今天来看一下asp.net core的执行管道。先看下官方说明：
从上图可以抛光，asp.net core的执行顺序是，当收到一个请求后，request请求会先经过已注册的中间件，然后会进入到mvc的拦截器管道：
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：
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// 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：
不多做解释，从从这里我们可以抛光符合官方说明文档。
看完中间件执行顺序，下面我们来了解下mvc拦截器的使用与执行顺序。
根据mvc filter管道执行顺序，我们分别来看下用法：
1）AuthorizationFilter：该拦截器是优先级最高的，当请求进入mvc后，首先会被AuthorizationFilter验证是否有权限访问，无权限则跳出。
同步用法：
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public class AuthorizationFilter: IAuthorizationFilter{ public void OnAuthorization(AuthorizationFilterContext context) { context.HttpContext.Response.WriteAsync("authorization filter \r"); }} |
异步用法：
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public class AsyncAuthorizationFilter: IAsyncAuthorizationFilter{ public async Task OnAuthorizationAsync(AuthorizationFilterContext context) { await context.HttpContext.Response.WriteAsync($"async authorization filter in \r"); }} |
2）ResourceFilter：该拦截器是作为第二道拦截器，
OnResourceExecuting在模型绑定之前运行代码。OnResourceExecuted在管道的其余阶段完成之后运行代码。
同步用法：
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public class ResourceFilter: IResourceFilter{ public void OnResourceExecuting(ResourceExecutingContext context) { context.HttpContext.Response.WriteAsync($"resource executing\r"); } public void OnResourceExecuted(ResourceExecutedContext context) { context.HttpContext.Response.WriteAsync($"resource executed \r"); }} |
异步用法：
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public class AsyncResourceFilter: IAsyncResourceFilter{ public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next) { await context.HttpContext.Response.WriteAsync($" async resource filter in. \r\n"); await next(); await context.HttpContext.Response.WriteAsync($"async resource filter out. \r\n"); }} |
3）ActionFilter：在调用操作方法之前和之后立即运行代码；可以更改传递到操作中的参数；可以更改从操作返回的结果。
同步用法：
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public class ActionFilter: IActionFilter{ public void OnActionExecuting(ActionExecutingContext context) { context.HttpContext.Response.WriteAsync($"action executing \r"); } public void OnActionExecuted(ActionExecutedContext context) { context.HttpContext.Response.WriteAsync($"action executed . \r"); }} |
异步用法：
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public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next){ await context.HttpContext.Response.WriteAsync($"async action execution in. \r\n"); await next(); await context.HttpContext.Response.WriteAsync($"async action execution out. \r\n");} |
4）OnException：在向响应正文写入任何内容之前，对声明处理的异常应用变量策略。
同步用法：
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public class ExceptionFilter: IExceptionFilter{ public void OnException(ExceptionContext context) { context.HttpContext.Response.WriteAsync($"exception \r"); }} |
异步用法：
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public class AsyncExceptionFilter: IAsyncExceptionFilter{ public Task OnExceptionAsync(ExceptionContext context) { context.HttpContext.Response.WriteAsync($"exception async \r"); return Task.CompletedTask; }} |
5）ResultFilter：在执行操作结果之前和之后立即运行代码；仅当操作方法成功执行时，其才会运行。 可以设置格式化返回结果：
同步操作：
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public class ResultFilter: IResultFilter{ public void OnResultExecuting(ResultExecutingContext context) { context.HttpContext.Response.WriteAsync($"result executing\r"); } public void OnResultExecuted(ResultExecutedContext context) { context.HttpContext.Response.WriteAsync($"result executed \r"); }} |
异步用法：
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public class AsyncResultFilter: IAsyncResultFilter{ public async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next) { await context.HttpContext.Response.WriteAsync($"result execution async in \r"); await next(); await context.HttpContext.Response.WriteAsync($"result execution async out. \r"); }} |
注册方式我们就是用分区注册，已经在上面说明，不再多做表述，下面我们看下运行情况（页面输出）：
定义一个异常看下结果：
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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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原文链接：https://www.cnblogs.com/xtt321/p/12467142.html
