第一节：ExtJS调用WCF系列-----实现JSON传递

首先我们打开我们的VS 新建一个Asp.Net WebApplication Project，(不要给我说新建网站，我讨厌那个东东) 命名为ExtJSAndWCFChapter1 如图：

接下来我们在该项目中新建一个实体类文件和一个AJAX—Enabled WCF SERVICE，分别命名为Employee.cs 和EmployeeService.svc

下面去ExtJS.Com网站下载一个ExtJS 2.0 ，解压缩后拷贝至Default.aspx相同目录下，并包括在项目中。如图：

下面开始编写代码：先编写Employee.cs的代码，代码如下：

using  System;
using  System.Data;
using  System.Configuration;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.HtmlControls;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Xml.Linq;
using  System.Runtime.Serialization;

namespace  ExtJSAndWCFChapter1
{
    [DataContract]
    public class Employee
    {
            [DataMember]
            public Guid EmployeeID { set; get; }
            [DataMember]
            public string CnName { set; get; }
            [DataMember]
            public bool Sex { set; get; }
            [DataMember]
            public int Age { set; get; }
            [DataMember]
            public DateTime Birthday { set; get; }
            [DataMember]
            public string Email { set; get; }
        
    }
}

接下来编写EmployeeService.cs的代码，代码如下：

using  System;
using  System.Linq;
using  System.Runtime.Serialization;
using  System.ServiceModel;
using  System.ServiceModel.Activation;
using  System.ServiceModel.Web;
using  System.Collections.Generic;

namespace  ExtJSAndWCFChapter1
{
    [ServiceContract(Namespace = "")]
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class EmployeeService
    {
        // Add [WebGet] attribute to use HTTP GET
        [OperationContract]
        public void DoWork()
        {
            // Add your operation implementation here
            return;
        }

        // Add more operations here and mark them with [OperationContract]
        /**//// <summary>
        /// 创建一个实体，实体由客户端传递
        /// </summary>
        /// <param name="emp"></param>
        /// <returns></returns>
        [OperationContract]
        [WebInvoke(BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/Create")]  
        public Guid Create(Employee emp)
        {
            NotNull(emp.CnName, "CnName");
            return Guid.NewGuid();
        }

        /**//// <summary>
        /// 获取一个实体
        /// </summary>
        /// <param name="id"></param>
        /// <returns></returns>
        [OperationContract]
        [WebInvoke(BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/Get")]
        public Employee Get(int id)
        {
            if (id != 1) throw new ArgumentException("Expected 1 for ID");
            return new Employee() { EmployeeID = Guid.NewGuid(), CnName = "Xiaozhuang", Sex = true, Age = 28, Email = "iamxiaozhuang@163.com", Birthday = new DateTime(1979, 02, 02) };
        }

        /**//// <summary>
        /// 获取所有实体
        /// </summary>
        /// <returns></returns>
        [OperationContract]
        [WebInvoke(BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/GetAll")]
        public List<Employee> GetAll()
        {
            return new List<Employee>
            {
                new Employee(){EmployeeID = Guid.NewGuid(),CnName="CnName",Sex=true,Age=28,Email="email@saf.com",Birthday=new DateTime(1979,02,02)},
                new Employee(){EmployeeID = Guid.NewGuid(),CnName="CnName1",Sex=false,Age=28,Email="email1@saf.com",Birthday=new DateTime(1979,02,02)}
            };
        }

        /**//// <summary>
        /// 获取num个实体
        /// </summary>
        /// <param name="num"></param>
        /// <returns></returns>
        [OperationContract]
        [WebInvoke(BodyStyle = WebMessageBodyStyle.Bare, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/GetByNum")]
        public List<Employee> GetByNum(int num)
        {
            if (num.ToString() == "") throw new ArgumentException("参数错误！");
            List<Employee> emplist = new List<Employee>();
            for (int i = 1; i <= num; i++)
            {
                Employee emp = new Employee() { EmployeeID = Guid.NewGuid(), CnName = i + "CnName", Sex = true, Age = i * 10, Email = i + "email@163.com", Birthday = new DateTime(1979, 02, 02) };
                emplist.Add(emp);
            }
            return emplist;
        }

        private static void NotNull<T>(T o, string paramName) where T : class
        {
            if (o == null) throw new ArgumentNullException(paramName);
        }
    }
}

主要就是这一句        [WebInvoke(BodyStyle = WebMessageBodyStyle.Wrapped, RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, UriTemplate = "/Create")] 
意思就是说这个方法传递输入和输出参数都是Json形式，并且可以用后面加Create的形式来访问该方法，至于前面那个BodyStyle = WebMessageBodyStyle.Wrapped是什么意思留着下节详细说明

接下来修改Web.Config文件，其实只是是把<enableWebScript /> 替换为<webHttp/>代码如下(一部分)

< system.serviceModel >
         < behaviors >
             < endpointBehaviors >
                 < behavior name = " ExtJSAndWCFChapter1.EmployeeServiceAspNetAjaxBehavior " >
                     <!--< enableWebScript  />-->
                     < webHttp />
                 </ behavior >
             </ endpointBehaviors >
         </ behaviors >
         < serviceHostingEnvironment aspNetCompatibilityEnabled = " true " />
         < services >
             < service name = " ExtJSAndWCFChapter1.EmployeeService " >
                 < endpoint address = ""  behaviorConfiguration = " ExtJSAndWCFChapter1.EmployeeServiceAspNetAjaxBehavior "  binding = " webHttpBinding "  contract = " ExtJSAndWCFChapter1.EmployeeService " />
             </ service >
         </ services >
     </ system.serviceModel >

现在可以编译并访问那个EmployeeService.svc文件，后面加上 UriTemplate的值：例如http://localhost:1481/EmployeeService.svc/get。会得到“Method not allowed”的提示。如果访问出现错误，请确认修改的Web.Config是否正确。
接下来编写Default.aspx的代码：代码如下

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeBehind = " Default.aspx.cs "  Inherits = " ExtJSAndWCFChapter1._Default "   %>

<! DOCTYPE html PUBLIC  " -//W3C//DTD XHTML 1.0 Transitional//EN "   " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >

< html xmlns = " http://www.w3.org/1999/xhtml "   >
< head runat = " server " >
     < title > Untitled Page </ title >
     < link rel = " stylesheet "  type = " text/css "  href = " ExtJS/resources/css/ext-all.css "   />
     <!--  GC  -->
     <!--  LIBS  -->

     < script type = " text/javascript "  src = " ExtJS/adapter/ext/ext-base.js " ></ script >

     < script type = " text/javascript "  src = " ExtJS/ext-all-debug.js " ></ script >
     < script type = " text/javascript "  src = " ExtJS/ext-all.js " ></ script >

     <!--  ENDLIBS  -->

     < script type = " text/javascript "  language = " javascript " >
     Ext.onReady(function()  {  
     //设置Content-Type为application/json形式
     Ext.lib.Ajax.defaultPostHeader = 'application/json';
     //访问失败的统一回调函数
     var onFailure = function(r, opts)
     {
      Ext.get("errors").insertHtml('afterend', '<br/><br/>' + r.responseText, false);  
    }
    //客户端创建一个实体
    var request={
    emp:{     CnName:'xiaozhuang',
              Sex:1,
              Age:28,
              Birthday:'/Date(62831853071)/',
              Email:'Iamxiaozhuang@hotmail.com'
    }
    }
    Ext.Ajax.request({  
    url: '/EmployeeService.svc/Create',//要访问的方法地址
     method: 'POST', 
     params: Ext.util.JSON.encode(request), //把输入参数进行JSON编码
     success: function(response, options) { Ext.get('create-p').update(response.responseText);  }, //输出方法返回结果
     failure: onFailure 
     });
     Ext.Ajax.request({ 
     url: '/EmployeeService.svc/Get', 
     method: 'POST', 
     params: Ext.util.JSON.encode(1),
     success: function(response, options) { Ext.get('get-p').update(response.responseText); }, 
     failure: onFailure 
     });
     Ext.Ajax.request({ 
     url: 'EmployeeService.svc/GetAll', 
     method: 'POST',  
     success: function(response, options) { Ext.get('getall-p').update(response.responseText);}, 
     failure: onFailure 
     }); 
     Ext.Ajax.request({ 
     url: 'EmployeeService.svc/GetByNum', 
     method: 'POST',  
     params: Ext.util.JSON.encode(8),
     success: function(response, options) { Ext.get('GetByNum-p').update(response.responseText);}, 
     failure: onFailure 
     }); 
     } );
     </ script >
</ head >
< body >
     < form id = " form1 "  runat = " server " >
      < div >
         < h3 >
            Create: </ h3 >
         < p id = " create-p " >
         </ p >
         < h3 >
            Get: </ h3 >
         < p id = " get-p " >
         </ p >
         < h3 >
            GetAll: </ h3 >
         < p id = " getall-p " >
         </ p >
         < h3 >
            GetByNum: </ h3 >
         < p id = " GetByNum-p " >
         </ p >
         < p id = " errors " >
         </ p >
     </ div >
     </ form >
</ body >
</ html >

最终的运行效果：

源代码下载在这里