asp.net mvc core管道及拦截器的理解

今天来看一下asp.net core的执行管道。先看下官方说明：

进入mvc管道后，根据以上顺序执行过滤校正。

OK，根据以上说明下面我们新建一个MVC的演示，将执行方式切换为控台运行：

// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
 services.AddControllersWithViews(config=> 
 {
  Console.WriteLine("execute C");
  //config.Filters.Add(new AsyncAuthorizationFilter());
  config.Filters.Add(new AuthorizationFilter());
  config.Filters.Add(new ResourceFilter());
  //config.Filters.Add(new AsyncResourceFilter());
  config.Filters.Add(new ActionFilter());
  //config.Filters.Add(new AsyncActionFilter());
  config.Filters.Add(new ResultFilter());
  //config.Filters.Add(new AsyncResultFilter());
  config.Filters.Add(new ExceptionFilter());
  //config.Filters.Add(new AsyncExceptionFilter());
  Console.WriteLine("execute D");
 });
 services.AddSession(config=> {
  Console.WriteLine("execute E");
 });
}

// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
 if (env.IsDevelopment())
 {
  app.UseDeveloperExceptionPage();
 }
 else
 {
  app.UseExceptionHandler("/Home/Error");
 }
 app.UseStaticFiles();
 app.UseRouting();
 app.UseAuthorization();
 app.Use(async (context, next) =>
 {
  Console.WriteLine("execute F");
  await context.Response.WriteAsync("hello world");
  Console.WriteLine("execute G");
 });
 //app.UseSession();
 app.UseEndpoints(endpoints =>
 {
  Console.WriteLine("execute A");
  endpoints.MapControllerRoute(
   name: "default",
   pattern: "{controller=Home}/{action=Index}/{id?}");
  Console.WriteLine("execute B");
 });
}

执行结果：

 定义一个异常看下结果：

public IActionResult Privacy()
{
  throw new Exception("error");
}

ok，目标达成，不多说了，下次再看拦截器具体实现。

参考文档：ASP.NET Core 中的筛选器

总结

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