C# 之 提高WebService性能大数据量网络传输处理

1、直接返回DataSet对象

　　特点：通常组件化的处理机制，不加任何修饰及处理；

　　优点：代码精减、易于处理，小数据量处理较快；

　　缺点：大数据量的传递处理慢，消耗网络资源；

　　建议：当应用系统在内网、专网（局域网）的应用时，或外网（广域网）且数据量在KB级时的应用时，采用此种模式。

2、返回DataSet对象用Binary序列化后的字节数组

　　特点：字节数组流的处理模式；

　　优点：易于处理，可以中文内容起到加密作用；

　　缺点：大数据量的传递处理慢，较消耗网络资源；

　　建议：当系统需要进行较大数据交换时采用。

3、返回DataSetSurrogate对象用Binary序列化后的字节数组

　　特点：微软提供的开源组件；

　　优点：易于处理，可以中文内容起到加密作用；

　　缺点：大数据量的传递处理慢，较消耗网络资源；

　　建议：当系统需要传输中文数据或需要加密时采用此种方式

4、返回DataSetSurrogate对象用Binary序列化并Zip压缩后的字节数组

　　特点：对字节流数组进行压缩后传递；

　　优点：当数据量大时，性能提高效果明显，压缩比例大；

　　缺点：相比第三方组件，压缩比例还有待提高；

　　建议：当系统需要进行大数据量网络数据传递时，建议采用此种可靠、高效、免费的方法。

　　测试用例：SqlServer2000数据库，数据量大小40000行，字段数１０个，结果如下：

使用方法	用时(秒）	数据量(Byte)	大小 百分比(%)
直接返回DataSet	12.625	19629414	100%
返回二进制序列化后DataSet	9.712	12049645	61.38%
返回转化DataSetSurrogate的DataSet 并且二进制序列化后	7.943	5138990	26.18%
返回转化DataSetSurrogate的DataSet 并且二进制序列化后使用zip压缩	7.619	978033	4.98%

using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;

using System.IO;
using System.IO.Compression;
using System.Data.SqlClient;
using System.Runtime.Serialization.Formatters.Binary;

namespace DataSetWebService
{
    /// <summary>
    /// Service1 的摘要说明
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    public class DataSetService : System.Web.Services.WebService
    {

        [WebMethod(Description="直接返回DataSet对象")]
        public DataSet GetDataSet()
        {
            //http://www.dzbsoft.com  XT_TEXT
            string sql = "select * from XT_TEXT";
            SqlConnection conn = new SqlConnection("Server=60.28.25.58;DataBase=s168593;user id=s168593;password=h0y+FeC*;");
            conn.Open();
            SqlDataAdapter dataAd = new SqlDataAdapter(sql, conn);
            DataSet DS = new DataSet("XT_TEXT");
            dataAd.Fill(DS);
            conn.Close();
            return DS;
        }

        [WebMethod(Description = "返回DataSet对象用Binary序列化后的字节数组")]
        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对象用Binary序列化后的字节数组")]
        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对象用Binary序列化并ZIP压缩后的字节数组")]
        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;
        }

        public byte[] Compress(byte[] data)
        {
            MemoryStream ms = new MemoryStream();
            Stream zipStream = null;
            zipStream = new GZipStream(ms, CompressionMode.Compress, true);
            zipStream.Write(data, , data.Length);
            zipStream.Close();
            ms.Position = ;
            byte[] compressed_data = new byte[ms.Length];
            ms.Read(compressed_data, , int.Parse(ms.Length.ToString()));
            return compressed_data;
        }
    }
}

客户端调用:C/S

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.IO;
using System.IO.Compression;
using System.Data.SqlClient;
using System.Runtime.Serialization.Formatters.Binary;

namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void BindDataSet(DataSet DS)
        {
            this.dataGridView1.DataSource = DS.Tables[];
        }

        private void button1_Click(object sender, EventArgs e)
        {
            com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
            DateTime dtBegin = DateTime.Now;
            DataSet DS = ds.GetDataSet();
            this.label1.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin);
            BindDataSet(DS);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
            DateTime dtBegin = DateTime.Now;
            byte[] buffer = ds.GetDataSetBytes();
            DataSet DS = ds.GetDataSet();
            BinaryFormatter ser = new BinaryFormatter();
            DataSet dataset = ser.Deserialize(new MemoryStream(buffer)) as DataSet;
            this.label2.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin + "          " + buffer.Length.ToString());
            BindDataSet(DS);
        }

        private void button3_Click(object sender, EventArgs e)
        {
            com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
            DateTime dtBegin = DateTime.Now;
            byte[] buffer = ds.GetDataSetSurrogateBytes();
            BinaryFormatter ser = new BinaryFormatter();
            DataSet DS = ds.GetDataSet();
            DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
            DataSet dataset = dss.ConvertToDataSet();
            this.label3.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin + "          " + buffer.Length.ToString());
            BindDataSet(DS);
        }

        private void button4_Click(object sender, EventArgs e)
        {
            com.dzbsoft.www.DataSetService ds = new Test.com.dzbsoft.www.DataSetService();
            DateTime dtBegin = DateTime.Now;
            byte[] zipBuffer = ds.GetDataSetSurrogateZipBytes();
            byte[] buffer = UnZipClass.Decompress(zipBuffer);
            BinaryFormatter ser = new BinaryFormatter();
            DataSet DS = ds.GetDataSet();
            DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
            DataSet dataset = dss.ConvertToDataSet();
            this.label4.Text = string.Format("耗时：{0}", DateTime.Now - dtBegin + "          " + zipBuffer.Length.ToString());
            BindDataSet(DS);
        }

    }
}

UnZipClass.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.IO.Compression;

namespace Test
{
    public static class UnZipClass
    {
        /// <summary>
        /// Decompresses the specified data.
        /// </summary>
        /// <param name="data">The data.</param>
        /// <returns></returns>
        public static byte[] Decompress(byte[] data)
        {
            try
            {
                MemoryStream ms = new MemoryStream(data);
                Stream zipStream = null;
                zipStream = new GZipStream(ms, CompressionMode.Decompress);
                byte[] dc_data = null;
                dc_data = EtractBytesFormStream(zipStream, data.Length);
                return dc_data;
            }
            catch
            {
                return null;
            }
        }

        public static byte[] EtractBytesFormStream(Stream zipStream, int dataBlock)
        {
            try
            {
                byte[] data = null;
                int totalBytesRead = ;
                while (true)
                {
                    Array.Resize(ref data, totalBytesRead + dataBlock + );
                    int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);
                    if (bytesRead == )
                    {
                        break;
                    }
                    totalBytesRead += bytesRead;
                }
                Array.Resize(ref data, totalBytesRead);
                return data;
            }
            catch
            {
                return null;
            }
        }
    }
}