Asp.net mvc ASP.NET MVC中重载的ViewModel构造函数和HttpPost

我在StackOverflow中找到的最接近我的问题是

型号

    public class Customer
    {
        public int Id { get; set; }                
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class CustomerViewModel
    {
        public Customer Customer { get; set; }

        public CustomerViewModel(Customer customer)
        {
            Customer = customer;        
        }
    }

视图模型

    public class Customer
    {
        public int Id { get; set; }                
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class CustomerViewModel
    {
        public Customer Customer { get; set; }

        public CustomerViewModel(Customer customer)
        {
            Customer = customer;        
        }
    }

控制器代码

    public ActionResult CreateCustomer()
    {
        Customer c = new Customer();
        CustomerViewModel cvm = new CustomerViewModel(c);
        return View(cvm);
    }

    [HttpPost]
    public ActionResult CreateCustomer(CustomerViewModel customer)
    {
       // do something here
    }

    @model Blah.Models.CustomerViewModel

    @{
        ViewBag.Title = "CreateCustomer";
     }

    <h2>CreateCustomer</h2>

    @using (Html.BeginForm()) 
    { 
        <div class="editor-label">
          @Html.LabelFor(model => model.Customer.FirstName)
        </div>
        <div class="editor-field">
          @Html.EditorFor(model => model.Customer.FirstName)
          @Html.ValidationMessageFor(model => model.Customer.FirstName)
        </div>

        <div class="editor-label">
          @Html.LabelFor(model => model.Customer.LastName)
        </div>
        <div class="editor-field">
          @Html.EditorFor(model => model.Customer.LastName)
          @Html.ValidationMessageFor(model => model.Customer.LastName)
        </div>

        <p>
          <input type="submit" value="Create" />
        </p>
    }

查看代码

    public ActionResult CreateCustomer()
    {
        Customer c = new Customer();
        CustomerViewModel cvm = new CustomerViewModel(c);
        return View(cvm);
    }

    [HttpPost]
    public ActionResult CreateCustomer(CustomerViewModel customer)
    {
       // do something here
    }

    @model Blah.Models.CustomerViewModel

    @{
        ViewBag.Title = "CreateCustomer";
     }

    <h2>CreateCustomer</h2>

    @using (Html.BeginForm()) 
    { 
        <div class="editor-label">
          @Html.LabelFor(model => model.Customer.FirstName)
        </div>
        <div class="editor-field">
          @Html.EditorFor(model => model.Customer.FirstName)
          @Html.ValidationMessageFor(model => model.Customer.FirstName)
        </div>

        <div class="editor-label">
          @Html.LabelFor(model => model.Customer.LastName)
        </div>
        <div class="editor-field">
          @Html.EditorFor(model => model.Customer.LastName)
          @Html.ValidationMessageFor(model => model.Customer.LastName)
        </div>

        <p>
          <input type="submit" value="Create" />
        </p>
    }

@model Blah.Models.CustomerViewModel
@{
ViewBag.Title=“CreateCustomer”；
}
创建客户
@使用（Html.BeginForm（））
{ 
@LabelFor（model=>model.Customer.FirstName）
@EditorFor（model=>model.Customer.FirstName）
@Html.ValidationMessageFor（model=>model.Customer.FirstName）
@LabelFor（model=>model.Customer.LastName）
@EditorFor（model=>model.Customer.LastName）
@Html.ValidationMessageFor（model=>model.Customer.LastName）


}

错误

仅消除错误但没有帮助的解决方案

    public class Customer
    {
        public int Id { get; set; }                
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }

    public class CustomerViewModel
    {
        public Customer Customer { get; set; }

        public CustomerViewModel(Customer customer)
        {
            Customer = customer;        
        }
    }

• 添加默认构造函数（参数为空-不符合我的目的）
• 不要使用重载构造函数（我的模型将是空的）

问题

我想我这里需要一个定制的模型活页夹。不知道如何创建一个：-(

（或）

---

我想知道我这里还有哪些选项

您需要添加无参数构造函数

public class CustomerViewModel
{
    public Customer Customer { get; set; }

    public CustomerViewModel()
    {
    }
    public CustomerViewModel(Customer customer)
    {
        Customer = customer;        
    }
}

您认为这“不起作用”的原因是另一个问题。您的模型有一个名为

Customer

的属性，它是一个复杂类型，并且POST方法的参数也被命名为

Customer

（

DefaultModelBinder

不区分大小写）。因此，绑定失败。例如，您需要将参数名称更改为除某个属性名称以外的任何名称

[HttpPost]
public ActionResult CreateCustomer(CustomerViewModel model)

---

这个人遇到的问题非常相似：尝试在

CustomerServiceWModel

中添加无参数构造函数，因为AFAIK MVC需要默认的无参数构造函数。同时使用无参数构造函数和带有

Customer

类参数的构造函数有什么问题？将无参数构造函数添加为以及您现有的构造函数。您的模型将不会为空。如果您有绑定到

Customer

属性的控件，则

Customer

将在回发时正确绑定。您当然不需要自定义模型绑定器。