VS2013开发asmx接口根据ID查询对象

代码如下

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Xml;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
namespace WebServiceTest
{
    /// <summary>
    /// Test 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消注释以下行。
    // [System.Web.Script.Services.ScriptService]
    public class Test : System.Web.Services.WebService
    {

        [WebMethod]
        public int Test1(int a,int b)
        {
            return a+b;
        }
        [WebMethod]
        public int Test2(int a, int b)
        {
            return a - b;
        }
        [WebMethod]
        public XmlDocument Test3(int a, int b)
        {
         string xmlstr = "<nm values='" + a + "' date='2014-1-2' count='14' page='" + b + "'>"
          + "<domain>张三</domain>"
          + "<domain>张三</domain>"
          + "<domain>张三</domain>"
          + "<domain>张三</domain>"

          + "</nm>";
            //关键
            XmlDocument XmlDoc = new XmlDocument();
            XmlDoc.LoadXml(xmlstr);
            return XmlDoc;
        }
        [WebMethod]
        public XmlDocument GetStudentById(int a)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = "server=.;database=Test;uid=sa;pwd=sa";
            con.Open();
            //创建数据库命令
                SqlCommand cmd = con.CreateCommand();
                //创建查询语句
                cmd.CommandText = "SELECT * FROM stu_test where stu_id="+a;
                //从数据库中读取数据流存入reader中
                SqlDataReader reader = cmd.ExecuteReader();
                //从reader中读取下一行数据,如果没有数据,reader.Read()返回flase
                Hashtable ht = new Hashtable();
                while (reader.Read())
                {
                    //reader.GetOrdinal("id")是得到ID所在列的index,
                    //reader.GetInt32(int n)这是将第n列的数据以Int32的格式返回
                    //reader.GetString(int n)这是将第n列的数据以string 格式返回
                    int stu_id = reader.GetInt32(reader.GetOrdinal("stu_id"));
                    string stu_name = reader.GetString(reader.GetOrdinal("stu_name"));
                    int stu_age = reader.GetInt32(reader.GetOrdinal("stu_age"));
                    string stu_class= reader.GetString(reader.GetOrdinal("stu_class"));
                    //格式输出数据  

                    ht.Add("stu_id",stu_id);
                    ht.Add("stu_name", stu_name);
                    ht.Add("stu_age", stu_age);
                    ht.Add("stu_class", stu_class);
                }

                Object stu_id1 = ht["stu_id"].ToString();
                Object stu_name1 = ht["stu_name"].ToString();
                Object stu_age1 =  ht["stu_age"].ToString();
                Object stu_class1 = ht["stu_class"].ToString();
            string xmlstr = "<student stu_id='" + a + "' date='2014-1-2'>"

             + "<stu_name>" + stu_name1 + "</stu_name>"
             + "<stu_age>" + stu_age1 + "</stu_age>"
             + "<stu_class>" + stu_class1 + "</stu_class>"
             + "</student>";
            //关键
            XmlDocument XmlDoc = new XmlDocument();
            XmlDoc.LoadXml(xmlstr);
            return XmlDoc;
        }
    }
}

测试

结果如下图