.net core 2.0 mvc 初步學習

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 IConfiguration Configuration { get; set; }

        public StudyStartup()
        {

        }

        /// <summary>
        /// 用於獲取配置信息
        /// </summary>
        /// <param name="configuration"></param>
        public StudyStartup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IServiceProvider ConfigureServices(IServiceCollection services)
        {

            //註入mvc
            services.AddMvc();

            //添加Options
            services.AddOptions();

            //獲取配置信息
            services.Configure<AppSetting>(Configuration.GetSection(nameof(AppSetting)));

            //開啟Session功能
            services.AddSession(options ={
                options.IdleTimeout = TimeSpan.FromMinutes(30);
            });

            //構建一個預設的serviceProvider處理對象
            return services.BuildServiceProvider();
        }

        public void Configure(IApplicationBuilder app,
            IHostingEnvironment environment,
            ILoggerFactory loggerFactory,
            IHttpContextFactory httpContextFactory,
            DiagnosticSource diagnosticSource,
            DiagnosticListener diagnosticListener)
        {
            //當前環境為開發環境
            if (environment.IsDevelopment())
            {
                app.UseBrowserLink();
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }

            // 重要: session的註冊必須在UseMvc之前，因為MVC裡面要用 
            app.UseSession();

            //使用webroot中的靜態文件
            app.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)

相關源碼
IWebHostBuilder webHostBuilder = WebHost.CreateDefaultBuilder(args);

方法解析

public static IWebHostBuilder CreateDefaultBuilder(string[] args)
{
  return new WebHostBuilder()
      .UseKestrel()//Specify Kestrel as the server to be used by the web host.
      .UseContentRoot(Directory.GetCurrentDirectory())//採用當前目錄作為內容跟目錄
      //配置信息處理
      .ConfigureAppConfiguration((Action<WebHostBuilderContext, IConfigurationBuilder>) ((hostingContext, config) =>
      {
             //註入運行環境
            IHostingEnvironment hostingEnvironment = hostingContext.HostingEnvironment;
              //載入配置文件
            config.AddJsonFile("appsettings.json", true, true).AddJsonFile(string.Format("appsettings.{0}.json", (object) hostingEnvironment.EnvironmentName), true, true);
          //根據運行環境載入相應文件
            if (hostingEnvironment.IsDevelopment())
            {
              Assembly assembly = Assembly.Load(new AssemblyName(hostingEnvironment.ApplicationName));
              if (assembly != (Assembly) null)
                config.AddUserSecrets(assembly, true);
            }

            config.AddEnvironmentVariables();
            if (args == null)
              return;
            config.AddCommandLine(args);
      }))
      //配置日誌信息
      .ConfigureLogging((Action<WebHostBuilderContext, ILoggingBuilder>) ((hostingContext, logging) =>
      {
        logging.AddConfiguration((IConfiguration) hostingContext.Configuration.GetSection("Logging"));
        logging.AddConsole();
        logging.AddDebug();
      }))
      .UseIISIntegration()//採用IIS進行發佈
      .UseDefaultServiceProvider((Action<WebHostBuilderContext, ServiceProviderOptions>) ((context, options) => options.ValidateScopes = context.HostingEnvironment.IsDevelopment()));//採用預設的處理機制
}

即若需要使用startup的有參構造，則需要在configureappconfiguration中進行配置相應處理類

請求走向:

初始:Run --> ConfigureServices --> Configure

配置信息的獲取:

<Controller>

protected AppSetting ConfigInfo { get; set; }

    //讀取配置信息
protected BaseController(IOptions<AppSetting> options) => ConfigInfo = options.Value;

DI註入

1.創建的DI註入在ConfigureServices進行處理

註入方式：

services.AddSingleton(u => new MonsterDIController(new GuestDal()));//指定控制器進行註入

services.AddSingleton<IDal,DefaultDal>();//統一註入  全局共用一個

services.AddTransient<IDal, DefaultDal>();//統一註入    每次使用都不一樣，不同的類或不同的方法使用都不一樣

services.AddScoped<IDal, EmptyDal>();//統一註入   一次請求共用一個對象

註：
    當對同一類型構造傳入不同類型對象的註入時，
    不考慮註入類型或範圍
    已最終註入類型為傳入對象創建實例

例如:
    <Controller>

        protected IDal Dal { get; set; }

        public MonsterDIController(IDal dal)
        {
            this.Dal = dal;
        }

    <ConfigureServices>
        如上述一致

    <Result>
        最終創建實例時，會傳入EmptyDal

開啟Session功能：

<method --> ConfigureServices>

    services.AddSession(options => {
            options.IdleTimeout = TimeSpan.FromMinutes(30);//存儲時長
        });

<method --> Configure >
    // 重要: session的註冊必須在UseMvc之前，因為MVC裡面要用 
        app.UseSession();