在asp.net页面中经常会出现一些ViewState的html标记,也许某些时候你会禁用ViewState,但是某些情况下你不得不使用它——因为它的便捷性,但是由于在默认情况下,ViewState的HTML标记总是在页面的最前面,而且都是一些没有意义的内容,一般的搜索引擎收录的时候 就会将这些无意义的字符串收录进去,这样就会严重影响你所制作的网页在搜索引擎的排名。有没有解决办法?答案是有的,可以将ViewState的Html标记移到底部,不影响性能,对搜索引擎更友好。这种方法就是重写页面的Render,将ViewState的Html标记移到底部。using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
//ViewState的Html标记的正则表达式
private static readonly Regex viewStateRegex = new Regex(@"(<input type=""hidden"" name=""__VIEWSTATE"" id=""__VIEWSTATE"" value=""[w+\/=]+"" />)", RegexOptions.Multiline | RegexOptions.Compiled);
//</form>标记的正则表达式
private static readonly Regex endFormRegex = new Regex(@"</form>", RegexOptions.Multiline | RegexOptions.Compiled); protected override void Render(HtmlTextWriter writer)
{
System.IO.StringWriter stringWriter = new System.IO.StringWriter();
HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
base.Render(htmlWriter); string html = stringWriter.ToString();
Match viewStateMatch = viewStateRegex.Match(html);
string viewStateString = viewStateMatch.Captures[0].Value;//找出ViewState的Html标记
html = html.Remove(viewStateMatch.Index, viewStateMatch.Length);//替换掉ViewState的html标记 Match endFormMath = endFormRegex.Match(html, viewStateMatch.Index);
html = html.Insert(endFormMath.Index, viewStateString);//将ViewState的Html标记插入到</form>标记之前
writer.Write(html); } protected void Page_Load(object sender, EventArgs e)
{ }
}
现在出现了一个问题:页面加载就出现这样的问题。不知道怎么解决,
string viewStateString = viewStateMatch.Captures[0].Value;//找出ViewState的Html标记
指定的参数已超出有效值的范围。
参数名: i所以请大家能帮忙下!万分感谢
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;
using System.Text;
public partial class _Default : System.Web.UI.Page
{
//ViewState的Html标记的正则表达式
private static readonly Regex viewStateRegex = new Regex(@"(<input type=""hidden"" name=""__VIEWSTATE"" id=""__VIEWSTATE"" value=""[w+\/=]+"" />)", RegexOptions.Multiline | RegexOptions.Compiled);
//</form>标记的正则表达式
private static readonly Regex endFormRegex = new Regex(@"</form>", RegexOptions.Multiline | RegexOptions.Compiled); protected override void Render(HtmlTextWriter writer)
{
System.IO.StringWriter stringWriter = new System.IO.StringWriter();
HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);
base.Render(htmlWriter); string html = stringWriter.ToString();
Match viewStateMatch = viewStateRegex.Match(html);
string viewStateString = viewStateMatch.Captures[0].Value;//找出ViewState的Html标记
html = html.Remove(viewStateMatch.Index, viewStateMatch.Length);//替换掉ViewState的html标记 Match endFormMath = endFormRegex.Match(html, viewStateMatch.Index);
html = html.Insert(endFormMath.Index, viewStateString);//将ViewState的Html标记插入到</form>标记之前
writer.Write(html); } protected void Page_Load(object sender, EventArgs e)
{ }
}
现在出现了一个问题:页面加载就出现这样的问题。不知道怎么解决,
string viewStateString = viewStateMatch.Captures[0].Value;//找出ViewState的Html标记
指定的参数已超出有效值的范围。
参数名: i所以请大家能帮忙下!万分感谢
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{
static private DirectoryInfo _Dir; private DirectoryInfo Dir
{
get
{
if (_Dir == null)
{
_Dir = new DirectoryInfo(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "App_Data"));
if (!_Dir.Exists)
_Dir.Create();
_Dir = new DirectoryInfo(Path.Combine(_Dir.FullName, "ViewState"));
if (!_Dir.Exists)
_Dir.Create();
}
return _Dir;
}
} protected override object LoadPageStateFromPersistenceMedium()
{
PageStatePersister ps = this.PageStatePersister;
ps.Load();
if (ps.ControlState != null)
ps.ControlState = 反序列化对象((string)ps.ControlState);
if (ps.ViewState != null)
ps.ViewState = 反序列化对象((string)ps.ViewState);
return new Pair(ps.ControlState, ps.ViewState);
} protected override void SavePageStateToPersistenceMedium(object state)
{
PageStatePersister ps = this.PageStatePersister;
if (state is Pair)
{
Pair pair = (Pair)state;
ps.ControlState = pair.First;
ps.ViewState = pair.Second;
}
else
{
ps.ViewState = state;
}
if (ps.ControlState != null)
ps.ControlState = 序列化对象(ps.ControlState);
if (ps.ViewState != null)
ps.ViewState = 序列化对象(ps.ViewState);
ps.Save();
} private object 反序列化对象(string stateID)
{
string stateStr = (string)Cache[stateID];
string file = Path.Combine(Dir.FullName, stateID);
if (stateStr == null)
stateStr = File.ReadAllText(file);
else
Cache.Remove(stateID);
return new ObjectStateFormatter().Deserialize(stateStr);
} private string 序列化对象(object obj)
{
string value = new ObjectStateFormatter().Serialize(obj);
string stateID = (DateTime.Now.Ticks + (long)value.GetHashCode()).ToString(); //产生离散的id号码
File.WriteAllText(Path.Combine(Dir.FullName, stateID), value);
Cache.Insert(stateID, value);
return stateID;
} protected override void OnUnload(EventArgs e)
{
base.OnUnload(e);
DateTime dt = DateTime.Now.AddHours(-2);
foreach (FileInfo fl in Dir.GetFiles())
if (fl.LastAccessTime < dt)
try
{
fl.Delete();
}
catch
{
}
}
}