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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 复制代码 代码如下: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Happy.Web { public interface IWantAutoBindProperty { } } 复制代码 代码如下: 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 { } } 复制代码 代码如下: 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 复制代码 代码如下: <?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> 复制代码 代码如下: /// <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) } }); 复制代码 代码如下: <%@ 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 复制代码 代码如下: 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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