本文共 8514 字，大约阅读时间需要 28 分钟。

1.基本中间件的使用

public static void Start(){
       var host = Host.CreateDefaultBuilder()        .ConfigureWebHost(builder => builder            .UseKestrel()            .Configure(app =>                 app.Run(context =>                     context.Response.WriteAsync("Hello!"))            )        ).Build();    host.Run();}

public static class Sample02{
       public static void Start()    {
           var host = Host.CreateDefaultBuilder()            .ConfigureWebHostDefaults(builder => builder                .Configure(app => app                    .Use(Middleware1)                    .Use(Middleware2)                )            ).Build();        host.Run();    }    private static RequestDelegate Middleware1(RequestDelegate next)    {
           async Task App(HttpContext context)        {
               await context.Response.WriteAsync("Middleware 1 Begin.");            await next(context);            await context.Response.WriteAsync("Middleware 1 End.");        }        return App;    }    private static RequestDelegate Middleware2(RequestDelegate next)    {
           async Task App(HttpContext context)        {
               await context.Response.WriteAsync("Middleware 2 Begin.");        }        return App;    }}

2.强类型中间件的使用

public class Sample03{
       public class HelloMiddleware : IMiddleware    {
           public async Task InvokeAsync(HttpContext context, RequestDelegate next)        {
               await context.Response.WriteAsync("Hello");        }    }    public static void Start()    {
           var host = Host.CreateDefaultBuilder()            .ConfigureWebHostDefaults(builder => builder                .ConfigureServices(collection => collection.AddSingleton
   
    ())                .Configure(app => app                    .UseMiddleware
    
     ()                )            ).Build();        host.Run();    }}
    
   

3.约定中间件的使用

public class Sample04{
       public class HelloMiddleware    {
           private readonly RequestDelegate _next;        private readonly string _content;        private readonly bool _isToNext;        public HelloMiddleware(RequestDelegate next, string content, bool isToNext = false)        {
               _next = next;            _content = content;            _isToNext = isToNext;        }        public async Task InvokeAsync(HttpContext httpContext)        {
               await httpContext.Response.WriteAsync($"Hello {_content}!\r\n");            if (_isToNext) await _next(httpContext);        }    }    public static void Start()    {
           var host = Host.CreateDefaultBuilder()            .ConfigureWebHostDefaults(builder => builder                .Configure(app => app                    .UseMiddleware
   
    ("Rick", true)                    .UseMiddleware
    
     ("Motry")                )            ).Build();        host.Run();    }}
    
   

4.Startup的由来和使用

public static class Sample06    {
           public class Startup        {
               public void ConfigureServices(IServiceCollection services)            {
                   foreach (var service in services)                {
                       var serviceName = service.ServiceType.Name;                    var implType = service.ImplementationType;                    if (implType != null)                    {
                           Console.WriteLine($"{service.Lifetime, -15}{serviceName,-40}{implType.Name}");                    }                }            }            public void Configure(IApplicationBuilder app)            {
               }        }        public static void Start()        {
               var host = Host.CreateDefaultBuilder()                .ConfigureWebHostDefaults(builder => builder                    .UseStartup
   
    ())                .Build();                        host.Run();        }    }
   

public class Sample07    {
           public class Startup        {
               public Startup(IConfiguration configuration, IHostEnvironment hostingEnvironment)            {
                   Debug.Assert(configuration != null);                Debug.Assert(hostingEnvironment != null);            }            public void ConfigureServices(IServiceCollection services)            {
               }            public void Configure(IApplicationBuilder app)            {
               }        }        public static void Start()        {
               var host = Host.CreateDefaultBuilder()                .ConfigureWebHostDefaults(builder => builder                    .UseStartup
   
    ())                .Build();                        host.Run();        }    }
   

public class Sample09    {
           public class Test1{
    };        public class Test2{
    };        public class TestMiddleware        {
               private readonly RequestDelegate _next;            public TestMiddleware(RequestDelegate next, Test1 test1, Test2 test2)            {
                   Debug.Assert(test1 != null);                Debug.Assert(test2 != null);                _next = next;            }            public async Task InvokeAsync(HttpContext httpContext)            {
                   Debug.Assert(_next != null);                await httpContext.Response.WriteAsync("Test");            }        }        public class Startup        {
               public void ConfigureServices(IServiceCollection services)            {
                   services                    .AddSingleton
   
    ()                    .AddSingleton
    
     ();            }            public void Configure(IApplicationBuilder app)            {
                   app.UseMiddleware
     
      ();            }        }        public static void Start()        {
               var host = Host.CreateDefaultBuilder()                .ConfigureWebHostDefaults(builder => builder                    .UseStartup
      
       ())                .Build();                        host.Run();        }    }
      
     
    
   

public class Sample10    {
           public class Test1{
    };        public class Test2{
    };        public class TestMiddleware        {
               private readonly RequestDelegate _next;            public TestMiddleware(RequestDelegate next)            {
                                   _next = next;            }            public async Task InvokeAsync(HttpContext httpContext,Test1 test1, Test2 test2)            {
                   Debug.Assert(test1 != null);                Debug.Assert(test2 != null);                await httpContext.Response.WriteAsync("Test");            }        }        public class Startup        {
               public void ConfigureServices(IServiceCollection services)            {
                   services                    .AddSingleton
   
    ()                    .AddSingleton
    
     ();            }            public void Configure(IApplicationBuilder app)            {
                   app.UseMiddleware
     
      ();            }        }        public static void Start()        {
               var host = Host.CreateDefaultBuilder()                .ConfigureWebHostDefaults(builder => builder                    .UseStartup
      
       ())                .Build();                        host.Run();        }    }
      
     
    
   

public class Sample11    {
           public class Test1{
    }        public class Test2{
    }               public static void Start()        {
               var host = Host.CreateDefaultBuilder()                .ConfigureWebHostDefaults(builder => builder                    .ConfigureServices(collection => collection                        .AddSingleton
   
    ()                        .AddSingleton
    
     ()                        .AddControllersWithViews())                    .Configure(app=>app                        .UseRouting()                        .UseEndpoints(routeBuilder => routeBuilder.MapControllers()))                )                .Build();                        host.Run();        }    }    public class Startup    {
           public void Configure(IApplicationBuilder app)        {
           }        public void ConfigureServices(IServiceCollection services)        {
           }    }    public class HomeController : Controller    {
           private readonly Sample11.Test1 _test1;        public HomeController(Sample11.Test1 test1)        {
               _test1 = test1;        }        [HttpGet("/")]        public IActionResult Index()        {
               ViewBag.Test1 = _test1;            return View();        }    }
    
   

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