如何在.NET Core项目中添加C++库

Question

如何在.NET Core项目(类库)中添加C++库的方法.我尝试创建一个nuget包但不起作用.我收到了这个错误:

An unhandled exception of type 'System.DllNotFoundException' occurred in "NameOfDll.dll"

当我添加nuget包时,project.json添加以下引用:

  "dependencies": {
    "Core": "1.0.0-*",
    "NETStandard.Library": "1.6.0",
    "NameOfDll.dll": "1.0.0"
  },

Answer 1

dependencies属性project.json指定包依赖关系,因为此NuGet处理NameOfDll.dll为包ID,但不是dll名称.

要将库中的原生C++ dll添加到NuGet包中,.xproj您应该执行以下步骤:

1. 把你NameOfDll.dll的\lib目录放在附近MyClassLibrary.xproj

2. 打开project.json文件并添加:

   "packOptions": {
     "files" : {
       "includeFiles" : "lib/NameOfDll.dll"
     }
   }
   

3. 执行 dotnet pack

NameOfDll.dll将被包含在路径下的NuGet包中lib\NameOfDll.dll.

要将本机C++ dll添加到.csproj库的NuGet包中,您应该执行以下步骤:

1. 我假设您有名称的托管项目MyClassLibrary.csproj.
2. 使用nuget spec命令为您的类库创建新的NuGet包.
3. 创建\lib,\build,\content和\tools附近的目录MyClassLibrary.nuspec.
4. 将所有本机dll复制到该\build文件夹中.
5. 将复制的本机dll的扩展名更改为.native.

6. MyClassLibrary.targets在\build文件夹内创建以下内容:

   <?xml version="1.0" encoding="utf-8"?>
   <Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
     <ItemGroup>
       <AvailableItemName Include="NativeBinary" />
     </ItemGroup>
     <ItemGroup>
       <NativeBinary Include="$(MSBuildThisFileDirectory)*">
         <TargetPath></TargetPath>
       </NativeBinary>
     </ItemGroup>
     <PropertyGroup>
       <PrepareForRunDependsOn>
         $(PrepareForRunDependsOn);
         CopyNativeBinaries
       </PrepareForRunDependsOn>
     </PropertyGroup>
     <Target Name="CopyNativeBinaries" DependsOnTargets="CopyFilesToOutputDirectory">
       <Copy SourceFiles="@(NativeBinary)"
             DestinationFiles="@(NativeBinary->'$(OutDir)\%(TargetPath)\%(Filename).dll')"
             Condition="'%(Extension)'=='.native'">
         <Output TaskParameter="DestinationFiles" ItemName="FileWrites" />
       </Copy>
       <Copy SourceFiles="@(NativeBinary)"
             DestinationFiles="@(NativeBinary->'$(OutDir)\%(TargetPath)\%(Filename).%(Extension)')"
             Condition="'%(Extension)'!='.native'">
         <Output TaskParameter="DestinationFiles" ItemName="FileWrites" />
       </Copy>
     </Target>
   </Project>
   

   提示:.targets内容取自此问题.上述.targets文件将在NuGet包的安装中注入到目标项目文件中.

7. 将以下行添加到您的MyClassLibrary.nuspec:

   <files>
     <file src="lib\" target="lib" />
     <file src="tools\" target="tools" />
     <file src="content\" target="content" />
     <file src="build\" target="build" />
   </files>
   

8. 执行nuget pack MyClassLibrary.csproj以构建NuGet包.