'GNetTcp, Version=1.0.0.23326, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
File name: 'GNetTcp, Version=1.0.0.23326, Culture=neutral, PublicKeyToken=null'

=== Pre-bind state information ===
LOG: DisplayName = GNetTcp, Version=1.0.0.23326, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///D:/NovaSW/Selective_Modeling_45/Engine/Sources/Algorithms/Algs/SelectiveModeling45Tests/bin/Debug
LOG: Initial PrivatePath = NULL
Calling assembly : ComputationDataTypes, Version=7.2.0.1, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in LoadFrom load context.
WRN: Native image will not be probed in LoadFrom context. Native image will only be probed in default load context, like with Assembly.Load().
LOG: Using application configuration file: C:\Users\rotem-o\AppData\Local\Tempknkp2kk.w3r533983-b3f6-4ca4-bb72-9f8ea4a2e2a3.config
LOG: Using host configuration file: 
LOG: Using machine configuration file from C:\Windows\Microsoft.NET\Framework64\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:///D:/NovaSW/Selective_Modeling_45/Engine/Sources/Algorithms/Algs/SelectiveModeling45Tests/bin/Debug/GNetTcp.DLL.
LOG: Attempting download of new URL file:///D:/NovaSW/Selective_Modeling_45/Engine/Sources/Algorithms/Algs/SelectiveModeling45Tests/bin/Debug/GNetTcp/GNetTcp.DLL.
LOG: Attempting download of new URL file:///D:/NovaSW/Selective_Modeling_45/Engine/Sources/Algorithms/Algs/SelectiveModeling45Tests/bin/Debug/GNetTcp.EXE.
LOG: Attempting download of new URL file:///D:/NovaSW/Selective_Modeling_45/Engine/Sources/Algorithms/Algs/SelectiveModeling45Tests/bin/Debug/GNetTcp/GNetTcp.EXE.
LOG: Attempting download of new URL file:///D:/NOVASW/SELECTIVE_MODELING_45/OUTPUT/BINARIES/REFERENCES/DLLSENGINE/GNetTcp.DLL.
LOG: Attempting download of new URL file:///D:/NOVASW/SELECTIVE_MODELING_45/OUTPUT/BINARIES/REFERENCES/DLLSENGINE/GNetTcp/GNetTcp.DLL.
LOG: Attempting download of new URL file:///D:/NOVASW/SELECTIVE_MODELING_45/OUTPUT/BINARIES/REFERENCES/DLLSENGINE/GNetTcp.EXE.
LOG: Attempting download of new URL file:///D:/NOVASW/SELECTIVE_MODELING_45/OUTPUT/BINARIES/REFERENCES/DLLSENGINE/GNetTcp/GNetTcp.EXE.
}   System.IO.FileNotFoundException

我找不到使用界面和 managed\unmanaged.dll 加载的教程。有知道的请私信我

我应该如何使用它，我做错了什么？

Answer 1

Fusion 日志告诉您出了什么问题。

WRN: Native image will not be probed in LoadFrom context.

C++/CLI 图像是混合模式，由于加载它可能会有副作用（DllMain 执行），MEF 不会冒险。您仍然可以显式加载程序集。

使用 MEF 导入 C++/CLI dll

Import C++/CLI dll using MEF

c#

dll

mef

c++-cli