SOLID & Design Patterns Interview Question #97
How do ASP.NET Core middleware and Chain of Responsibility relate?
DDD Boundaries, Resilience, Caching & Practical ASP.NET Core Design Mid-Level Intermediate
Quick Interview Answer
ASP.NET Core middleware forms an ordered request pipeline in which each component can process the request and optionally invoke the next component. This closely resembles the Chain of Responsibility pattern.
Detailed Explanation
ASP.NET Core middleware forms an ordered request pipeline in which each component can process the request and optionally invoke the next component. This closely resembles the Chain of Responsibility pattern.
Middleware can execute logic before and after the next delegate or short-circuit the pipeline entirely. Ordering matters because authentication, authorization, routing, exception handling, and other components depend on their position.
Code Example
app.UseExceptionHandler("/Home/Error");
app.UseHttpsRedirection();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllers();