希望实现的效果是：对购物车中所有商品的总价，实现9折或8折：
当点击"9折"：
当点击"8折"：
□ 思路
8折或9折是打折接口的不同实现，关键是：由什么条件决定使用哪种打折方式？
--当点击8折或9折链接的时候，把参数放在路由中，然后在自定义控制器工厂中根据参数的不同选择使用哪种打折方式。
□ model
public class CartLine
{
public int Id { get; set;
}
public string Name { get; set;
}
public decimal Price { get; set;
}
public int Quantity { get; set;
}
}
□ 接口
using MvcApplication2.Models;
namespace MvcApplication2
{
public interface
IDiscount
{
decimal GetFinalPrice(List<CartLine> cartLines);
}
}
□ 接口的2种实现
using System.Collections.Generic;
namespace MvcApplication2.implementation
{
public class NineDiscount : IDiscount
{
public decimal GetFinalPrice(List<Models.CartLine> cartLines)
{
decimal result = 0.0M;
foreach (var item in cartLines)
{
result += item.Price*item.Quantity;
}
return result*(90M/100M);
}
}
}
using System.Collections.Generic;
namespace MvcApplication2.implementation
{
public class EightDiscount : IDiscount
{
public decimal GetFinalPrice(List<Models.CartLine> cartLines)
{
decimal result = 0.0M;
foreach (var item in cartLines)
{
result += item.Price * item.Quantity;
}
return result * (80M / 100M);
}
}
}
□ HomeController
using System.Collections.Generic;
using System.Web.Mvc;
using MvcApplication2.Models;
namespace MvcApplication2.Controllers
{
public class HomeController : Controller
{
public ActionResult Index()
{
List<CartLine> cartLines = new List<CartLine>()
{
new CartLine(){Id = 1, Name = "Product1", Price = 80M, Quantity = 2},
new CartLine(){Id = 2, Name = "Product2", Price = 100M, Quantity = 3},
};
Session["cart"] = cartLines;
return View(cartLines);
}
}
}
□ Home/Index.cshtml
把不同的打折方式放在路由中传递。
@model List<MvcApplication2.Models.CartLine>
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Index</h2>
<table>
<tr style="background-color: #e3e3e3;">
<td>产品</td>
<td>价格</td>
<td>数量</td>
</tr>
@foreach (var item in Model)
{
<tr>
<td>@item.Name</td>
<td>@string.Format("{0:C}", item.Price)</td>
<td>@item.Quantity</td>
</tr>
}
</table>
<p>
@Html.ActionLink("9折购买", "Index", "Shop", new {policy = "Nine"},new {})
</p>
<p>
@Html.ActionLink("8折购买", "Index", "Shop", new {policy = "Eight"},new {})
</p>
□ 自定义控制器工厂，使用Ninject，根据路由参数policy的不同，决定选择具体的打折接口实现
using System;
using System.Web.Mvc;
using System.Web.Routing;
using MvcApplication2.implementation;
using Ninject;
namespace MvcApplication2.Extension
{
public class NinjectControllerFactory : DefaultControllerFactory
{
IKernel ninjectKernel;
string policy = "";
public NinjectControllerFactory()
{
ninjectKernel = new StandardKernel();
}
protected override IController GetControllerInstance(RequestContext requestContext, Type controllerType)
{
if (requestContext.RouteData.Values["policy"] != null)
{
policy = requestContext.RouteData.Values["policy"].ToString();
}
AddBindings();
return controllerType == null ? null : (IController) ninjectKernel.Get(controllerType);
}
private void AddBindings()
{
switch (policy)
{
case "Eight":
ninjectKernel.Rebind<IDiscount>().To<EightDiscount>();
break;
case "Nine":
ninjectKernel.Rebind<IDiscount>().To<NineDiscount>();
break;
default:
ninjectKernel.Rebind<IDiscount>().To<NineDiscount>();
break;
}
}
}
}
□ 自定义控制器工厂全局注册
ControllerBuilder.Current.SetControllerFactory(new NinjectControllerFactory());
□ ShopController中使用打折接口方法
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using MvcApplication2.Models;
namespace MvcApplication2.Controllers
{
public class ShopController : Controller
{
public IDiscount _Discount;
public ShopController(IDiscount discount)
{
this._Discount = discount;
}
public ActionResult Index(string policy)
{
List<CartLine> cartLines = new List<CartLine>();
if (Session["cart"] != null)
{
cartLines = (List<CartLine>)Session["cart"];
}
ViewData["total"] = String.Format("{0:C}",_Discount.GetFinalPrice(cartLines));
return View();
}
}
}
□ Shop/Index.cshtml
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
打折后的价格为： @ViewData["total"]
□ 自定义路由
为了让url更直观，符合controller/action/paramter：
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{policy}",
defaults: new { controller = "Home", action = "Index", policy = UrlParameter.Optional }
);
MVC扩展控制器工厂,通过继承DefaultControllerFactory来决定使用哪个接口实现,使用Ninject,布布扣,bubuko.com
MVC扩展控制器工厂,通过继承DefaultControllerFactory来决定使用哪个接口实现,使用Ninject