C# Google protoc SSL GrpcServicesClient TodoWorld Example

Program.cs

using System;
using System.Linq;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Net.Client;

namespace TodoWorld
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var client = new GrpcServices.GrpcServicesClient(
                GrpcChannel.ForAddress("https://todoworld.servicestack.net:50051", new GrpcChannelOptions {
                    HttpClient = new System.Net.Http.HttpClient(new System.Net.Http.HttpClientHandler {
                        ClientCertificates = { new X509Certificate2("grpc.crt") },
                        ServerCertificateCustomValidationCallback = (req, cert, certChain, sslErrors) =>
                            cert.SubjectName.RawData.SequenceEqual(cert.IssuerName.RawData) && // self-signed
                            cert.GetNameInfo(X509NameType.DnsName, forIssuer:false) == "todoworld.servicestack.net" &&
                            (sslErrors & ~SslPolicyErrors.RemoteCertificateChainErrors) == SslPolicyErrors.None // only this
                    })
                }));

            var response = await client.GetHelloAsync(new Hello { Name = "gRPC C#" });

            Console.WriteLine(response.Result);
        }
    }
}