'System.ServiceModel not found in .NET Core project

I have a .NET Core xUnit project. I'm trying to call a WCF service from it but get the following exception:

System.InvalidOperationException occurred
  HResult=0x80131509
  Message=An error occurred while loading attribute 'ServiceContractAttribute' on type 'IMyContract'.  Please see InnerException for more details.

Inner Exception 1:
FileNotFoundException: Could not load file or assembly 'System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. The system cannot find the file specified.

It works with a Framework 4.7 project with the same Nuget Package System.ServiceModel.Http.4.3.0.

c++sharp.netwcf.net-core


Solution 1:[1]

Microsoft has made available the relevant assemblies as packages on NuGet now.

System.ServiceModel.Primitives is the base package; add the others if necessary to your project.

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Update (April 28th, 2022):

WCF has been partially ported to .NET 5+ with an official library called CoreWCF: https://devblogs.microsoft.com/dotnet/corewcf-v1-released/

Solution 2:[2]

If you are using .NET Standard 2.0 (that's what I tested with), you can install compatible NuGet packages.

The basic service model is available in System.ServiceModel.Primitives (currently v4.4.0).

If required, install System.ServiceModel.Http as well.

Solution 3:[3]

The Microsoft WCF Web Service Reference Provider wraps SvcUtil.exe and will generate a .NET Standard project from your endpoint. Look in the project file and you'll see the ServiceModel references that will work for you.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard1.4</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="System.ServiceModel.Duplex" Version="4.3.0" />
    <PackageReference Include="System.ServiceModel.Http" Version="4.3.0" />
    <PackageReference Include="System.ServiceModel.NetTcp" Version="4.3.0" />
    <PackageReference Include="System.ServiceModel.Security" Version="4.3.0" />
    <PackageReference Include="System.Xml.XmlSerializer" Version="4.3.0" />
  </ItemGroup>
</Project>

When I needed to do this I was able to use the generated class library in my .NET Core project.

Solution 4:[4]

I had same issue, i had to add .asmx web service into my class library asp.net core project, i tried to add reference directly by add connected service option but i wan unable to see any config file and lots of references errors also, below are the steps by which i solve my problem.

1-Create library project name Service Mapping 2-Create folder Web References and then create inside folder ClientHotel 3-Open terminal in visual studio from view ---> terminal --- command prompt. 4-Integrate asmx service by command svcutil http://abctest.asmx (.asmx URL) inside inside ClientHotel folder.

5-it will create .cs class and output.config file with references in it. 6-Now i had errors of references like the type or namespace servicecontractattribute does not exist in namespace System.ServiceModel etc.

7-Install Package System.ServiceModel.Primitives Then all references errors will be gone.

That is how i was able to add .asmx service to my class library project.

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2
Solution 3 CWagner
Solution 4 saqib amin

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