在同一页面上渲染两个部分视图

Question

我可以显示所有客户的列表,我可以显示所有订单的列表,我想进一步.

我想在同一页面上呈现两个部分视图,以显示与该客户相关的客户详细信息和订单.

 <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage< MyDemo.Models.CustomerAndOrdersViewModel >" %>

<% Html.RenderPartial("CustomerDetails", this.ViewData.Model.Customer); %>
<% Html.RenderPartial("CustomerOrders", this.ViewData.Model.Order); %>

我创建了一个viewmodel

public class CustomerAndOrdersViewModel
{
    public CustomerAndOrdersViewModel(Customer customer,
                        IEnumerable<Order> orders)
    {
        this.Customer = customer;
        this.Order = orders;
    }

    public Customer Customer { get; set; }
    public IEnumerable<Order> Order { get; set; }
}

在我的客户控制器中我定义了

    ICustomerRepository customerRepository;
    IOrderRepository orderRepository;

    public CustomersController()
        : this(new CustomerRepository())
    {
    }

    public CustomersController(ICustomerRepository repository)
    {
        customerRepository = repository;
    }

    public CustomersController(IOrderRepository repository)
    {
        orderRepository = repository;
    }

然后我尝试将CustomerAndOrdersViewModel传递给详细信息视图

    public ActionResult Details(int id)
    {

        QuestionAndOrderViewModel viewdata = new CustomerAndOrdersViewModel(customerRepository.GetCustomer(id),
                                        orderRepository.FindAllOrders());
        return View(viewdata);
    }

但我收到的错误是"对象引用未设置为对象的实例"对于orderRepository.

我哪里错了？

Answer 1

您的控制器的构造函数只接受一个参数,并且您尝试在同一实例中使用这两个值.

你可以做,例如:

ICustomerRepository customerRepository;
IOrderRepository orderRepository;

public CustomersController()
    : this(new CustomerRepository(), new OrderRepository())
{
}

public CustomersController(
    ICustomerRepository customerRepository, 
    IOrderRepository orderRepository)
{
    this.customerRepository = customerRepository;
    this.orderRepository = orderRepository;
}