Project Orleans Cannot find grain implementation

Question

I have a solution in .NET 7 version. I am using Orleans 7.0.2 version in this solution.

I have 3 projects in my solution named Contracts, Grains and ConsoleApp.

I have IStock.cs interface in my Contracts project:

public interface IStock : IGrainWithIntegerKey
{
    Task<int> Get();
}

In my Grains project, I have the StockGrain.cs class and it uses the IStock.cs interface:

public class StockGrain : Grain, IStock
{
    public Task<int> Get()
    {
        return Task.FromResult(10);
    }
}

ConsoleApp project references 2 other projects. I am using the sample code as below in the Program.cs file:

var host = Host.CreateDefaultBuilder(args)
    .UseOrleans(builder =>
    {
        builder.UseLocalhostClustering();
    }).Build();

await host.StartAsync();

var client = host.Services.GetRequiredService<IGrainFactory>();
var grain = client.GetGrain<IStock>(1);

await host.StopAsync();

When I run ConsoleApp I get the following error:

Unhandled exception. System.ArgumentException: Could not find an implementation for interface Contracts.IStock
   at Orleans.GrainInterfaceTypeToGrainTypeResolver.GetGrainType(GrainInterfaceType interfaceType)

In Orleans 7 version, the Grain class I implemented cannot be found.

Answer 1

Install Microsoft.Orleans.Sdk into your Contracts and Grains projects. Without it code generation doesn't work.