（1）直接返回DataSet對(duì)象
特點(diǎn)：通常組件化的處理機(jī)制，不加任何修飾及處理；
優(yōu)點(diǎn)：代碼精減、易于處理，小數(shù)據(jù)量處理較快；
缺點(diǎn)：大數(shù)據(jù)量的傳遞處理慢，消耗網(wǎng)絡(luò)資源；
建議：當(dāng)應(yīng)用系統(tǒng)在內(nèi)網(wǎng)、專網(wǎng)（局域網(wǎng)）的應(yīng)用時(shí)，或外網(wǎng)（廣域網(wǎng)）且數(shù)據(jù)量在KB級(jí)時(shí)的應(yīng)用時(shí)，采用此種模式。
示例如下：
代碼
1 [WebMethod(Description = "直接返回 DataSet 對(duì)象。")]
2 public DataSet GetNorthwindDataSet()
3 {
4 string sql = "SELECT * FROM XT_TEXT";
5 SqlConnection conn = new SqlConnection("Server=60.28.25.58;DataBase=s168593;user id=s168593;password=h0y+FeC*;");
6 conn.Open();
7 SqlDataAdapter dataadapter = new SqlDataAdapter(sql, conn);
8 DataSet ds = new DataSet();
9 dataadapter.Fill(ds, "XT_TEXT");
10 conn.Close();
11 return ds;
12 }
13
客戶程序調(diào)用方法：
代碼
private void button1_Click(object sender, EventArgs e)
{
//com.dzbsoft.www是上面Web Service發(fā)布后的命名空間
com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();
DateTime dtBegin = DateTime.Now;
DataSet dataSet = ds.GetNorthwindDataSet();
this.label1.Text = string.Format("耗時(shí)：{0}", DateTime.Now - dtBegin);
binddata(dataSet);
}
（2） 返回DataSet對(duì)象用Binary序列化后的字節(jié)數(shù)組
特點(diǎn)：字節(jié)數(shù)組流的處理模式；
優(yōu)點(diǎn)：易于處理，可以中文內(nèi)容起到加密作用；
缺點(diǎn)：大數(shù)據(jù)量的傳遞處理慢，較消耗網(wǎng)絡(luò)資源；
代碼
[WebMethod(Description = "返回 DataSet 對(duì)象用 Binary 序列化后的字節(jié)數(shù)組。")]
public byte[] GetDataSetBytes()
{
DataSet dataSet = GetNorthwindDataSet();
BinaryFormatter ser = new BinaryFormatter();
MemoryStream ms = new MemoryStream();
ser.Serialize(ms, dataSet);
byte[] buffer = ms.ToArray();
return buffer;
}
示例如下：
客戶程序調(diào)用方法：
代碼
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("耗時(shí)：{0}", DateTime.Now - dtBegin) + " " + buffer.Length;
binddata(dataSet);
}
(3) 返回DataSetSurrogate對(duì)象用Binary序列化后的字節(jié)數(shù)組
特點(diǎn)：微軟提供的開源組件；
優(yōu)點(diǎn)：易于處理，可以中文內(nèi)容起到加密作用；
缺點(diǎn)：大數(shù)據(jù)量的傳遞處理慢，較消耗網(wǎng)絡(luò)資源；
示例如下：
代碼
1 [WebMethod(Description = "返回 DataSetSurrogate 對(duì)象用 Binary 序列化后的字節(jié)數(shù)組。")]
2 public byte[] GetDataSetSurrogateBytes()
3 {
4 DataSet dataSet = GetNorthwindDataSet();
5 DataSetSurrogate dss = new DataSetSurrogate(dataSet);
6 BinaryFormatter ser = new BinaryFormatter();
7 MemoryStream ms = new MemoryStream();
8 ser.Serialize(ms, dss);
9 byte[] buffer = ms.ToArray();
10 return buffer;
11 }
12
客戶程序調(diào)用方法：
代碼
1 private void button3_Click(object sender, EventArgs e)
2 {
3 com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();
4 DateTime dtBegin = DateTime.Now;
5 byte[] buffer = ds.GetDataSetSurrogateBytes();
6 BinaryFormatter ser = new BinaryFormatter();
7 DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
8 DataSet dataSet = dss.ConvertToDataSet();
9 this.label3.Text = string.Format("耗時(shí)：{0}", DateTime.Now - dtBegin) + " " + buffer.Length;
10 binddata(dataSet);
11 }
12
(4)返回DataSetSurrogate對(duì)象用Binary序列化并Zip壓縮后的字節(jié)數(shù)組
特點(diǎn)：對(duì)字節(jié)流數(shù)組進(jìn)行壓縮后傳遞；
優(yōu)點(diǎn)：當(dāng)數(shù)據(jù)量大時(shí)，性能提高效果明顯，壓縮比例大；
缺點(diǎn)：相比第三方組件，壓縮比例還有待提高；
建議：當(dāng)系統(tǒng)需要進(jìn)行大數(shù)據(jù)量網(wǎng)絡(luò)數(shù)據(jù)傳遞時(shí)，建議采用此種可靠、高效、免費(fèi)的方法。
示例如下：
代碼
[WebMethod(Description = "返回 DataSetSurrogate 對(duì)象用 Binary 序列化并 Zip 壓縮后的字節(jié)數(shù)組。")]
public byte[] GetDataSetSurrogateZipBytes()
{
DataSet dataSet = GetNorthwindDataSet();
DataSetSurrogate dss = new DataSetSurrogate(dataSet);
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)
{
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;
}
}
}
客戶程序調(diào)用方法：
代碼
1 private void button4_Click(object sender, EventArgs e)
2 {
3 com.dzbsoft.www.Service1 ds = new com.dzbsoft.www.Service1();
4 DateTime dtBegin = DateTime.Now;
5 byte[] zipBuffer = ds.GetDataSetSurrogateZipBytes();
6 byte[] buffer = UnZipClass.Decompress(zipBuffer);
7 BinaryFormatter ser = new BinaryFormatter();
8 DataSetSurrogate dss = ser.Deserialize(new MemoryStream(buffer)) as DataSetSurrogate;
9 DataSet dataSet = dss.ConvertToDataSet();
10 this.label4.Text = string.Format("耗時(shí)：{0}", DateTime.Now - dtBegin) + " " + zipBuffer.Length;
11 binddata(dataSet);
12 }
13
private void binddata(DataSet dataSet)
{
this.dataGridView1.DataSource = dataSet.Tables[0];
this.label5.Text = "共計(jì)：" + dataSet.Tables[0].Rows.Count + "條記錄";
}
代碼
1 客戶端UnZipClass程序
2 public static class UnZipClass
3 {
4 public static byte[] Decompress(byte[] data)
5 {
6 try
7 {
8 MemoryStream ms = new MemoryStream(data);
9 Stream zipStream = null;
10 zipStream = new GZipStream(ms, CompressionMode.Decompress);
11 byte[] dc_data = null;
12 dc_data = ExtractBytesFromStream(zipStream, data.Length);
13 return dc_data;
14 }
15 catch
16 {
17 return null;
18 }
19 }
20 public static byte[] ExtractBytesFromStream(Stream zipStream, int dataBlock)
21 {
22 byte[] data = null;
23 int totalBytesRead = 0;
24 try
25 {
26 while (true)
27 {
28 Array.Resize(ref data, totalBytesRead + dataBlock + 1);
29 int bytesRead = zipStream.Read(data, totalBytesRead, dataBlock);
30 if (bytesRead == 0)
31 {
32 break;
33 }
34 totalBytesRead += bytesRead;
35 }
36 Array.Resize(ref data, totalBytesRead);
37 return data;
38 }
39 catch
40 {
41 return null;
42 }
43 }
44 }
45
