ServiceModel.Grpc.SelfHost

ServiceModel.Grpc enables applications to communicate with gRPC services using a code-first approach (no .proto files), helps to get around limitations of gRPC protocol like "only reference types", "exact one input", "no nulls", "no value-types". Provides exception handling. Helps to migrate existing WCF solution to gRPC with minimum effort.

ServiceModel.Grpc.DesignTime is package with C# code generator for client and server-side assets.

Declare a service contract

A service contract is an interface decorated with the ServiceContract attribute. Interface methods decorated with the OperationContract attribute are treated as gRPC operations.

For example, following ICalculator contract with unary Sum operation and client streaming MultiplyBy operation:

[ServiceContract] public interface ICalculator { [OperationContract] Task<long> Sum(long x, int y, int z, CancellationToken token = default); [OperationContract] ValueTask<(int Multiplier, IAsyncEnumerable<int> Values)> MultiplyBy(IAsyncEnumerable<int> values, int multiplier, CancellationToken token = default); }

Configure code generator for client proxies

For source code generation create a placeholder - a static partial class, name doesn’t matter. Configure which proxies should be generated via ImportGrpcService attribute.

[ImportGrpcService(typeof(ICalculator))] internal static partial class MyGrpcServices { // generated code ... public static IClientFactory AddCalculatorClient(this IClientFactory clientFactory, Action<ServiceModelGrpcClientOptions> configure = null) {} }

Instruct ClientFactory to use a proxy from generated code.

IClientFactory clientFactory = new ClientFactory(); // register generated proxy for ICalculator clientFactory.AddCalculatorClient(); // create an instance ICalculator calculator = clientFactory.CreateClient<ICalculator>(channel);