Asp.net Mvc 中的模型绑定

asp.net mvc中的模型绑定可以在提交http请求的时候，进行数据的映射。

1.没有模型绑定的时候

 public ActionResult Example0()
 {
     if (Request.Form.Count > )
     {
         string id = Request.Form["Id"];
         string fname =Request.Form["FirstName"];
         string lname = Request.Form["LastName"];
         ViewBag.StatusMessage = "Employee data received successfully for ID " + id  + "!";
     }
     return View();
 }

2.简单绑定数据

 [HttpPost]
 public ActionResult Example1(string id, string firstname, string lastname)
 {
     ViewBag.StatusMessage = "Employee data received successfully for ID " + id + "!";
     return View();
 }

页面内容

 <tr>
 ...
   <td>
     <input name="Id" type="text" />
   </td>
 </tr>
 <tr>
 ...
   <td>
      <input name="FirstName" type="text" />
   </td>
 </tr>
 <tr>
 ...
   <td>
      <input name="LastName" type="text" />
   </td>
 </tr>

3.绑定一个类类型

 [HttpPost]
 public ActionResult Example2(Employee emp)
 {
    ViewBag.StatusMessage = "Employee data received successfully for ID " + emp.Id + "!";
    return View();
 }

类如下：

 public class Employee
 {
     public string Id { get; set; }
     public string FirstName { get; set; }
     public string LastName { get; set; }
 }

4.绑定一个类的属性

 [HttpPost]
 public ActionResult Example3(Employee emp)
 {
    ViewBag.StatusMessage = "Employee data received successfully for ID " + emp.Id + "!";
    return View();
 }

类如下：

 public class Employee
 {
     public string Id { get; set; }
     public string FirstName { get; set; }
     public string LastName { get; set; }
     public Address HomeAddress { get; set; }
 }

 public class Address
 {
     public string Street { get; set; }
     public string Country { get; set; }
     public string PostalCode { get; set; }
 }

页面内容：

 <tr>
 ...
 <td>
    <input name="HomeAddress.Street" type="text" /></td>
 </tr>
 ...
 <td>
    <input name="HomeAddress.Country" type="text" /></td>
 </tr>
 ...
 <td>
    <input name="HomeAddress.PostalCode" type="text" /></td>
 </tr>

5.绑定简单类型的集合

 [HttpPost]
 public ActionResult Example4(IList<string> id, IList<string> name)
 {
     ViewBag.StatusMessage = "Employee data received successfully for " + id.Count + " records!";
     return View();
 }

页面内容：

 ...
 <tr>
   <td align="right" nowrap="nowrap" width="15%">
     <input name="id" type="text" size="" /></td>
   <td>
     <input name="name" type="text" />
   </td>
 </tr>
 <tr>
   <td align="right" nowrap="nowrap" width="15%">
     <input name="id" type="text" size="" />
   </td>
   <td>
     <input name="name" type="text" />
   </td>
 </tr>
 <tr>
   <td align="right" nowrap="nowrap" width="15%">
     <input name="id" type="text" />
   </td>
   <td>
     <input name="name" type="text" />
   </td>
 </tr>
 ...

6.绑定一个类的集合

 [HttpPost]
 public ActionResult Example5(IList<Employee> employees)
 {
     ViewBag.StatusMessage = "Employee data received successfully for " + employees.Count + " records!";
     return View();
 }

页面内容：

 ...
         <tr>
             <td align="right" nowrap="nowrap" width="15%">
                 <input name="[0].id" type="text" size="" />
             </td>
             <td>
                 <input name="[0].FirstName" type="text" />
             </td>
             <td>
                 <input name="[0].LastName" type="text" />
             </td>
         </tr>
         <tr>
             <td align="right" nowrap="nowrap" width="15%">
                 <input name="[1].id" type="text" size="" />
             </td>
             <td>
                 <input name="[1].FirstName" type="text" />
             </td>
             <td>
                 <input name="[1].LastName" type="text" />
             </td>
         </tr>

 ...

注意索引是从0开始，中间不间断

如果，遇到有动态的Add和Delete功能，则索引不好去设置，可以使用下面的方法：

添加一个隐藏控件，控件名称后缀为.Index

Controller不变，页面内容更改为：

 ...
 <tr>
     <td align="right" nowrap="nowrap" width="15%">
         <input  type="hidden" name="employees.Index" value="" />
         <input name="employees[100].id" type="text" size="" />
     </td>
     <td>
         <input name="employees[100].FirstName" type="text" />
     </td>
     <td>
         <input name="employees[100].LastName" type="text" />
     </td>
 </tr>
 <tr>
     <td align="right" nowrap="nowrap" width="15%">
         <input  type="hidden" name="employees.Index" value="ccc" />
         <input name="employees[ccc].id" type="text" size="" />
     </td>
     <td>
         <input name="employees[ccc].FirstName" type="text" />
     </td>
     <td>
         <input name="employees[ccc].LastName" type="text" />
     </td>
 </tr>
 ...

7.可自定义模型

 [HttpPost]
 public ActionResult Example6([ModelBinder(typeof(EmployeeBinder1))]Employee employee)
 {
     ViewBag.StatusMessage = "Employee data received successfully for " + employee.Id + "!";
     return View();
 }

绑定方法：

 public class EmployeeBinder1:IModelBinder
 {
     public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
     {
         Employee emp = new Employee();
         emp.Id = "E" + controllerContext.HttpContext.Request.Form["Id"];
         emp.FirstName = controllerContext.HttpContext.Request.Form["FirstName"];
         emp.LastName = controllerContext.HttpContext.Request.Form["LastName"];
          emp.BirthDate = new DateTime(int.Parse(controllerContext.HttpContext.Request.Form["year"]),
             int.Parse(controllerContext.HttpContext.Request.Form["month"]),
             int.Parse(controllerContext.HttpContext.Request.Form["day"]));
         return emp;
     }
 }