最近一直没搞懂在 mvc5框架中 为什么存在 Global.asax.cs和Startup.cs 文件...
然后搜索下面文章：
http://stackoverflow.com/questions/20168978/do-i-need-a-global-asax-cs-file-at-all-if-im-using-an-owin-startup-cs-class-and
其中提到
1、Application_Start 会比Startup.Configuration 先启动
2、mvc4 版本一致性 布啦布啦....
3、 Global.asax.cs 可以处理一些特殊事件 例如 Application_Start Application_Error Session_Start 等等
4、Startup.Configuration 中可以配置 关于授权之类的(替代原先的Application_AuthenticateRequest，另外mvc5中引入了ASP.NET Identity 2,而这个基于Owin)
5、最最重要的一条如果 引用集没有Microsoft.Owin.Host.SystemWeb 这个dll 便不会加载Startup.Configuration
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ok 进入另一个话题 owin 的管道有什么 首先贴下微软的PipelineStage
1 namespace Owin
2 {
3 /// <summary>
4 /// An ordered list of known Asp.Net integrated pipeline stages. More details on the ASP.NET integrated pipeline can be found at http://msdn.microsoft.com/en-us/library/system.web.httpapplication.aspx
5 ///
6 /// </summary>
7 public enum PipelineStage
8 {
9 Authenticate,
10 PostAuthenticate,
11 Authorize,
12 PostAuthorize,
13 ResolveCache,
14 PostResolveCache,
15 MapHandler,
16 PostMapHandler,
17 AcquireState,
18 PostAcquireState,
19 PreHandlerExecute,
20 }
21 }
看注释 去看 httpapplication事件。。。个人感觉Owin管道里的事件是可以替代原先的httpapplication事件的。。。
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既然说到Startup.Configuration可以替代 那怎么用才是关键，直接上代码：
1 public void Configuration(IAppBuilder app)
2 {
3 app.Use((context, next) =>
4 {
5 PrintCurrentIntegratedPipelineStage(context, "Middleware 1");
6 return next.Invoke();
7 });
8 app.Use((context, next) =>
9 {
10 PrintCurrentIntegratedPipelineStage(context, "2nd MW");
11 return next.Invoke();
12 });
13 app.UseStageMarker(PipelineStage.Authenticate);
14 app.Run(context =>
15 {
16 PrintCurrentIntegratedPipelineStage(context, "3rd MW");
17 return context.Response.WriteAsync("Hello world");
18 });
19 app.UseStageMarker(PipelineStage.ResolveCache);
20 }
看代码中红色部分。。。 使用app.UseStageMarker(xxxx状态)之前的代码 便是xxxx状态注册。
注意：
1、如果不是用UseStageMarker标记 那些中间件的位置 所有的位置为：PreHandlerExecute。
2、多次使用UseStageMarker 不能 前面顺序比后面大。。。
相关链接：http://www.asp.net/aspnet/overview/owin-and-katana/owin-middleware-in-the-iis-integrated-pipeline
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个人一些闲言碎语
貌似 asp.net5 里 mvc框架 中没有了Global.asax.cs文件 入口就是Startup.cs
还有 个人感觉 IOwinConent 会替代 HttpAplication ；OwinMiddleware 替代IHttpModule ( 当然这是指 asp.net5里，而mvc5中还是 混搭风格),app.Use(xxxxxx)构成的 管道还是 相对好理解的
不过现在asp.net 还是 rc等出了 rtm再来更新吧。。。。
贴下 asp.net5中Startup
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Threading.Tasks;
5 using Microsoft.AspNet.Builder;
6 using Microsoft.AspNet.Hosting;
7 using Microsoft.AspNet.Identity.EntityFramework;
8 using Microsoft.Data.Entity;
9 using Microsoft.Extensions.Configuration;
10 using Microsoft.Extensions.DependencyInjection;
11 using Microsoft.Extensions.Logging;
12 using WebApplication2.Models;
13 using WebApplication2.Services;
14
15 namespace WebApplication2
16 {
17 public class Startup
18 {
19 public Startup(IHostingEnvironment env)
20 {
21 // Set up configuration sources.
22 var builder = new ConfigurationBuilder()
23 .AddJsonFile("appsettings.json")
24 .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);
25
26 if (env.IsDevelopment())
27 {
28 // For more details on using the user secret store see http://go.microsoft.com/fwlink/?LinkID=532709
29 builder.AddUserSecrets();
30 }
31
32 builder.AddEnvironmentVariables();
33 Configuration = builder.Build();
34 }
35
36 public IConfigurationRoot Configuration { get; set; }
37
38 // This method gets called by the runtime. Use this method to add services to the container.
39 public void ConfigureServices(IServiceCollection services)
40 {
41 // Add framework services.
42 services.AddEntityFramework()
43 .AddSqlServer()
44 .AddDbContext<ApplicationDbContext>(options =>
45 options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"]));
46
47 services.AddIdentity<ApplicationUser, IdentityRole>()
48 .AddEntityFrameworkStores<ApplicationDbContext>()
49 .AddDefaultTokenProviders();
50
51 services.AddMvc();
52
53 // Add application services.
54 services.AddTransient<IEmailSender, AuthMessageSender>();
55 services.AddTransient<ISmsSender, AuthMessageSender>();
56 }
57
58 // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
59 public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
60 {
61 loggerFactory.AddConsole(Configuration.GetSection("Logging"));
62 loggerFactory.AddDebug();
63
64 if (env.IsDevelopment())
65 {
66 app.UseBrowserLink();
67 app.UseDeveloperExceptionPage();
68 app.UseDatabaseErrorPage();
69 }
70 else
71 {
72 app.UseExceptionHandler("/Home/Error");
73
74 // For more details on creating database during deployment see http://go.microsoft.com/fwlink/?LinkID=615859
75 try
76 {
77 using (var serviceScope = app.ApplicationServices.GetRequiredService<IServiceScopeFactory>()
78 .CreateScope())
79 {
80 serviceScope.ServiceProvider.GetService<ApplicationDbContext>()
81 .Database.Migrate();
82 }
83 }
84 catch { }
85 }
86
87 app.UseIISPlatformHandler(options => options.AuthenticationDescriptions.Clear());
88
89 app.UseStaticFiles();
90
91 app.UseIdentity();
92
93 // To configure external authentication please see http://go.microsoft.com/fwlink/?LinkID=532715
94
95 app.UseMvc(routes =>
96 {
97 routes.MapRoute(
98 name: "default",
99 template: "{controller=Home}/{action=Index}/{id?}");
100 });
101 }
102
103 // Entry point for the application.
104 public static void Main(string[] args) => WebApplication.Run<Startup>(args);
105 }
106 }