Web Service 中返回DataSet结果的几种方法：
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；下载地址： http://support.microsoft.com/kb/829740/zh-cn
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。
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。
代码示例:
服务端
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对象")]
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;
} /// <summary>
/// 压缩二进制数据
/// </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, , data.Length);
zipStream.Close();
}
ms.Position = ;
byte[] compressedData = new byte[ms.Length];
ms.Read(compressedData, , int.Parse(ms.Length.ToString()));
return compressedData;
}
}
}
客户端：
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[];
this.GridView1.DataBind();
} /// <summary>
///调用 直接返回DataSet对象
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
{
DataSet ds= _Ds.GetDataSet();
BindDataSet(ds);
} /// <summary>
/// 调用 返回DataSet对象用Binary序列化后的字节数组
/// </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>
/// 调用 返回DataSetSurrogate对象用Binary序列化后的字节数组
/// </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>
/// 调用 返回DataSetSurrogate对象用Binary序列化后的字节数组
/// </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 = ;
while (true)
{
Array.Resize(ref dc_data, totalBytesRead + buffer.Length + );
int bytesRead = zipStream.Read(dc_data,totalBytesRead, buffer.Length);
if (bytesRead == )
{
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();
}
}
}
