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C# Academy · Lesson

gRPC & Protobuf Fundamentals

Define service contracts in .proto files, generate C# code with Grpc.Tools, and understand gRPC transport.

What Is gRPC?

gRPC is a high-performance, language-agnostic RPC framework developed by Google. It uses HTTP/2 for transport and Protocol Buffers (Protobuf) as the serialization format — much faster and more compact than JSON over HTTP/1.1.

Protocol Buffers: The IDL

You define your service contract in a .proto file. Protobuf IDL (Interface Definition Language) is strongly typed and language-neutral — the same file generates client/server code in C#, Go, Python, etc.

// greet.proto
syntax = "proto3";

option csharp_namespace = "GrpcService";

package greet;

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

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

All lessons in this course

  1. gRPC & Protobuf Fundamentals
  2. Unary & Server Streaming RPCs
  3. Client & Bidirectional Streaming
  4. Deadlines, Cancellation & Interceptors
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