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Owin Middleware如何在IIS集成管道中执行
Owin Middleware Components(OMCs)
通过安装Install-Package Microsoft.Owin.Host.SystemWeb
可以让OMCs在IIS集成管道下工作
在IIS集成管道里，这个request pipeline 包含HttpModules关联到一组预定义的管道事件，例如
BeginRequest, AuthenticateRequest, AuthorizeRequest,等
如果我们将OMC和HttpModule进行比较，OMC也和HttpModule一样,必须要被注册到一个恰当的预定义的管道事件里，比如下面的这个Httpmodule，
当一个请求来到AuthenticateRequest阶段时，MyModule会被调用
public class MyModule : IHttpModule{ public void Dispose() { //clean-up code here. } public void Init(HttpApplication context) { // An example of how you can handle AuthenticateRequest events. context.AuthenticateRequest += ctx_AuthRequest; } void ctx_AuthRequest(object sender, EventArgs e) { // Handle event. }}为了使OMC取参与和HttpModule相同的基于事件的执行顺序，Katana运行时代码扫描Startup配置，并且把每个OMC关联到某个集成管道事件里，
比如下面的配置：
using System;using System.Threading.Tasks;using Microsoft.Owin;using Owin;using System.Web;using System.IO;using Microsoft.Owin.Extensions;[assembly: OwinStartup(typeof(owin2.Startup))]namespace owin2{ public class Startup { public void Configuration(IAppBuilder app) { app.Use((context, next) => { PrintCurrentIntegratedPipelineStage(context, "Middleware 1"); return next.Invoke(); }); app.Use((context, next) => { PrintCurrentIntegratedPipelineStage(context, "2nd MW"); return next.Invoke(); }); app.Run(context => { PrintCurrentIntegratedPipelineStage(context, "3rd MW"); return context.Response.WriteAsync("Hello world"); }); } private void PrintCurrentIntegratedPipelineStage(IOwinContext context, string msg) { var currentIntegratedpipelineStage = HttpContext.Current.CurrentNotification; context.Get<TextWriter>("host.TraceOutput").WriteLine( "Current IIS event: " + currentIntegratedpipelineStage + " Msg: " + msg); } }}输出如下：
Current IIS event: PreExecuteRequestHandler Msg: Middleware 1Current IIS event: PreExecuteRequestHandler Msg: 2nd MWCurrent IIS event: PreExecuteRequestHandler Msg: 3rd MW
可以看到Katana运行时默认映射每个OMC到IIS管道事件PreRequestHandlerExecute
你可以根据需要调整这个OMC和管道事件的这种默认关系，具体使用一个扩展方法IAppBuilder UseStageMarker()，
像下面这样：
public void Configuration(IAppBuilder app){ app.Use((context, next) => { PrintCurrentIntegratedPipelineStage(context, "Middleware 1"); return next.Invoke(); }); app.Use((context, next) => { PrintCurrentIntegratedPipelineStage(context, "2nd MW"); return next.Invoke(); }); app.UseStageMarker(PipelineStage.Authenticate); app.Run(context => { PrintCurrentIntegratedPipelineStage(context, "3rd MW"); return context.Response.WriteAsync("Hello world"); }); app.UseStageMarker(PipelineStage.ResolveCache);}输出如下：
Current IIS event: AuthenticateRequest Msg: Middleware 1Current IIS event: AuthenticateRequest Msg: 2nd MWCurrent IIS event: ResolveRequestCache Msg: 3rd MW
https://docs.microsoft.com/en-us/aspnet/aspnet/overview/owin-and-katana/owin-middleware-in-the-iis-integrated-pipeline
Owin Middleware如何在IIS集成管道中执行
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