關(guān)于把a(bǔ)sp.net中ViewState 移動到頁面底部的好處，這個都不需要說了。
1.更容易被搜索引擎收錄。
2.頁面速度好像也有所提高.
但當(dāng)頁面又GridView 排序和分頁將出現(xiàn)問題。？？？？
思考中。
看看有沒有什么辦法可以解決！
關(guān)于asp.net怎么把ViewState移動頁面底部，給段代碼大家參考。
1.新建個
HttpModule 代碼如下。
2.//在web.config插入下面?modules
?? <httpModules>
??????? <add?name="ViewstateModule"?type="blogjava.Net.ViewstateModule"?/>
???? </httpModules>
? </system.web>
他的原理就是在請求是aspx頁面得時候，的到請求得數(shù)據(jù)(網(wǎng)頁得源代碼)再根據(jù)網(wǎng)頁源代碼用字符串查找方式查找"input?type=\"hidden\"?name=\"__VIEWSTATE\ 再把他移動到底部。看覆蓋得Write 方法就一目了然了。
#region?Using
using?System;
using?System.IO;
using?System.Web;
using?System.Text;
using?System.Text.RegularExpressions;
using?System.Web.UI;
#endregion
namespace Blogjava.Net
{
????///?<summary>
????///?Removes?whitespace?from?the?webpage.
????///?</summary>
????public?class?ViewstateModule?:?IHttpModule
????{
????????#region?IHttpModule?Members
????????void?IHttpModule.Dispose()
????????{
????????????//?Nothing?to?dispose;?
????????}
????????void?IHttpModule.Init(HttpApplication?context)
????????{
????????????context.BeginRequest?+=?new?EventHandler(context_BeginRequest);
????????}
????????#endregion
????????void?context_BeginRequest(object?sender,?EventArgs?e)
????????{
????????????HttpApplication?app?=?sender?as?HttpApplication;
??????????
????????????????if?(app.Request.Url.OriginalString.Contains(".aspx"))
????????????????{
????????????????????app.Response.Filter?=?new?ViewstateFilter(app.Response.Filter);
????????????????}
????????}
????????#region?Stream?filter
????????private?class?ViewstateFilter?:?Stream
????????{
????????????public?ViewstateFilter(Stream?sink)
????????????{
????????????????_sink?=?sink;
????????????}
????????????private?Stream?_sink;
????????????#region?Properites
????????????public?override?bool?CanRead
????????????{
????????????????get?{?return?true;?}
????????????}
????????????public?override?bool?CanSeek
????????????{
????????????????get?{?return?true;?}
????????????}
????????????public?override?bool?CanWrite
????????????{
????????????????get?{?return?true;?}
????????????}
????????????public?override?void?Flush()
????????????{
????????????????_sink.Flush();
????????????}
????????????public?override?long?Length
????????????{
????????????????get?{?return?0;?}
????????????}
????????????private?long?_position;
????????????public?override?long?Position
????????????{
????????????????get?{?return?_position;?}
????????????????set?{?_position?=?value;?}
????????????}
????????????#endregion
????????????#region?Methods
????????????public?override?int?Read(byte[]?buffer,?int?offset,?int?count)
????????????{
????????????????return?_sink.Read(buffer,?offset,?count);
????????????}
????????????public?override?long?Seek(long?offset,?SeekOrigin?origin)
????????????{
????????????????return?_sink.Seek(offset,?origin);
????????????}
????????????public?override?void?SetLength(long?value)
????????????{
????????????????_sink.SetLength(value);
????????????}
????????????public?override?void?Close()
????????????{
????????????????_sink.Close();
????????????}
????????????public?override?void?Write(byte[]?buffer,?int?offset,?int?count)
????????????{
????????????????byte[]?data?=?new?byte[count];
????????????????Buffer.BlockCopy(buffer,?offset,?data,?0,?count);
????????????????string?html?=?System.Text.Encoding.Default.GetString(buffer);
????????????????int?startPoint?=?html.IndexOf("<input?type=\"hidden\"?name=\"__VIEWSTATE\"");
????????????????if?(startPoint?>=?0)
????????????????{
????????????????????int?endPoint?=?html.IndexOf("/>",?startPoint)?+?2;
????????????????????string?viewstateInput?=?html.Substring(startPoint,?endPoint?-?startPoint);
????????????????????html?=?html.Remove(startPoint,?endPoint?-?startPoint);
????????????????????int?formEndStart?=?html.IndexOf("</form>")?-?1;
????????????????????if?(formEndStart?>=?0)
????????????????????{
????????????????????????html?=?html.Insert(formEndStart,?viewstateInput);
????????????????????}
????????????????}
????????????????byte[]?outdata?=?System.Text.Encoding.Default.GetBytes(html);
????????????????_sink.Write(outdata,?0,?outdata.GetLength(0));
????????????}
????????????#endregion
????????}
????????#endregion
????}
}
?參考:
http://www.hanselman.com/blog/ZippingCompressingViewStateInASPNET.aspx//end