gRPC in .NET Core 3.0: High-Performance RPC

gRPC is now a first-class citizen in .NET Core 3.0. It’s faster than REST for internal service communication. Here’s how to get started.

Define the Service

syntax = "proto3";

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

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

Implement the Service

public class GreeterService : Greeter.GreeterBase
{
    public override Task<HelloReply> SayHello(
        HelloRequest request, ServerCallContext context)
    {
        return Task.FromResult(new HelloReply
        {
            Message = $"Hello, {request.Name}!"
        });
    }
}

Client

var channel = GrpcChannel.ForAddress("https://localhost:5001");
var client = new Greeter.GreeterClient(channel);
var reply = await client.SayHelloAsync(new HelloRequest { Name = "World" });

When to Use gRPC

• Service-to-service communication
• Streaming scenarios
• Performance-critical paths

References

• gRPC in ASP.NET Core