I tried with and without the ClassInterface and Guid attributes.
In the .csproj file I added these:
<ProjectSdk="Microsoft.NET.Sdk"><PropertyGroup><TargetFramework>net5.0</TargetFramework><!-- Indicate the assembly is providing a COM server --><EnableComHosting>true</EnableComHosting><EnableRegFreeCom>true</EnableRegFreeCom></PropertyGroup><PropertyGroupCondition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'"><PlatformTarget>x86</PlatformTarget></PropertyGroup><ItemGroup><PackageReferenceInclude="Hl7.Fhir.R4"Version="3.6.0"/></ItemGroup></Project>
I compiled for x86 and I got these files (and some more):
The problem is that I don't manage to register this component. tlbexp xxx.InterOp.dll gives me this error:
TlbExp : error TX0000 : Type library exporter encountered an error while processing 'hdmpcloud.ehealth.FhirTools.InterOp.Convertor, hdmpcloud.ehealth.FhirTools.InterOp'. Error: Type library exporter cannot load type 'hdmpcloud.ehealth.FhirTools.InterOp.Convertor' (error: Could not load file or assembly 'System.Runtime, Version=22.214.171.124, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. (Exception from HRESULT: 0x80070002)).
regasm /tlb xxx.InterOp.comhost.dll gives me
RegAsm : error RA0000 : Failed to load 'C:_projects\HDMP\hdmpcloud.ehealth.FhirTools\InterOp\hdmpcloud.ehealth.FhirTools.InterOp\bin\Debug\net5.0\hdmpcloud.ehealth.FhirTools.InterOp.comhost.dll' because it is not a valid .NET assembly
I want to call this component from a Delphi program (unmanaged code).
Unfortunately it doesn't help. It seems that regasm doesn't recognize .NET 5 assemblies. Regsvr32 does, and it registers the component / interface / library, but no TLB is generated. That makes it virtually useless.
From Exposing .NET Core components to COM | Microsoft Docs :
Unlike in .NET Framework, there is no support in .NET Core or .NET 5+ for generating a COM Type Library (TLB) from a .NET assembly. The guidance is to either manually write an IDL file or a C/C++ header for the native declarations of the COM interfaces.
So now I'm investigating how to create / compile / use the correct IDL file. Should anyone have some good pointers for that, let me know
I was under the assumption that creating a COM component would still be as easy under .NET 5 as under the previous versions. We don't need real time at all.
This would be part of a conversion program, that will run on the client PCs (> 3000 clients, with all sorts of PCs and OS's). I wanted to avoid having to serialize objects on the Delphi side, and to deserialize them on the .NET side. I think that we will resort to creating a file (or a couple of files) in a folder, and when that is done running the conversion program on the client PC. That way we only have to install .NET 5 and the conversion program, which is even easier than using a queue.
Thank you for thinking with me for solutions!
I am going to do 1 more try, posting the same question on SO. Please don't be insulted If I find a solution I will post it here.
According to the replies on SO this is a dead end indeed.
We now are going to create classes in C# and in Delphi with all the same properties. We'll then serialize the Delphi classes to JSON, and deserialize them in C#.
For this I'm writing a code generator that will use a DSL to describe the classes. It's a work-around, but at least we'll get the work done.
This is for a conversion, so the Delphi side will serialize the objects in a folder, and the .NET part will deserialize it and handle it further.
It is a One Shot operation, so no need for fancy stuff there.
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