Web Service 中返回DataSet結果的幾種方法

Web Service 中返回DataSet結果的幾種方法：

1)直接返回DataSet對象
    特點：通常組件化的處理機制，不加任何修飾及處理；
    優點：代碼精減、易於處理，小數據量處理較快；
    缺點：大數據量的傳遞處理慢，消耗網絡資源；
    建議：當應用系統在內網、專網（局域網）的應用時，或外網（廣域網）且數據量在KB級時的應用時，采用此種模式。

 

2)返回DataSet對象用Binary序列化后的字節數組
    特點：字節數組流的處理模式；
    優點：易於處理，可以中文內容起到加密作用；
    缺點：大數據量的傳遞處理慢，較消耗網絡資源；
    建議：當系統需要進行較大數據交換時采用。

 

3)返回DataSetSurrogate對象用Binary序列化后的字節數組
    特點：微軟提供的開源組件；下載地址： http://support.microsoft.com/kb/829740/zh-cn
    優點：易於處理，可以中文內容起到加密作用；
    缺點：大數據量的傳遞處理慢，較消耗網絡資源；
    建議：當系統需要進行較大數據交換時采用。

 

4)返回DataSetSurrogate對象用Binary序列化並Zip壓縮后的字節數組
    特點：對字節流數組進行壓縮后傳遞；
    優點：當數據量大時，性能提高效果明顯，壓縮比例大；
    缺點：相比第三方組件，壓縮比例還有待提高；
    建議：當系統需要進行大數據量網絡數據傳遞時，建議采用此種可靠、高效、免費的方法。

代碼示例:

服務端

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System.IO.Compression;

namespace DataSetWebService
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    public class DataSetService : System.Web.Services.WebService
    {
        string connectionString = "Server=.;DataBase=NORTHWIND;user id=sa;password=sa;";

        [WebMethod(Description = "直接返回DataSet對象")]
        public DataSet GetDataSet()
        {
            DataSet DS = new DataSet();
            string sql = "SELECT * FROM [Customers]";
            using (SqlConnection conn = new SqlConnection(connectionString))
            {
                conn.Open();
                SqlDataAdapter dataAd = new SqlDataAdapter(sql, conn);
               
                dataAd.Fill(DS);
            }
            return DS;
        }

        [WebMethod(Description = "返回DataSet對象用Binary序列化后的字節數組")]
        public byte[] GetDataSetBytes()
        {
            DataSet DS = GetDataSet();
            BinaryFormatter ser = new BinaryFormatter();
            MemoryStream ms = new MemoryStream();
            ser.Serialize(ms, DS);
            byte[] buffer = ms.ToArray();
            return buffer;
        }

        [WebMethod(Description = "返回DataSetSurrogate對象用Binary序列化后的字節數組")]
        public byte[] GetDataSetSurrogateBytes()
        {
            DataSet ds = GetDataSet();
            DataSetSurrogate dss = new DataSetSurrogate(ds);
            BinaryFormatter ser = new BinaryFormatter();
            MemoryStream ms = new MemoryStream();
            ser.Serialize(ms, dss);
            byte[] buffer = ms.ToArray();
            return buffer;
        }

        [WebMethod(Description = "返回DataSetSurrogate對象用Binary序列化后的字節數組")]
        public byte[] GetDataSetSurrogateZipBytes()
        {
            DataSet DS = GetDataSet();
            DataSetSurrogate dss = new DataSetSurrogate(DS);
            BinaryFormatter ser = new BinaryFormatter();
            MemoryStream ms = new MemoryStream();
            ser.Serialize(ms, dss);
            byte[] buffer = ms.ToArray();
            byte[] zipBuffer = Compress(buffer);
            return zipBuffer;
        }

        /// <summary>
        /// 壓縮二進制數據
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public byte[] Compress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            Stream zipStream = null;
            using (zipStream = new GZipStream(ms, CompressionMode.Compress, true))
            {
                zipStream.Write(data, 0, data.Length);              
                zipStream.Close();
            }
            ms.Position = 0;
            byte[] compressedData = new byte[ms.Length];
            ms.Read(compressedData, 0, int.Parse(ms.Length.ToString()));
            return compressedData;
        }
    }
}

客戶端：

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using System.IO.Compression;
using System.Runtime.Serialization.Formatters.Binary;

namespace Test
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        WService.DataSetServiceSoapClient _Ds = new WService.DataSetServiceSoapClient();

        private void BindDataSet(DataSet DS)
        {
            this.GridView1.DataSource = DS.Tables[0];
            this.GridView1.DataBind();
        }

        /// <summary>
        ///調用 直接返回DataSet對象
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button1_Click(object sender, EventArgs e)
        {
           DataSet ds= _Ds.GetDataSet();
           BindDataSet(ds);
        }

        /// <summary>
        /// 調用  返回DataSet對象用Binary序列化后的字節數組
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button2_Click(object sender, EventArgs e)
        {
            byte[] buffer = _Ds.GetDataSetBytes();
            BinaryFormatter bf = new BinaryFormatter();
            DataSet ds = bf.Deserialize(new MemoryStream(buffer)) as DataSet;
            BindDataSet(ds);
            Label2.Text = buffer.Length.ToString();
        }

        /// <summary>
        /// 調用  返回DataSetSurrogate對象用Binary序列化后的字節數組
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button3_Click(object sender, EventArgs e)
        {
            byte[] buffer = _Ds.GetDataSetSurrogateBytes();
            BinaryFormatter bf = new BinaryFormatter();
            DataSetSurrogate dss = bf.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
            DataSet ds = dss.ConvertToDataSet();
            BindDataSet(ds);
            Label3.Text = buffer.Length.ToString();
        }

        /// <summary>
        /// 調用  返回DataSetSurrogate對象用Binary序列化后的字節數組
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void Button4_Click(object sender, EventArgs e)
        {
            byte[] buffer = _Ds.GetDataSetSurrogateZipBytes();
            MemoryStream ms = new MemoryStream(buffer);
            Stream zipStream = new GZipStream(ms, CompressionMode.Decompress);
            byte[] dc_data = null;
            int totalBytesRead = 0;
            while (true)
            {
                Array.Resize(ref dc_data, totalBytesRead + buffer.Length + 1);
                int bytesRead = zipStream.Read(dc_data,totalBytesRead, buffer.Length);
                if (bytesRead == 0)
                {
                    break;
                }
                totalBytesRead += bytesRead;
            }
            BinaryFormatter bf = new BinaryFormatter();
            DataSetSurrogate dss = bf.Deserialize(new MemoryStream(dc_data)) as DataSetSurrogate;
            DataSet ds = dss.ConvertToDataSet();
            BindDataSet(ds);
            Label4.Text = buffer.Length.ToString();
        }
    }
}