Using Code-First gRPC on .NET

The standard way of writing gRPC services is to manually write Protobuf files and then write their implementation in code. The main disadvantage of this process is that it's time-consuming. However, there's a way to write gRPC services without manually writing Protobuf definitions. It's called the code-first approach.

When we apply the code-first approach, all of our code is written in C#. We need to apply appropriate annotations to our classes. All the necessary gRPC components will be automatically generated for us once we compile our application. To learn how to use this approach, we'll apply some changes to the following setup.