WebService在NET中的应用（二）

在WebService在NET中的应用（一）对WebService进行了简单介绍，下面将对WebService性能大数据量网络传输处理进行总结，主要分为以下几个部分：

首先，新建一个解决方案，接着”添加“->”新建项目“

上图中，新建了一个”ASP.NET Web服务应用程序“项目，名称可以自己修改，确定后，查看解决方案资源管理器

打开DataSetService.asmx，查看代码

using System;using System.Collections.Generic;using System.Web;using System.Web.Services;namespace DataSetWebService{    /// <summary>    /// Service1 的摘要说明    /// </summary>    [WebService(Namespace = "http://tempuri.org/")]    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]    [System.ComponentModel.ToolboxItem(false)]    public class DataSetService : System.Web.Services.WebService    {        [WebMethod]        public string HelloWorld()        {            return "Hello World";        }    }}

一个简单的Web服务程序建立完成，里面有一个HelloWorld方法，接下来需要添加属于自己的方法

一、直接返回DataSet对象

[WebMethod(Description="直接返回DataSet对象")]        public DataSet GetDataSet()        {            string sql = "select * from 表";            SqlConnection conn = new SqlConnection("连接字符串");            conn.Open();            SqlDataAdapter dataAd = new SqlDataAdapter(sql, conn);            DataSet DS = new DataSet("表名");            dataAd.Fill(DS);            conn.Close();            return DS;        }

二、返回DataSet对象用Binary序列化后的字节数组

[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;        }

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

[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;        }

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

[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, 0, data.Length);            zipStream.Close();            ms.Position = 0;            byte[] compressed_data = new byte[ms.Length];            ms.Read(compressed_data, 0, int.Parse(ms.Length.ToString()));            return compressed_data;        }

一、二、三、四都是我们自己的方法，那么又该如何去调用WebService呢？这时候我们新建一个窗体程序，窗体程序建好后，添加Web引用

点击”此解决方案中的Web服务“，然后找到DataSetService，添加即可。

窗体后台

private void BindDataSet(DataSet DS)        {            this.dataGridView1.DataSource = DS.Tables[0];        }        private void button1_Click(object sender, EventArgs e)        {            DataSetService ds = new Test.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)        {            DataSetService ds = new Test.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)        {            DataSetService ds = new Test.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)        {            DataSetService ds = new Test.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);        }

button1_Click、button2_Click、button3_Click、button4_Click依次对应上面的一、二、三、四（4个方法），在第四个方法中进行了ZIP压缩，获取数据就要解压，解压类中的方法如下：

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 = 0;                while (true)                {                    Array.Resize(ref data, totalBytesRead + dataBlock + 1);                    int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);                    if (bytesRead == 0)                    {                        break;                    }                    totalBytesRead += bytesRead;                }                Array.Resize(ref data, totalBytesRead);                return data;            }            catch            {                return null;            }        }    }