syntax = "proto3";

package helloworld;

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply) {}
}

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

Google.Protobuf
grpc
Grpc.Tools

<ItemGroup>
      <Protobuf Include="helloworld.proto" />
  </ItemGroup>

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Helloworld;
using Grpc.Core;

namespace ServerGrpc
{
    class GreeterImpl : Greeter.GreeterBase
    {
        public override Task<HelloReply> SayHello(HelloRequest request, ServerCallContext context)
        {
            System.Console.WriteLine("request made!");
            return Task.FromResult(new HelloReply { Message = "Hello " + request.Name });
        }
    }

    class Program
    {
       const int Port = 50051;

        public static void Main(string[] args)
        {
            Server server = new Server
            {
                Services = { Greeter.BindService(new GreeterImpl()) },
                Ports = { new ServerPort("localhost", Port, ServerCredentials.Insecure) }
            };
            server.Start();

            Console.WriteLine("Greeter server listening on port " + Port);
            Console.WriteLine("Press any key to stop the server...");
            Console.ReadKey();

            server.ShutdownAsync().Wait();
        }
    }
}

obj/Debug/netcoreapp2.2(یا نسخه‌ی دیگری که استفاده میکنید)

protoc helloworld.proto --go_out=plugins=grpc:.