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Event-Driven Architecture in C#: Build Loosely Coupled Apps

Learn event-driven architecture in C# with runnable examples: C# events, MediatR, and message queues. Build loosely coupled .NET systems today. Event-driven architecture in C# is one of the most effective ways to build systems that are easy to extend, test, and scale. Instead of one class calling another directly, components announce that something happened and let any interested party react. The result is loosely coupled code: the order service does not need to know that an email service, an inventory service, and an analytics pipeline all care about a new order. In this tutorial you will learn event-driven architecture in C# from the ground up: plain event keywords, in-process domain events with MediatR, and message-broker-based integration events for distributed .NET systems, with runnable code and the pitfalls to avoid. What Is Event-Driven Architecture in C#? An event is an immutable record of something that already happened: OrderPlaced , PaymentFailed , UserRegistered ....