How is the way to add a C++ Library in a .NET Core project (Class Library). I tried creating a nuget package but doesn't work. I got this error:
An unhandled exception of type 'System.DllNotFoundException' occurred in "NameOfDll.dll"
When I add the nuget package the project.json add the following reference:
"dependencies": {
"Core": "1.0.0-*",
"NETStandard.Library": "1.6.0",
"NameOfDll.dll": "1.0.0"
},
dependencies attribute in project.json
specifies package dependencies, because of this NuGet handles NameOfDll.dll
as a package ID, but not as a dll name.
To add native C++ dlls into you NuGet package for .xproj
library you should do the following steps:
NameOfDll.dll
in \lib
directory near MyClassLibrary.xproj
Open project.json
file and add there:
"packOptions": {
"files" : {
"includeFiles" : "lib/NameOfDll.dll"
}
}
Execute dotnet pack
NameOfDll.dll
will be included into NuGet package under the path lib\NameOfDll.dll
.
To add native C++ dlls into your NuGet package for .csproj
library you should do the following steps:
MyClassLibrary.csproj
.nuget spec
command.\lib
, \build
, \content
and \tools
directories near MyClassLibrary.nuspec
.\build
folder..native
.Create MyClassLibrary.targets
with the following content inside \build
folder:
<?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>
Hint: The .targets
content is taken from this question.
The above .targets
file will be injected on an installation of the NuGet package into the target project file.
Add the following lines into your MyClassLibrary.nuspec
:
<files>
<file src="lib\" target="lib" />
<file src="tools\" target="tools" />
<file src="content\" target="content" />
<file src="build\" target="build" />
</files>
Execute nuget pack MyClassLibrary.csproj
to build your NuGet package.
Here is a one-click way to do it in .net core 2. I used it in my website and it works.
Right click your project in Solution Explorer, select Add->Existing Item, browse and choose your dll (select show all extensions). Then your dll will appear in Solution explorer.
In the Solution Explorer, right-click your dll -> Properties. Set build action: Content, and Copy to Output Directory: Copy if newer (or always copy).
It's done. Use your dll in your code staightforward like this:
[DllImport("my_dll.dll", CallingConvention = CallingConvention.Cdecl)]
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