1. gRPC is an open source RPC framework developed at Google in 2015 that provides high performance communication between services. It uses protocol buffers for serialization and HTTP/2 for transport. 2. gRPC supports .NET Core since version 3.0 and can replace WCF in the .NET ecosystem. It uses protocol buffers definitions to define service contracts and message types in a language-neutral way. 3. gRPC is well suited for microservices, real-time communication, multi-language environments, and network-constrained scenarios due to its high performance, interoperability and streaming capabilities. It has become a popular RPC framework for building distributed systems.

1. gRPC says Hi to
.NET
Yu-Lang Chu

2. .NET Developer from APIs to APIs
WCFRest OData
gRPCRest GraphQL
.NET 4.X
.NET 5

3. gRPC in .NET
● Developed at Google in 2015
● CNCF project
● Official support .NET core 3.0
● Replace WCF in .NET ecosystem

4. What is gRPC:
General-purpose Remote Procedure Calls

5. Latest new technologies
C# Service
gRPC Server
JS Client
gRPC Client
stub
Python Client
gRPC Client
stub
HTTP/2
Protobuf

6. Interoperability

7. Rest API vs gRPC
● Resource/Content first - JSON
● Human Readable content - JSON
● Text serialization - JSON
● HTTP verbs
● Contract first - protobuf
● Human Readable contract - protobuf
● Binary serialization - protobuf
● No limitation to verbs
https://martin.kleppmann.com/2012/12/05/schema-evolution-in-avro-protocol-buffers-thrift.html

8. Performance: Protobuf vs XML vs JSON
https://digitallife.rocks/2019/05/30/how-to-save-money-with-technology-protobuf/

9. Protobuf : core of gRPC
GeneratorProtobuf
C# class
Python class
Golang struct
Message

10. Protobuf vs WCF
https://docs.microsoft.com/en-us/dotnet/architecture/grpc-for-wcf-developers/migrate-request-reply

11. Definition of Protobuf
Syntax version
options
package(protobuf)
Service definition
Message

12. Types of method: WCF vs gRPC
https://docs.microsoft.com/en-us/dotnet/architecture/grpc-for-wcf-developers/rpc-types

13. 4 type of service method
client server
client server
client server
client server
Unary
Client Streaming
Server Streaming
Bidirectional
Streaming

14. Scenarios
Feature: low latency, high throughput, stream, cross-platform
4 recommended scenarios:
● Microservice
● Point-to-point real time communication
● Multi-language environments
● Network constrained environments

15. Demo: how to start GRPC project

16. How to create gRPC server project
● VS2019:
● Command line : dotnet new grpc
● Existing project:
○ add package Grpc.AspNetCore
○ Startup.cs: Add gRPC services and endpoint

17. How to create gRPC Client project
Project setup:
1. Install Packages:
● Google.Protobuf
● Grpc.Net.Client
● Grpc.Tools
2. Add Protobuf files reference into .csproj, then build project
Code:
3. Setup channel: var channel = Grpc.channel.ForAddress(...);
4. Call defined API

18. More Topics
● Protobuf definition
● Authentication/Authorization
● Cache
● Rate limiting
● GRPC web
● ….. etc

19. Reference
● https://developers.google.com/protocol-buffers
● https://docs.microsoft.com/en-us/dotnet/architecture/grpc-for-wcf-developers/
● https://grpc.io/
● https://github.com/grpc/grpc-dotnet