.net core MVC中级教程（一）

一、建立.net core2.2 mvc项目
二、建立数据模板、服务、控制器
三、建立视图

此次教程废话少说，看不懂可以看我初级教程

一、建立.net core2.2 mvc项目

建立TutorialStudy.Web空项目

二、建立数据模板、服务、控制器

建立四、五个文件夹

在Model文件夹下建立Student类与Gender枚举

using System;
namespace TutorialStudy.Model
{
    public class Student
    {
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime BirthDate { get; set; }
        public Gender Gender { get; set; }
    }
}

namespace TutorialStudy.Model
{
    public enum Gender
    {
        女士=0,
        男士=1,
        其他=2
    }
}

在Services文件内添加接口IRepository与实现类InMemoryRepository

using System.Collections.Generic;

namespace TutorialStudy.Services
{
    public interface IRepository<T> where T:class
    {
        IEnumerable<T> GetAll();
        T GetById(int studentId);
        T Add(int i);
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using TutorialStudy.Model;

namespace TutorialStudy.Services
{
    public class InMemoryRepository:IRepository<Student>
    {
        private readonly List<Student> _student;

        public InMemoryRepository()
        {
           _student=new List<Student>
           {
               new Student
               {
                   Id=1,
                   FirstName = "龙",
                   LastName = "族",
                   BirthDate = new DateTime(1998,10,14),
                   Gender = Gender.男士
               },
               new Student
               {
                   Id=2,
                   FirstName = "醉",
                   LastName = "人",
                   BirthDate = new DateTime(1998,10,14),
                   Gender = Gender.男士
               },
               new Student
               {
                   Id=3,
                   FirstName = "东方",
                   LastName = "不败",
                   BirthDate = new DateTime(2008,2,14),
                   Gender = Gender.女士
               }
           };

        }

        public IEnumerable<Student> GetAll()
        {
            return _student;
        }

        public Student GetById(int studentId)
        {
            return _student.FirstOrDefault(x => x.Id == studentId);
        }

        public Student Add(int i)
        {
            throw new NotImplementedException();
        }
    }
}

在Statup类中进行注册服务

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using TutorialStudy.Model;
using TutorialStudy.Services;

namespace TutorialStudy
{
    public class Startup
    {
        // This method gets called by the runtime. Use this method to add services to the container.
        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddScoped<IRepository<Student>, InMemoryRepository>();
            services.AddMvc();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseStaticFiles();
            app.UseStatusCodePages();
            app.UseMvc(routes => { routes.MapRoute("Default", "{controller=Home}/{action=Index}/{id?}"); });


            app.Run(async (context) =>
            {
                await context.Response.WriteAsync("Hello World!");
            });
        }
    }
}

接下来是视图模板，为视图提供数据的模板，

建立StudentViewModel类

using TutorialStudy.Model;

namespace TutorialStudy.ViewModel
{
    public class StudentViewModel
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public Gender Gender { get; set; }
    }
}

using System.Collections.Generic;

namespace TutorialStudy.ViewModel
{
    public class HomeIndexViewModel
    {
        public IEnumerable<StudentViewModel> Students { get; set; }
    }
}

接下来是控制器，在Controllers文件夹内建立HomeController类

using Microsoft.AspNetCore.Mvc;
using System;
using System.Linq;
using TutorialStudy.Model;
using TutorialStudy.Services;
using TutorialStudy.ViewModel;

namespace TutorialStudy.Controllers
{
    public class HomeController:Controller
    {
        private readonly IRepository<Student> _repository;

        public HomeController(IRepository<Student> repository)
        {
            _repository = repository;
        }

        [HttpGet]
        public IActionResult Index()
        {
            var list = _repository.GetAll();

            var vms = list.Select(x => new StudentViewModel
            {
                Id = x.Id,
                Name = $"{x.FirstName}{x.LastName}",
                Age = DateTime.Now.Subtract(x.BirthDate).Days / 365,
                Gender = x.Gender
            });

            var vm=new HomeIndexViewModel
            {
                Students = vms
            };
            return View(vm);
        }
    }
}

三、建立视图

对了，把视图数据模板放入视图里面去

在里面建立Home文件夹，建立

@addTagHelper *,Microsoft.AspNetCore.Mvc.TagHelpers
大小写不要错，这句话是为了能在cshtml里面写c#语句而写的
再建立视图

@model TutorialStudy.Views.ViewModel.HomeIndexViewModel

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width"/>
    <title>学生信息主页</title>
</head>
<body>
<h1>Student</h1>
<ul>
    @foreach (var s in Model.Students)
    {
        <li>
            @s.Name (@s.Age)
        </li>
    }
</ul>
</body>
</html>

然后运行

额，，，上面的草帽小子骷髅头是谷歌浏览器的主题，这是就可以看见其信息了，
第一步暂时完成
本教程将会持续更新哦，不懂得可以留言，最好先看看我的mvc初级教程再来看这个
github地址：https://github.com/1045683477/.net-core-mvc-intermediate