ASP.NET Core MVC 2.0 Cookbook

How to do it...

We'll create a new project and write our first middleware. We can observe the execution mechanism of middleware with this project.

1. First, let's create a middleware class:

public class MyMiddleware1 
{ 
  private readonly RequestDelegate _next; 
 
  public MyMiddleware1(RequestDelegate next) 
  { 
    _next = next; 
  } 
 
  public async Task Invoke(HttpContext httpContext) 
  { 
    await httpContext.Response.WriteAsync 
    ("Hello from first middleware before Request n"); 
    await _next(httpContext); 
    await httpContext.Response.WriteAsync 
    ("Hello from first middleware after Request n"); 
  } 
} 

A middleware class does not inherit from any class or interface, but has to respect some rules:

• • Having a public constructor that takes a RequestDelegate type as parameter. ...