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.NET：自动将请求参数绑定到ASPX、ASHX和MVC（菜鸟必看）

news 来源：原创 2024/4/24 19:07:23

前言

刚开始做AJAX应用的时候，经常要手工解析客户端传递的参数，这个过程极其无聊，而且代码中充斥着：Request["xxx"]之类的代码。

这篇文章的目的就是告诉初学者如何自动将客户端用AJAX发送的参数自动绑定为强类型的成员属性或方法参数。

自动绑定到ASPX和ASHX

框架支持

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Happy.Web
 8 {
 9     public interface IWantAutoBindProperty
10     {
11     }
12 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace Happy.Web
 8 {
 9     [AttributeUsage(AttributeTargets.Property, AllowMultiple = true)]
10     public sealed class AutoBind : Attribute
11     {
12     }
13 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 using System.Web;
 8 
 9 using Newtonsoft.Json;
10 
11 using Happy.ExtensionMethods.Reflection;
12 
13 namespace Happy.Web
14 {
15     public class JsonBinderModule : IHttpModule
16     {
17         public void Init(HttpApplication context)
18         {
19             context.PreRequestHandlerExecute += OnPreRequestHandlerExecute;
20         }
21 
22         private void OnPreRequestHandlerExecute(object sender, EventArgs e)
23         {
24             if (!(HttpContext.Current.CurrentHandler is IWantAutoBindProperty))
25             {
26                 return;
27             }
28 
29             var properties = HttpContext.Current.CurrentHandler.GetType().GetProperties();
30 
31             foreach (var property in properties)
32             {
33                 if (!property.IsDefined(typeof(AutoBind), true))
34                 {
35                     continue;
36                 }
37 
38                 string json = HttpContext.Current.Request[property.Name];
39 
40                 var value = JsonConvert.DeserializeObject(json, property.PropertyType);
41 
42                 property.SetValue(HttpContext.Current.Handler, value);
43             }
44         }
45 
46         public void Dispose()
47         {
48         }
49     }
50 }

代码示例

 1 <?xml version="1.0" encoding="utf-8"?>
 2 
 3 <configuration>
 4 
 5     <system.web>
 6       <compilation debug="false" targetFramework="4.0" />
 7       <httpModules>
 8         <add name="JsonBinderModule" type="Happy.Web.JsonBinderModule"/>
 9       </httpModules>
10     </system.web>
11 
12 </configuration>

 1 /// <reference path="../ext-all-debug-w-comments.js" />
 2 var data = {
 3     Name: '段光伟',
 4     Age: 28
 5 };
 6 
 7 Ext.Ajax.request({
 8     url: '../handlers/JsonBinderTest.ashx',
 9     method: 'POST',
10     params: { user: Ext.encode(data) }
11 });

 1 <%@ WebHandler Language="C#" Class="JsonBinderTest" %>
 2 
 3 using System;
 4 using System.Web;
 5 
 6 using Happy.Web;
 7 
 8 public class JsonBinderTest : IHttpHandler, IWantAutoBindProperty
 9 {
10     [AutoBind]
11     public User user { get; set; }
12 
13     public void ProcessRequest(HttpContext context)
14     {
15         context.Response.ContentType = "text/plain";
16         context.Response.Write(string.Format("姓名：{0}，年龄：{1}", user.Name, user.Age));
17     }
18 
19     public bool IsReusable
20     {
21         get
22         {
23             return false;
24         }
25     }
26 }
27 
28 public class User
29 {
30     public string Name { get; set; }
31 
32     public int Age { get; set; }
33 }

运行结果

自动绑定到MVC

框架支持

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 using System.Web.Mvc;
 8 
 9 using Newtonsoft.Json;
10 
11 namespace Tenoner.Web.Mvc
12 {
13     public class JsonBinder : IModelBinder
14     {
15         public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
16         {
17             string json = controllerContext.HttpContext.Request[bindingContext.ModelName];
18 
19             return JsonConvert.DeserializeObject(json, bindingContext.ModelType);
20         }
21     }
22 }