ASP.NET Core API+MVC+Redis 模拟购物车

效果：

步骤：
1、打开vs2019创建项目，选择asp.net core web 应用程序，选择API，开始创建
2、点项目右键，在管理NuGet程序包选择EF，添加图片
3、选择vs工具的管理NuGet程序，在选择程序包管理器控制台
4、输入：Scaffold-DbContext ‘Data Source=.;Initial Catalog=ShoppingDB; Integrated Security=True;’ Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -Context ShopContext
这里需要注意的是：ShoppingDB是数据库的名称， ShopContext是上下文
5、在appsettings.json添加

"ConnectionStrings": {
    "shopdb": "Data Source=.;Initial Catalog=ShoppingDB;Integrated Security=True;"
  },

6、在Startup.cs 文件里面的public void ConfigureServices(IServiceCollection services)添加

services.AddDbContext<ShopContext>(options =>
			{
				options.UseSqlServer(Configuration.GetConnectionString("shopdb"));
			});

注意：shopdb是appsettings.json里面添加的shopdb
7、在Controllers文件夹添加控制器，选择空的api，添加路由 [Route(“api/[controller]/[action]”)]
注意，如果不加api，这个接口是不能正确显示数据的
页面代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;
using WebAPI.Models;

namespace WebAPI.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class ProductsController : ControllerBase
    {
        private readonly ILogger<ProductsController> _logger;
        ShopContext db;
        public ProductsController(ILogger<ProductsController> logger, ShopContext shopContext)
        {
            _logger = logger;
            db = shopContext;
        }
        //获得所有商品
        [HttpGet]
        public IEnumerable<Models.Products> GetAllProducts()
        {
            return db.Products.ToList();
        }
    }
}

接下来在解决方案上面添加新的项目，选择asp.net Core web应用程序，选择web应用程序（模型视图控制器）
把api里面生成的models的实体类拷贝到mvc的model里面，别忘记改命名空间
1、在NuGet程序包添加Newtonsoft.Json
2、在控制器的index页面添加
在这里插入图片描述
//显示页面数据

public async Task<IActionResult> Index()
		{
			
			HttpClient httpClient = new HttpClient();
			Task<string> task = httpClient.GetStringAsync("https://localhost:5001/api/Products/GetAllProducts");
			var result = await task;
			list = JsonConvert.DeserializeObject<IEnumerable<Products>>(result);
			return View(list);
		}

3、Index.cshtml 页面如下：

@{
    ViewData["Title"] = "Home Page";
}

<h1>商品列表</h1>
<table class="table table-striped table-hover">
    <tr>
        <th>商品名称</th>
        <th>商品价格</th>
        <th>操作</th>
    </tr>
    <tbody>
        @foreach (var item in Model)
        { 
            <tr>
                <td>@item.Name</td>
                <td>@string.Format("{0:C}元", item.Price)</td>
                <td><a href="@Url.Action("Detils","Home",new { id=item.Id})" class="btn btn-primary btn-lg">添加到购物车</a></td>
            </tr>
        }
    </tbody>
</table>

4、先把api设为启动项，启动步调试，在设置mvc为启动项，启动步调试，页面就可以显示出来了
5、打开redis的服务，先找到redis的目录输入redis-server redis.windows.conf 指令
6、先声明 RedisCache redisClient = null;
在控制器的构造方法里面添加
//创建Redis客户端对象

RedisCacheOptions options = new RedisCacheOptions()
	{
		InstanceName = "MyRedis",
		Configuration = "127.0.0.1:6379,abortConnect=false"
	};
	redisClient = new RedisCache(options);

7、实现添加购物和删除购物车的方法和页面

static IEnumerable<Products> list = null;
static List<Products> listnew = new List<Products>();
static Dictionary<string, int> dis = new Dictionary<string, int>(); 
//实现购物车添加
public async Task<IActionResult> Detils(int id)
		{
			int num = 1;
			string result = string.Empty;

			if (list != null)
			{
				foreach (var item in list)
				{
					if (item.Id == id)
					{
						
						if (!listnew.Contains(item))
						{
							listnew.Add(item);
							dis.Add(item.Name,num);
						}
						else
						{
								if (dis.ContainsKey(item.Name))
								{
									int num_1 = dis[item.Name];
								     ++num_1;
								   dis[item.Name] = num_1;
								}
							
							
						}
						
						var json = JsonConvert.SerializeObject(dis);
						redisClient.SetString("newProd", json);
						
					}
					}
				}
			var data = redisClient.GetString("newProd");
			ViewBag.Prod = JsonConvert.DeserializeObject(data);
			//ViewBag.Result = db.StringGet("hash");
			return View(listnew);
		}
		//实现购物车减少
		public async Task<IActionResult> Delete(int id)
		{
			string result = string.Empty;

			if (list != null)
			{
				foreach (var item in list)
				{
					if (item.Id == id)
					{

						if (listnew.Contains(item))
						{
							
							if (dis.ContainsKey(item.Name))
							{
								int num_1 = dis[item.Name];
								--num_1;
								dis[item.Name] = num_1;
								if (num_1 == 0)
								{
									listnew.Remove(item);
								}
							}


						}

						var json = JsonConvert.SerializeObject(dis);
						redisClient.SetString("newProd", json);

					}
				}
			}
			var data = redisClient.GetString("newProd");
			ViewBag.Prod = JsonConvert.DeserializeObject(data);
			//ViewBag.Result = db.StringGet("hash");
			return View("Detils",listnew);
		}

显示页面：Detils.cshtml

@{
    ViewData["Title"] = "Detils";
}

<h1>购物车</h1>
<table class="table table-striped table-hover">
    <tr>
        <th>商品名称</th>
        <th>商品数量</th>
        <th>小计</th>
        <th>操作</th>
    </tr>
    <tbody>
        @foreach (var item in Model)
        {
           
                    <tr>
                        <td>@item.Name</td>
                        <td>@ViewBag.Prod[item.Name]</td>
                        <td>@string.Format("{0:C}元", item.Price * Convert.ToInt32(ViewBag.Prod[item.Name]))</td>
                        <td><a href="@Url.Action("Delete","Home",new { id=item.Id})" class="btn btn-primary btn-lg">删除</a></td>
                    </tr>

        }
    </tbody>
</table>

ASP.NET Core API+MVC+Redis 模拟购物车

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