c# - 查看数据在 MVC 2 中无法正常工作

Question

嗯，我是 mvc 的新手，我一直是这里的一大难题。我想使用 ViewData 将数据从操作方法传递到我的 View 。我在 visual studio 2008 中使用 Asp.net MVC 2.0。我知道如何使用来自操作方法的 View 数据以及如何在 View 中使用它。

Here is what i have written in my action method : - 

             public ActionResult Index()
                    {
                        NorthWindEntities db = new NorthWindEntities();
                        var data = (from id in db.Orders
                                    join ordid in db.Order_Details on id.OrderID equals                  ordid.OrderID
                                    select new
                                    {
                                        orderid = id.OrderID,
                                        productid = ordid.ProductID,
                                        discount = ordid.Discount
                                    }
                                      );
                        ViewData["Data"] = data;
                        return View();
                    }

这是 View 中的代码:-

        <%foreach (var item in (IEnumerable)ViewData["Data"] )
          {
              Response.Write(item.orderId);

          } %>

它给出了这样的错误..

'object' does not contain a definition for 'orderId' and no extension method 'orderId' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

提前致谢

Answer 1

尝试以下操作(使用 View 模型是一种最佳实践...创建一个类 OrderViewModel，然后像这样用您选择的新 OrderViewModel 填充它...

namespace MyApp.ViewModels
{
    public class OrderViewModel
    {
        public int OrderId { get; set; }

        public int ProductId { get; set; }

        public int Discount { get; set; }
    }
}

public ActionResult Index()
{
    NorthWindEntities db = new NorthWindEntities();

    List<OrderViewModel> data = (from id in db.Orders
                                join ordid in db.Order_Details on id.OrderID equals ordid.OrderID
                                select new OrderViewModel()
                                {
                                    OrderId = id.OrderID,
                                    ProductId = ordid.ProductID,
                                    Discount = ordid.Discount
                                }).ToList();

    ViewData["Data"] = data;
    return View();

然后在您的 View 页面中...

@using MyApp.ViewModels

<%foreach (var item in (List<OrderViewModel>)ViewData["Data"] )
{
    Response.Write(item.orderId);
}%>