web Service dataset压缩传输

浏览数：297 / 时间：2015年06月09日

服务端：

using System;

using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO.Compression;
using System.Data;
using CompressDataSet;


[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 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 Service : System.Web.Services.WebService
{
    public klmywgSoapHeader header = new klmywgSoapHeader();
    public Service () {

        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    [SoapHeader("header")]
    public string HelloWorld() {
       string result= header.Validate();
       if (result == "true")
       {
           return "Hello World";
       }
       else
           return result;
    }
    private DataSet GetDataSet()
    {
        DataSet ds = new DataSet();
        DataTable dt = new DataTable();
        ds.Tables.Add(dt);
        dt.Columns.Add("UserName", typeof(string));
        DataRow dr = dt.NewRow();
        dr["UserName"] = "UserName";
        dt.Rows.Add(dr);
        return ds;
    }

    [WebMethod(Description = "直接返回DataSetSurrogate对象，并用Binary序列化后并且ZIP压缩的字节数组")]
    public byte[] GetDataSetSurrogateZipBytes()
    {
        DataSet ds = GetDataSet();
        DataSetSurrogate dss = new DataSetSurrogate(ds);
        BinaryFormatter ser = new BinaryFormatter();  //序列化对象  
        MemoryStream ms = new MemoryStream();  //内存流  
        ser.Serialize(ms, dss);
        byte[] buffer = ms.ToArray();    //字节流  
        byte[] bufferZip = ComPress(buffer);
        return bufferZip ; }
 //压缩方法 

 public byte[] ComPress(byte[] data) { try { 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; } catch { return null; } } }

客户端：

using System.IO;
using System.IO.Compression;

       byte[] zipBuffer = service.GetDataSetSurrogateZipBytes();
        byte[] buffer = UnZipClass.Decompress(zipBuffer);
        BinaryFormatter ser = new BinaryFormatter();
        DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
        DataSet dataSet = dss.ConvertToDataSet();

解压：UnZipClass.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.IO;
using System.IO.Compression;
using System.Runtime.Serialization.Formatters.Binary;

public static class UnZipClass
{
    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 = ExtractBytesFromStream(zipStream, data.Length);
            return dc_data;
        }
        catch
        {
            return null;
        }
    }
    public static byte[] ExtractBytesFromStream(Stream zipStream, int dataBlock)
    {
        byte[] data = null;
        int totalBytesRead = 0;
        try
        {
            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;
        }
    }
}