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>

</behavior>

</endpointBehaviors>

</behaviors>

</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">

<title>Untitled Page</title>

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>

<div>

<h3>

Create:</h3>

</p>

<h3>

Get:</h3>

</p>

<h3>

GetAll:</h3>

</p>

<h3>

GetByNum:</h3>

</p>

</p>

</div>

</form>

</body>

</html>

最终的运行效果：

源代码下载在这里

posted on 2007-12-07 18:14 小庄阅读(12748) 评论(17) 编辑收藏举报