Getting Started with .NET Core Microservices

Microservices architecture has become the standard for building scalable, maintainable backend systems. .NET Core provides excellent tooling and performance for building microservices.

Project Setup

Start with the minimal API template in .NET 8. It's lightweight, fast, and perfect for microservices.

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();

var app = builder.Build();

app.MapGet("/api/products", async (ProductService service) =>
    await service.GetAllAsync());

app.Run();

Docker Containerization

Every microservice should be containerized. Here's a production-ready Dockerfile for .NET:

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src
COPY *.csproj .
RUN dotnet restore
COPY . .
RUN dotnet publish -c Release -o /app

FROM mcr.microsoft.com/dotnet/aspnet:8.0
WORKDIR /app
COPY --from=build /app .
ENTRYPOINT ["dotnet", "ProductService.dll"]

Service Communication

For inter-service communication, I recommend using gRPC for synchronous calls and RabbitMQ or Azure Service Bus for asynchronous messaging.

Key Takeaways

- Use minimal APIs for microservices — less ceremony

- Containerize everything from day one

- Choose sync (gRPC) or async (message bus) communication wisely

- Implement health checks for Kubernetes readiness probes