MemoryPack.MemoryPackSerializationException : <class> is not registered in this provider

[g3rzi]

There was already issue about that:
https://github.com/Cysharp/MemoryPack/issues/119

The solution was to go to the csproj file and change from MemoryPack to MemoryPack.Core.
Unfortunately, my csproj has only MemoryPack and it still doesn't work, this is why I opened a new case.

I installed MemoryPack from the documentation:

NuGet\Install-Package MemoryPack -Version 1.9.16

Also Roslyn:

NuGet\Install-Package Microsoft.Net.Compilers -Version 4.2.0

I have Visual Studio 2022 17.7.3, I am using the example from the documentation:

using MemoryPack;

namespace ConsoleApp1
{
    [MemoryPackable]
    public partial class Person
    {
        public int Age { get; set; }
        public string Name { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello, World!");
            var v = new Person { Age = 40, Name = "John" };
            var bin = MemoryPackSerializer.Serialize(v);
            var val = MemoryPackSerializer.Deserialize<Person>(bin);
            Console.WriteLine(val);
        }
    }
}

And I am getting the same error:

Hello, World!
Unhandled exception. MemoryPack.MemoryPackSerializationException: ConsoleApp1.Person is not registered in this provider.
   at MemoryPack.MemoryPackSerializationException.ThrowNotRegisteredInProvider(Type type)
   at MemoryPack.ErrorMemoryPackFormatter`1.Throw()
   at MemoryPack.ErrorMemoryPackFormatter`1.Serialize[TBufferWriter](MemoryPackWriter`1& writer, T& value)
   at MemoryPack.MemoryPackSerializer.Serialize[T](T& value, MemoryPackSerializerOptions options)
   at ConsoleApp1.Program.Main(String[] args) in C:\Users\myuser\source\repos\MemoryPackConsole1\MemoryPackConsole1\Program.cs:line 27

My csproject file:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="MemoryPack" Version="1.9.16" />
    <PackageReference Include="Microsoft.Net.Compilers" Version="4.2.0">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

</Project>

I saw that in the exception that it still uses the MemoryPack.core:

Also here:

Here the code generated:

[shishiraltysys]

Hello there,

Have you discovered any answers to this problem? This is the bottleneck for us, and we need a solution. Could you please make this a priority?

Thanks in advance.

[g3rzi]

Unfortunately, I haven't found it yet, I hope the owner @neuecc will help us because this issue is not solved.

[shishiraltysys]

Hello @neuecc,

Could you please help us.

[neuecc]

Can you remove Microsoft.Net.Compilers ? It hookss special compiling process, it harms the generator.

[neuecc]

If you want to use Microsoft.Net.Compilers, It seems to work with <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="4.8.0-2.final">.

[shishiraltysys]

Hello @neuecc

Thanks for your response, but i haven't used Microsoft.Net.Compilers in my application. I have used below dependencies.

[neuecc]

It seems that the situation with g3rzi is different. Please provide more details about your situation (csproj, Version of IDE (Visual Studio), generated code).

[g3rzi]

@neuecc thank you, it works!

after going to Packages and removing the Microsoft.Net.Compilers it worked:

Also, the second solution to edit the MemoryPackConsole1.csproj file works too:

<Project Sdk="Microsoft.NET.Sdk">

    <PropertyGroup>
        <OutputType>Exe</OutputType>
        <TargetFramework>net7.0</TargetFramework>
        <ImplicitUsings>enable</ImplicitUsings>
        <Nullable>enable</Nullable>
    </PropertyGroup>

    <ItemGroup>
      <PackageReference Include="MemoryPack" Version="1.9.16" />
        <PackageReference Include="Microsoft.Net.Compilers.Toolset" Version="4.8.0-2.final">
        <PrivateAssets>all</PrivateAssets>
        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      </PackageReference>
    </ItemGroup>

</Project>