. NET Core 2.0 MVC initial Learning

Mvc_study

Studystartup

Using system;using system.collections.generic;using system.diagnostics;using system.linq;using System.threading.tasks;using microsoft.aspnetcore.builder;using microsoft.aspnetcore.hosting;using Microsoft.aspnetcore.http;using microsoft.extensions.configuration;using Microsoft.extensions.dependencyinjection;using microsoft.extensions.logging;using Web.Study.ConfigModel;using Web.study.monsterinterface;namespace web.study.inhertstartup{public class Studystartup {protected Iconfigur        ation Configuration {get; set;}        Public Studystartup () {}//<summary>//For obtaining configuration information///</summary>            <param name= "Configuration" ></param> public studystartup (iconfiguration configuration) {        Configuration = Configuration; } public IServiceProvider configureservices (iservicecollection services) {//inject MVC Ser Vices.            Addmvc ();          Add options  Services.            AddOptions (); Gets the configuration information services.            Configure<appsetting> (Configuration.getsection (nameof (appsetting))); Turn on session feature services. Addsession (Options ={options.            IdleTimeout = Timespan.fromminutes (30);            }); Constructs a default ServiceProvider processing object return services.        Buildserviceprovider (); } public void Configure (Iapplicationbuilder app, ihostingenvironment Environment, Iloggerfact            Ory loggerfactory, Ihttpcontextfactory httpcontextfactory, Diagnosticsource Diagnosticsource, Diagnosticlistener diagnosticlistener) {//The current environment is the development environment if (environment. Isdevelopment ()) {app.                Usebrowserlink (); App.            Usedeveloperexceptionpage (); } else {app.            Useexceptionhandler ("/home/error"); }//IMPORTANT: The registration of the session must precede USEMVC, because MVCUse the app inside.            Usesession (); Use the static file app in Webroot.            Usestaticfiles (); App. USEMVC (routes = {routes.            MapRoute (name: "Default", Template: "{controller=home}/{action=index}/{id}");        }); }    }}

Program

    public static IWebHost BuildWebHost<T>(string[] args) where T:class     {        IWebHostBuilder webHostBuilder = WebHost.CreateDefaultBuilder(args);        IWebHostBuilder hostBuilder = webHostBuilder.UseStartup<T>();        IWebHost webHost = hostBuilder.Build();        return webHost;    }

Code explain

Construction

Public Studystartup (iconfiguration configuration) Related source Iwebhostbuilder Webhostbuilder = Webhost.createdefaultbuilder ( args); method parsing public static Iwebhostbuilder Createdefaultbuilder (string[] args) {return new Webhostbuilder ().      Usekestrel ()//specify Kestrel as the server to being used by the web host. . Usecontentroot (Directory.GetCurrentDirectory ())//Use the current directory as content and directory//configuration information processing. Configureappconfiguration ((Action<webhostbuildercontext, iconfigurationbuilder>) ((hostingContext, config) =              > {//Inject operating environment ihostingenvironment hostingenvironment = hostingcontext.hostingenvironment; Load configuration file CONFIG. Addjsonfile ("Appsettings.json", True, true). Addjsonfile (String. Format ("appsettings.{          0}.json ", (object) hostingenvironment.environmentname), True, true); Load the appropriate file according to the running environment if (hostingenvironment.isdevelopment ()) {Assembly Assembly = ASSEMBLY.L Oad (New AssemblyName (Hostingenvironment.applicationname)); if (assembly! = (assembly) null) CONFIG.            Addusersecrets (assembly, true); } config.            Addenvironmentvariables ();            if (args = = null) return; Config.      Addcommandline (args); }))//configuration log information. Configurelogging ((Action<webhostbuildercontext, iloggingbuilder>) ((hostingcontext, logging) = {log Ging.        Addconfiguration ((iconfiguration) hostingContext.Configuration.GetSection ("Logging")); Logging.        Addconsole (); Logging.      Adddebug (); }))      . Useiisintegration ()//Publish with IIS. Usedefaultserviceprovider (Action<webhostbuildercontext, serviceprovideroptions>) (context, options) = Options. Validatescopes = context. Hostingenvironment.isdevelopment ()));//using the default processing mechanism}

Even if need to use the parameter construction of startup, you need to configure the corresponding processing class in Configureappconfiguration

Request direction:

Initial: Run---configureservices-Configure

Configuration information is obtained:

<Controller>protected AppSetting ConfigInfo { get; set; }    //读取配置信息protected BaseController(IOptions<AppSetting> options) => ConfigInfo = options.Value;

DI injection

1. The Created DI injection is processed at configureservices

注入方式：services.AddSingleton(u => new MonsterDIController(new GuestDal()));//指定控制器进行注入services.AddSingleton<IDal,DefaultDal>();//统一注入  全局共享一个services.AddTransient<IDal, DefaultDal>();//统一注入    每次使用都不一样，不同的类或不同的方法使用都不一样services.AddScoped<IDal, EmptyDal>();//统一注入   一次请求共享一个对象注：    当对同一类型构造传入不同类型对象的注入时，    不考虑注入类型或范围    已最终注入类型为传入对象创建实例例如:    <Controller>        protected IDal Dal { get; set; }        public MonsterDIController(IDal dal)        {            this.Dal = dal;        }    <ConfigureServices>        如上述一致    <Result>        最终创建实例时，会传入EmptyDal

To turn on the session function:

<method --> ConfigureServices>    services.AddSession(options => {            options.IdleTimeout = TimeSpan.FromMinutes(30);//存储时长        });<method --> Configure >    // 重要: session的注册必须在UseMvc之前，因为MVC里面要用         app.UseSession();

. NET Core 2.0 MVC initial learning