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()
 {
 }
 }
}

<?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; }
}

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);
 }
 }
}

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