VisualStudio2010中创建ASP.Net WebService

相关资料：http://blog.csdn.net/yapingxin/article/details/7331375

具体操作：
1.打开“Microsoft Visual Studio 2010”->“文件”->“新建”->“项目”->“已安装的模板”－>“其他语言”->“Visual C#”->“Web”->“ASP.NET 空Web应用程序”。
2.“解决方案”->“MyDataService”工程右击->“增加”->“新建项”->“已安装的模版”->“Visual C#”->“Web”->“Web 服务”。

实例代码：

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Web.Services;
 using System.Web.Services.Protocols;
 using System.Data.OleDb;
 using System.Data;
 using System.IO;

 namespace MyDataService
 {
     /// <summary>
     /// WebService1 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，请取消对下行的注释。
     // [System.Web.Script.Services.ScriptService]
     public class WebService1 : System.Web.Services.WebService
     {

         [WebMethod]
         public string HelloWorld()
         {
             return "Hello World";
         }

          [WebMethod]
         public int Add(int x, int y)
        {
             return x + y;
         } 

         [WebMethod]
         public DataSet SelectSQL()
         {
             OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; data source=E:\\MyData.mdb");
             OleDbCommand cmd = new OleDbCommand("select * from usesr", con);
             OleDbDataAdapter oda = new OleDbDataAdapter();
             DataSet ds = new DataSet();
             DataTable dta = new DataTable();
             con.Open();
             oda = new OleDbDataAdapter(cmd);
             oda.Fill(ds, "usesr");
             return ds;
         }

         //
         [WebMethod]
         public string SelectSQL2()
         {
             OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; data source=E:\\MyData.mdb");
             OleDbCommand cmd = new OleDbCommand("select * from usesr", con);
             OleDbDataAdapter oda = new OleDbDataAdapter();
             DataSet ds = new DataSet();
             DataTable dta = new DataTable();
             con.Open();
             oda = new OleDbDataAdapter(cmd);
             oda.Fill(ds, "usesr");
             //
             System.Text.StringBuilder strbuilder = new System.Text.StringBuilder();
             StringWriter writer = new StringWriter(strbuilder);
             ds.WriteXml(writer, System.Data.XmlWriteMode.IgnoreSchema);

             return strbuilder.ToString();

         }
         [WebMethod]
         public string ExecSQL(string ASQL)
         {
             OleDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; data source=E:\\MyData.mdb");
             OleDbCommand cmd = new OleDbCommand(ASQL, con);
             con.Open();
             //
             int num = Convert.ToInt32(cmd.ExecuteNonQuery());
             if (num > )
             {
                 string Astr;
                 Astr = "成功";
                 return Astr;
             }
             else
             {
                 string Astr;
                 Astr = "失败";
                 return Astr;
             }
         }
     }
 }