Asp.net Mvc 中的模型绑定

小近 发布于 2014/11/27 16:30
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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


 View Code
2.简单绑定数据


1 [HttpPost]
2 public ActionResult Example1(string id, string firstname, string lastname)
3 {
4     ViewBag.StatusMessage = "Employee data received successfully for ID " + id + "!";
5     return View();
6 }
页面内容


复制代码
 1 <tr>
 2 ...
 3   <td>
 4     <input name="Id" type="text" />
 5   </td>
 6 </tr>
 7 <tr>
 8 ...
 9   <td>
10      <input name="FirstName" type="text" />
11   </td>
12 </tr>
13 <tr>
14 ...
15   <td>
16      <input name="LastName" type="text" />
17   </td>
18 </tr>
复制代码
3.绑定一个类类型


1 [HttpPost]
2 public ActionResult Example2(Employee emp)
3 {
4    ViewBag.StatusMessage = "Employee data received successfully for ID " + emp.Id + "!";
5    return View();
6 }


 类如下:


1 public class Employee
2 {
3     public string Id { get; set; }
4     public string FirstName { get; set; }
5     public string LastName { get; set; }
6 }
4.绑定一个类的属性


1 [HttpPost]
2 public ActionResult Example3(Employee emp)
3 {
4    ViewBag.StatusMessage = "Employee data received successfully for ID " + emp.Id + "!";
5    return View();
6 }
类如下:


1 public class Employee
2 {
3     public string Id { get; set; }
4     public string FirstName { get; set; }
5     public string LastName { get; set; }
6     public Address HomeAddress { get; set; }
7 }

1 public class Address
2 {
3     public string Street { get; set; }
4     public string Country { get; set; }
5     public string PostalCode { get; set; }
6 }


页面内容:



 1 <tr>
 2 ...
 3 <td>
 4    <input name="HomeAddress.Street" type="text" /></td>
 5 </tr>
 6 ...
 7 <td>
 8    <input name="HomeAddress.Country" type="text" /></td>
 9 </tr>
10 ...
11 <td>
12    <input name="HomeAddress.PostalCode" type="text" /></td>
13 </tr>



5.绑定简单类型的集合


1 [HttpPost]
2 public ActionResult Example4(IList<string> id, IList<string> name)
3 {
4     ViewBag.StatusMessage = "Employee data received successfully for " + id.Count + " records!";
5     return View();
6 }
页面内容:



 1 ...
 2 <tr>
 3   <td align="right" nowrap="nowrap" width="15%">
 4     <input name="id" type="text" size="20" /></td>
 5   <td>
 6     <input name="name" type="text" />
 7   </td>
 8 </tr>
 9 <tr>
10   <td align="right" nowrap="nowrap" width="15%">
11     <input name="id" type="text" size="20" />
12   </td>
13   <td>
14     <input name="name" type="text" />
15   </td>
16 </tr>
17 <tr>
18   <td align="right" nowrap="nowrap" width="15%">
19     <input name="id" type="text" />
20   </td>
21   <td>
22     <input name="name" type="text" />
23   </td>
24 </tr>
25 ...



6.绑定一个类的集合


1 [HttpPost]
2 public ActionResult Example5(IList<Employee> employees)
3 {
4     ViewBag.StatusMessage = "Employee data received successfully for " + employees.Count + " records!";
5     return View();
6 }
页面内容:


 1 ...
 2         <tr>
 3             <td align="right" nowrap="nowrap" width="15%">
 4                 <input name="[0].id" type="text" size="20" />
 5             </td>
 6             <td>
 7                 <input name="[0].FirstName" type="text" />
 8             </td>
 9             <td>
10                 <input name="[0].LastName" type="text" />
11             </td>
12         </tr>
13         <tr>
14             <td align="right" nowrap="nowrap" width="15%">
15                 <input name="[1].id" type="text" size="20" />
16             </td>
17             <td>
18                 <input name="[1].FirstName" type="text" />
19             </td>
20             <td>
21                 <input name="[1].LastName" type="text" />
22             </td>
23         </tr>
24 
25 ...

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:



 1 ...
 2 <tr>
 3     <td align="right" nowrap="nowrap" width="15%">
 4         <input  type="hidden" name="employees.Index" value="100" />
 5         <input name="employees[100].id" type="text" size="20" />
 6     </td>
 7     <td>
 8         <input name="employees[100].FirstName" type="text" />
 9     </td>
10     <td>
11         <input name="employees[100].LastName" type="text" />
12     </td>
13 </tr>
14 <tr>
15     <td align="right" nowrap="nowrap" width="15%">
16         <input  type="hidden" name="employees.Index" value="ccc" />
17         <input name="employees[ccc].id" type="text" size="20" />
18     </td>
19     <td>
20         <input name="employees[ccc].FirstName" type="text" />
21     </td>
22     <td>
23         <input name="employees[ccc].LastName" type="text" />
24     </td>
25 </tr>
26 ...



7.可自定义模型


1 [HttpPost]
2 public ActionResult Example6([ModelBinder(typeof(EmployeeBinder1))]Employee employee)
3 {
4     ViewBag.StatusMessage = "Employee data received successfully for " + employee.Id + "!";
5     return View();
6 }
绑定方法:



 1 public class EmployeeBinder1:IModelBinder
 2 {
 3     public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
 4     {
 5         Employee emp = new Employee();
 6         emp.Id = "E" + controllerContext.HttpContext.Request.Form["Id"];
 7         emp.FirstName = controllerContext.HttpContext.Request.Form["FirstName"];
 8         emp.LastName = controllerContext.HttpContext.Request.Form["LastName"];
 9          emp.BirthDate = new DateTime(int.Parse(controllerContext.HttpContext.Request.Form["year"]), 
10             int.Parse(controllerContext.HttpContext.Request.Form["month"]), 
11             int.Parse(controllerContext.HttpContext.Request.Form["day"]));
12         return emp;
13     }
14 }

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