服務(wù)器端控件帶來(lái)的好外我在這就不多說(shuō)了，但多過(guò)的使用服務(wù)器端件保存控件的狀態(tài)會(huì)帶來(lái)大量的viewstate的情況大家一定遇到過(guò)吧．過(guò)多的viewstate會(huì)很大程度上降低頁(yè)面的加載速度制成服務(wù)器端的性能下降．
以下是結(jié)合csharpziplib對(duì)viewstate進(jìn)行壓縮的方法．
msplus.web.ui.page 源碼：
using system;
using system.web.ui;
using system.io;
using icsharpcode.sharpziplib.zip.compression;
namespace msplus.web.ui
{
/**//// <summary>
/// 壓縮viewstate by mack.z （msplus）
/// </summary>
public class page : system.web.ui.page
{
protected override void savepagestatetopersistencemedium(object pviewstate)
{
losformatter mformat = new losformatter();
stringwriter mwriter = new stringwriter();
mformat.serialize(mwriter, pviewstate);
string mviewstatestr = mwriter.tostring();
byte[] pbytes = system.convert.frombase64string(mviewstatestr);
pbytes = compress(pbytes);
string vstatestr = system.convert.tobase64string(pbytes);
registerhiddenfield("__mspvstate", vstatestr);
}
protected override object loadpagestatefrompersistencemedium()
{
string vstate = this.request.form.get("__mspvstate");
byte[] pbytes = system.convert.frombase64string(vstate);
pbytes = decompress(pbytes);
losformatter mformat = new losformatter();
return mformat.deserialize(system.convert.tobase64string(pbytes));
}
public static byte[] compress(byte[] pbytes)
{
memorystream mmemory = new memorystream();
deflater mdeflater = new deflater(icsharpcode.sharpziplib.zip.compression.deflater.best_compression);
icsharpcode.sharpziplib.zip.compression.streams.deflateroutputstream mstream = new icsharpcode.sharpziplib.zip.compression.streams.deflateroutputstream(mmemory,mdeflater,131072);
mstream.write(pbytes,0,pbytes.length);
mstream.close();
return mmemory.toarray();
}
public static byte[] decompress(byte[] pbytes)
{
icsharpcode.sharpziplib.zip.compression.streams.inflaterinputstream mstream = new icsharpcode.sharpziplib.zip.compression.streams.inflaterinputstream(new memorystream(pbytes));
memorystream mmemory = new memorystream();
int32 msize;
byte[] mwritedata = new byte[4096];
while(true)
{
msize = mstream.read(mwritedata, 0, mwritedata.length);
if (msize > 0)
{
mmemory.write(mwritedata, 0, msize);
}
else
{
break;
}
}
mstream.close();
return mmemory.toarray();
}
}
}
使用方法（aspx.cs頁(yè)面繼承msplus.web.ui.page）：public class pageclass : system.web.ui.page
測(cè)試下來(lái)的結(jié)果：壓縮后的viewstate只有原來(lái)的20%!
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我作了一個(gè)小小的測(cè)試.先后用同一個(gè)頁(yè)面加密和不加密的情況下,刷新頁(yè)面觀測(cè)w3wp.exe的cpu占用情況.此頁(yè)面的viewstate大小為3.996 bytes
w3wp.exe 以下是每次刷新的時(shí)cpu的情況
05 03 05 03 06 05 05 08 03 05 03 不加密，平均是 4.6
05 05 06 05 05 03 08 02 03 05 06 加密，平均是5.3
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