Vs2005里面的,查詢12000條記錄,設(shè)置RemotingFormat?= SerializationFormat.Binary;
再序列化,通過WebService傳輸,客戶端接收,再反序列化,確實(shí)效果大大的優(yōu)于直接傳送DataSet,不僅網(wǎng)絡(luò)傳輸中如此,即使本機(jī),性能改善也非常明顯.

下面分別是WebService里面的方法和客戶端反序列化取DataSet的方法.
1. 服務(wù)器上面取數(shù)據(jù),填充數(shù)據(jù)集,轉(zhuǎn)換為二進(jìn)制格式.
?/**////?<summary>
????///?Method?for?users?data?query?with?binaryFormatter
????///?</summary>
????///?<param?name="err"></param>
????///?<returns></returns>
????public?byte[]?BinaryUserSelect(ref?string?err)
????{
????????ClearCommand();
????????m_commandStringBuilder.Append("SELECT?*?FROM?t_Users?;");
????????DataSet?dsResult?=?new?DataSet();
????????byte[]?bArrayResult?=?null;
????????try
????????{??????????????????????????????
????????????dsResult?=?SqlHelper.ExecuteDataset(m_currentConnectionString,?CommandType.Text,?m_commandStringBuilder.ToString());
????????????//?上面都是取數(shù)據(jù)的,無需關(guān)心.二進(jìn)制壓縮數(shù)據(jù)集是下面一小段
????????????dsResult.RemotingFormat?=?SerializationFormat.Binary;
????????????MemoryStream?ms?=?new?MemoryStream();
????????????IFormatter?bf?=?new?BinaryFormatter();
????????????bf.Serialize(ms,?dsResult);
????????????bArrayResult?=?ms.ToArray();
????????????ms.Close();
????????????//?
????????}
????????catch?(Exception?ee)
????????{
????????????err?=?ee.ToString();
????????}
????????return?bArrayResult;????????
????}
2. 通過WebService把byte[]格式的數(shù)據(jù)發(fā)送到客戶端,這里就是WebService自己的事情了,我們無需關(guān)心

3.客戶端接收到byte[]格式的數(shù)據(jù),對(duì)其進(jìn)行反序列化,得到數(shù)據(jù)集,進(jìn)行客戶端操作.

?/**////?<summary>
????????///?Get?user?data?with?Binary?format
????????///?</summary>
????????///?<returns></returns>
????????public?DataSet?GetBinaryUserData()
????????{
????????????string?err?=?"";
????????????byte[]?bUserData?=?svc.ByteArrayUserSelect(ref?err);
????????????if?(err?!=?"")
????????????{
????????????????MessageBox.Show(err);
????????????????err?=?"";
????????????????return?null;
????????????}
????????????//?反序列化的過程
????????????MemoryStream?ms?=?new?MemoryStream(bUserData);
????????????IFormatter?bf?=?new?BinaryFormatter();
????????????object?obj?=?bf.Deserialize(ms);
????????????DataSet?dsResult?=?(DataSet)obj;
????????????//
????????????ms.Close();
????????????return?dsResult;
????????}
同樣一臺(tái)機(jī)器,手工生成12000條數(shù)據(jù),在本地使用WebService分別讀取、傳輸并在客戶端顯示數(shù)據(jù)集和byte[]格式的數(shù)據(jù),前者平均時(shí)間2.3秒,后者平均時(shí)間為1.7秒,之間的差別僅在傳輸過程的格式,還有后者需要的序列化和反序列化的時(shí)間.本地WebService傳輸?shù)牟顒e尚且如此,通過網(wǎng)絡(luò)傳輸?shù)臅r(shí)間優(yōu)化自然會(huì)更明顯..

.net1.1下面微軟提供的DataSetSurrogate開發(fā)包下載地址:http://support.microsoft.com/default.aspx?scid=kb;en-us;829740?? DataSetSurrogate 在.net 2.0里自帶
在.net1.1下的實(shí)現(xiàn)方式實(shí)例如下
在這里，有兩種方式：可把序列化后的數(shù)據(jù)用文件形式保存在客戶端硬盤；也可用Byte[]方式傳回客戶端，以下是代碼。
web?service?端(文件形式)?

??[WebMethod(Description="循環(huán)獲取遠(yuǎn)程DATASET")]
??public?void?SurrogateReadTable(string?TableName)
??{
???//把DataSet通過Surrogate?Class?序列化成?Binary?Stream
??
???DataSet?ds;
???ds=SqlHelper.ExecuteDataset(cnn,CommandType.Text,"select?*?from?"+TableName);
???//實(shí)例化DataSetSurrogate,傳取出的DATASET到構(gòu)造函數(shù)里
???sds?=?new?DataSetSurrogate(ds);?
???//實(shí)例化二進(jìn)制流
???BinaryFormatter?bf=new?BinaryFormatter();
???StreamWriter?swDat;?
???//寫到本地一個(gè)文件里
???swDat?=?new?StreamWriter(@"c:\output_surrogate_dataset.dat");
???bf.Serialize(swDat.BaseStream,?sds);
???//這里可以知道序列化后的文件的大小
???long?size?=?swDat.BaseStream.Length;
???swDat.Close();
??
??}

客戶端?

private?void?button1_Click(object?sender,?System.EventArgs?e)
??{
???label1.Text=DateTime.Now.ToString();

???button1.Enabled=false;
???//反序列化Binary?Stream能通過Surrogate?Class轉(zhuǎn)換成?DataSet

???//從WEB?SERVICE上讀取方法
???svs.SurrogateRead("t_busdocbase");
???BinaryFormatter?bf=new?BinaryFormatter();
???StreamReader?swDat;?
???swDat?=?new?StreamReader(@"c:\output_surrogate_dataset.dat");
???object?o=bf.Deserialize(swDat.BaseStream);
??DataSet?ds;
???sds?=?(DataSetSurrogate)?o;
???ds?=?sds.ConvertToDataSet();
???dataGrid1.DataSource=ds.Tables[0];
???swDat.Close();
???}



web?service?端(Byte[]方式)

[WebMethod(Description="獲取業(yè)務(wù)資料遠(yuǎn)程DATASET")]
??????public?byte[]?SurrogateRead1()
??????{
???????DataSet?ds;
???????ds=SqlHelper.ExecuteDataset(cnn,CommandType.Text,"select?*?from?t_busdocbase");
???????sds?=?new?DataSetSurrogate(ds);?
???????MemoryStream?s=?new?MemoryStream();
???????BinaryFormatter?bf?=?new?BinaryFormatter();
???????bf.Serialize(s,sds);
?????
???????byte[]?e?=?s.ToArray();
???????return?e;?
??
??????}


客戶端???

private?void?button3_Click(object?sender,?System.EventArgs?e)
???{
????label1.Text=DateTime.Now.ToString();

????button3.Enabled=false;
????//*反序列化Binary?Stream能通過Surrogate?Class轉(zhuǎn)換成?DataSet*/

????//從WEB?SERVICE上讀取方法


?????byte?[]?bb=svs.SurrogateRead1();
?????MemoryStream?br=new?MemoryStream(bb);
?????BinaryFormatter?bf=new?BinaryFormatter();
?????object?o=bf.Deserialize(br);
?????sds?=?(DataSetSurrogate)?o;
?????ds?=?sds.ConvertToDataSet();?
?????dataGrid1.DataSource=ds.Tables[0];

?????br.Close();

????}

我個(gè)人覺得用byte[]方式會(huì)安全些，畢竟不用在客戶端產(chǎn)生文件，不用擔(dān)心數(shù)據(jù)的安全。



在2.0 中對(duì)數(shù)據(jù)集序列化和反序列化的方法進(jìn)行了一下簡(jiǎn)單的封裝，使其可以得到重用的效果.見下面的類DatFormatter.

通過GetBinaryFormatData方法可以轉(zhuǎn)換數(shù)據(jù)集為二進(jìn)制，在服務(wù)器端使用,轉(zhuǎn)換數(shù)據(jù)集格式。發(fā)送，客戶端接收，得到二進(jìn)制格式數(shù)據(jù)，使用RetrieveDataSet方法，反序列化，得到數(shù)據(jù)集，進(jìn)行客戶端操作。通過這些簡(jiǎn)單的操作(序列化和反序列化，將數(shù)據(jù)壓縮)，可以使數(shù)據(jù)集等體積龐大的對(duì)象在遠(yuǎn)程傳遞中的時(shí)間大大減少，并且可以減少網(wǎng)絡(luò)中斷等問題對(duì)程序的影響。


?1using?System;
?2using?System.IO;
?3using?System.Data;
?4using?System.Runtime.Serialization;
?5using?System.Runtime.Serialization.Formatters.Binary;
?6
?7namespace?Common
?8{
?9????public?class?DataFormatter
10????{
11????????private?DataFormatter()?{?}
12????????/**////?<summary>
13????????///?Serialize?the?Data?of?dataSet?to?binary?format
14????????///?</summary>
15????????///?<param?name="dsOriginal"></param>
16????????///?<returns></returns>
17????????static?public?byte[]?GetBinaryFormatData(DataSet?dsOriginal)
18????????{
19????????????byte[]?binaryDataResult?=?null;
20????????????MemoryStream?memStream?=?new?MemoryStream();
21????????????IFormatter?brFormatter?=?new?BinaryFormatter();
22????????????dsOriginal.RemotingFormat?=?SerializationFormat.Binary;
23
24????????????brFormatter.Serialize(memStream,?dsOriginal);
25????????????binaryDataResult?=?memStream.ToArray();
26????????????memStream.Close();
27????????????memStream.Dispose();
28????????????return?binaryDataResult;
29????????}
30????????/**////?<summary>
31????????///?Retrieve?dataSet?from?data?of?binary?format
32????????///?</summary>
33????????///?<param?name="binaryData"></param>
34????????///?<returns></returns>
35????????static?public?DataSet?RetrieveDataSet(byte[]?binaryData)
36????????{?
37????????????DataSet?dataSetResult?=?null;
38????????????MemoryStream?memStream?=?new?MemoryStream(binaryData);
39????????????IFormatter?brFormatter?=?new?BinaryFormatter();
40
41????????????object?obj?=?brFormatter.Deserialize(memStream);
42????????????dataSetResult?=?(DataSet)obj;
43????????????return?dataSetResult;
44????????}
45????}
46}
47

轉(zhuǎn)載于:https://www.cnblogs.com/ghd258/archive/2005/12/06/291653.html

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