jQuery 调用WebService 实例讲解

1.首先建一个WebService程序

/// <summary>/// WebService1 的摘要说明/// </summary>[WebService(Namespace = "http://tempuri.org/")][WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)][ToolboxItem(false)]// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。[System.Web.Script.Services.ScriptService]public class WebService1 : System.Web.Services.WebService{ [WebMethod] public string HelloWorld() {  CommonData.Json.ObjectSerialization ser = new CommonData.Json.ObjectSerialization();  Student stu = new Student();  stu.Id = 1;  stu.Name = "hechen";  string json = ser.EntityToJson(stu);  return json; }}

　　[System.Web.Script.Services.ScriptService] 这里得注意，默认情况下这个特性是注释起来的，如果想用Javascript来调用WebService 就要取消这个注释

　　WebService 的内容不必多说，用Jquery调用WebService 返回肯定是一个xml。而xml是说明文件，而不是具体方法返回的值，所以我们做适当的处理。我们这里WebService方法返回的是JSON数据，以便在前台解析。下载是实体类序列化JSON的代码。

2. 实体对象序列化JSON

/** *  * 2009-5-26 * 贺  臣 *  * 将某个对象转化为Json数据格式 * */using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.IO;using System.Data;using System.ServiceModel.Web;using System.Runtime.Serialization;using System.Runtime.Serialization.Json;namespace CommonData.Json{ public class ObjectSerialization {  private object _entity;  /// <summary>  /// 被序列化得实体对象  /// </summary>  public object Entity  {   get { return _entity; }   set { _entity = value; }  }  private string _jsonData;  /// <summary>  /// 被转化为json格式数据的对象  /// </summary>  public string JsonData  {   get { return _jsonData; }   set { _jsonData = value; }  }  /// <summary>  /// 无参数构造方法  /// </summary>  public ObjectSerialization()  {   }  /// <summary>  /// 有参数构造方法  /// </summary>  /// <param name="entity">要被序列化得实体对象</param>  public ObjectSerialization(object entity)  {   this._entity = entity;  }  /// <summary>  /// 序列化实体对象  /// </summary>  /// <returns></returns>  public string EntityToJson()  {   var serializer = new DataContractJsonSerializer(Entity.GetType());   MemoryStream ms = new MemoryStream();   serializer.WriteObject(ms, Entity);   byte[] myByte = new byte[ms.Length];   ms.Position = 0;   ms.Read(myByte, 0, (int)ms.Length);   string dataString = Encoding.UTF8.GetString(myByte);   return dataString;  }  /// <summary>  /// 序列化实体对象  /// </summary>  /// <param name="entity">要被序列化得实体对象</param>  /// <returns></returns>  public string EntityToJson(object entity)  {   this._entity = entity;   return EntityToJson();  }  /// <summary>  /// 将Json格式数据转换为对象  /// </summary>  /// <returns></returns>  public T GetObjectJson<T>()  {   MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(JsonData));   var serializer = new DataContractJsonSerializer(typeof(T));   T t = (T)serializer.ReadObject(ms);   return t;  }  /// <summary>  /// 将Json格式数据转换为对象  /// </summary>  /// <param name="jsonData">json数据格式</param>  /// <returns></returns>  public T GetObjectJson<T>(string jsonData)  {   this._jsonData = jsonData;   return GetObjectJson<T>();  } }}