浅谈WebService返回数据效率对比

[WebMethod(Description =  " 直接返回DataSet对象 ")]  
      public DataSet GetDataSet()  
     {  
          string connStr = System.Configuration.ConfigurationManager.ConnectionStrings[ " conn "].ToString();  
         SqlConnection conn =  new SqlConnection(connStr);  
          string sql =  " select * from china_city ";  
         conn.Open();  
         SqlDataAdapter sda =  new SqlDataAdapter(sql, conn);  
         DataSet ds =  new DataSet( " China ");  
         sda.Fill(ds);  
         conn.Close();  
          return ds;  
     }  
   
     [WebMethod(Description =  " 直接返回DataSet对象，并用Binary序列化后的字节数组 ")]  
      public  byte[] GetDataSetBytes()  
     {  
         DataSet ds = GetDataSet();  
         BinaryFormatter ser =  new BinaryFormatter();   // 序列化对象  
         MemoryStream ms =  new MemoryStream();   // 内存流  
         ser.Serialize(ms, ds);  
          byte[] buffer = ms.ToArray();     // 字节流  
          return buffer;  
     }  
   
     [WebMethod(Description =  " 直接返回DataSetSurrogate对象，并用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();   // 序列化对象  
         MemoryStream ms =  new MemoryStream();   // 内存流  
         ser.Serialize(ms, dss);  
          byte[] buffer = ms.ToArray();     // 字节流  
          return buffer;  
   
     }  
   
     [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 buffer;  
     }  
      // 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;  
         }  
     }

private void button1_Click( object sender, EventArgs e) 
    { 
        com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();  // new出WebService对象 
        DateTime dtBegin = DateTime.Now; 
        DataSet dataSet = ds.GetNorthwindDataSet(); 
        this.label1.Text = string.Format( " 耗时：{0} ", DateTime.Now - dtBegin); 
        binddata(dataSet); 
    } 
    private void button2_Click( object sender, EventArgs e) 
    { 
        com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1(); 
        DateTime dtBegin = DateTime.Now; 
        byte[] buffer = ds.GetDataSetBytes(); 
        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; 
        binddata(dataSet); 
    } 
    private void button3_Click( object sender, EventArgs e) 
    { 
        com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1(); 
        DateTime dtBegin = DateTime.Now; 
        byte[] buffer = ds.GetDataSetSurrogateBytes(); 
        BinaryFormatter ser = new BinaryFormatter(); 
        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; 
        binddata(dataSet); 
    } 
    private void button4_Click( object sender, EventArgs e) 
    { 
        com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1(); 
        DateTime dtBegin = DateTime.Now; 
        byte[] zipBuffer = ds.GetDataSetSurrogateZipBytes(); 
        byte[] buffer = UnZipClass.Decompress(zipBuffer); 
        BinaryFormatter ser = new BinaryFormatter(); 
        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; 
        binddata(dataSet); 
    } 
    private void binddata(DataSet dataSet) 
    { 
        this.dataGridView1.DataSource = dataSet.Tables[ 0]; 
        this.label5.Text = " 共计： " + dataSet.Tables[ 0].Rows.Count + " 条记录 "; 
    }

客户端UnZipClass程序 
    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; 
            } 
        } 
    }