基于.NET中:自动将请求参数绑定到ASPX、ASHX和MVC的方法(菜鸟必看)

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

using system;
 using system.collections.generic;
 using system.linq;
 using system.text;
 using system.threading.tasks;

 namespace happy.web
 {
     public interface iwantautobindproperty
     {
     }
 }

using system;
 using system.collections.generic;
 using system.linq;
 using system.text;
 using system.threading.tasks;

 namespace happy.web
 {
     [attributeusage(attributetargets.property, allowmultiple = true)]
     public sealed class autobind : attribute
     {
     }
 }

using system;
 using system.collections.generic;
 using system.linq;
 using system.text;
 using system.threading.tasks;

 using system.web;

 using newtonsoft.json;

 using happy.extensionmethods.reflection;

 namespace happy.web
 {
     public class jsonbindermodule : ihttpmodule
     {
         public void init(httpapplication context)
         {
             context.prerequesthandlerexecute += onprerequesthandlerexecute;
         }

         private void onprerequesthandlerexecute(object sender, eventargs e)
         {
             if (!(httpcontext.current.currenthandler is iwantautobindproperty))
             {
                 return;
             }

             var properties = httpcontext.current.currenthandler.gettype().getproperties();

             foreach (var property in properties)
             {
                 if (!property.isdefined(typeof(autobind), true))
                 {
                     continue;
                 }

                 string json = httpcontext.current.request[property.name];

                 var value = jsonconvert.deserializeobject(json, property.propertytype);

                 property.setvalue(httpcontext.current.handler, value);
             }
         }

         public void dispose()
         {
         }
     }
 }

代码示例

<?xml version="1.0" encoding="utf-8"?>

 <configuration>

     <system.web>
       <compilation debug="false" targetframework="4.0" />
       <httpmodules>
         <add name="jsonbindermodule" type="happy.web.jsonbindermodule"/>
       </httpmodules>
     </system.web>

 </configuration>

/// <reference path="../ext-all-debug-w-comments.js" />
 var data = {
     name: '段光伟',
     age: 28
 };

 ext.ajax.request({
     url: '../handlers/jsonbindertest.ashx',
     method: 'post',
     params: { user: ext.encode(data) }
 });

<%@ webhandler language="c#" class="jsonbindertest" %>

 using system;
 using system.web;

 using happy.web;

 public class jsonbindertest : ihttphandler, iwantautobindproperty
 {
     [autobind]
     public user user { get; set; }

     public void processrequest(httpcontext context)
     {
         context.response.contenttype = "text/plain";
         context.response.write(string.format("姓名：{0}，年龄：{1}", user.name, user.age));
     }

     public bool isreusable
     {
         get
         {
             return false;
         }
     }
 }

 public class user
 {
     public string name { get; set; }

     public int age { get; set; }
 }

运行结果

自动绑定到mvc
框架支持

using system;
 using system.collections.generic;
 using system.linq;
 using system.text;
 using system.threading.tasks;

 using system.web.mvc;

 using newtonsoft.json;

 namespace tenoner.web.mvc
 {
     public class jsonbinder : imodelbinder
     {
         public object bindmodel(controllercontext controllercontext, modelbindingcontext bindingcontext)
         {
             string json = controllercontext.httpcontext.request[bindingcontext.modelname];

             return jsonconvert.deserializeobject(json, bindingcontext.modeltype);
         }
     }
 }