ASP.NET MVC 中的重载 ViewModel 构造函数和 HttpPost

Question

我在 Whosebug 中找到的最接近我的问题是 Posting data when my view model has a constructor does not work

型号

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

ViewModel

    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
    }

查看代码

    @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>
    }

错误

只是消除错误但没有帮助的解决方案

添加默认构造函数（参数为空 - 不符合我的目的）
没有重载的构造函数（那时我的模型将是空的）

问题

我想我需要一个自定义模型活页夹。不知道如何创建一个:-(

(或)

我想知道我在这里还有哪些其他选择

Answer 1

您需要添加一个无参数构造函数。

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

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

您认为这是 'not working' 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，您的 POST 方法的参数也被命名为 customer（DefaultModelBinder 不区分大小写).结果，绑定失败。您需要将参数名称更改为您的属性名称以外的任何名称，例如

[HttpPost]
public ActionResult CreateCustomer(CustomerViewModel model)

ASP.NET MVC 中的重载 ViewModel 构造函数和 HttpPost

Overloaded ViewModel Constructor and HttpPost in ASP.NET MVC

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