Application对象问题

Question

我希望做出能在后台查看所有登陆用户信息的功能。在global.asax有这样一段：
void Application_Start(object sender, EventArgs e) 
{
   Application["hashTable"] = new Hashtable();
}
用户登陆过程中我有这样一段代码：string sessionId = this.Session.SessionID;
try
{
Application.Lock();
Hashtable sessionTable = Application["hashTable"] as Hashtable;
if (null == sessionTable)
{
   Application["hashTable"] = new Hashtable();
}
if (!sessionTable.Contains(sessionId))
{                       
   sessionTable.Add(sessionId, info);                       
}
Application.UnLock();
}
catch (Exception ex)
{
   throw new Exception("You have already login.");
}
我发现Application似乎不太稳定，我的Application并没有time out,但有时候Application中保存的Hashtable 会丢失一些用户信息，不知道这是怎么回事？  谢谢！

Answer 1

应用被IIS回收了！所以会丢数据！

Answer 2

var FONT_NAME = Array(
    Array('Arial', 'Arial'),
    Array('Arial Black', 'Arial Black'),
    Array('Times New Roman', 'Times New Roman'),
    Array('Courier New', 'Courier New'),
    Array('Tahoma', 'Tahoma'),
    Array('Verdana', 'Verdana'),
    Array('GulimChe', 'GulimChe'),
    Array('MS Gothic', 'MS Gothic')
);
//event handler
function execCmd()
{
 var cmd=window.event.srcElement.id;
 switch(cmd)
 {
   case "bold":
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("Bold",false,null);
   break;
   case "italic":
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("Italic",false,null);
   break;
   case "underLine":
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("Underline",false,null);
   break;
   case "fontName":
   DisplayFontNameMenu();
   break;
   case "Arial":
   document.frames("Editor").document.focus();
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("FontName",true,"Arial");
   break;
   case "Arial Black":
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("FontName",false,"Arial Black");
   break;
   case "Times New Roman":
   break;
   case "Courier New":
   break;
   case "Tahoma":
   var selectDocument=document.frames("Editor").document;
   selectDocument.execCommand("FontName",false,"Tahoma");
   break;
   case "Verdana":
   break;
   case "GulimChe":
   break;
   case "MS Gothic":
   break;
   default:
   break;
 }}
function DisplayFontNameMenu()
{
  var menu=document.getElementById("menu");
  if(menu.innerHTML!="")
  {
      menu.innerHTML="";
  }
  else
  {
     var htmlContent = "";
     for (var i = 0; i < FONT_NAME.length; i++)
     {
        htmlContent += "<div id='"
                       +FONT_NAME[i][0]
                       +"'style='font-family:" + FONT_NAME[i][0]
                       +";padding:2px;width:160px;cursor:pointer;' " 
                       +"onclick='execCmd();'"
                       +">"
                       +FONT_NAME[i][1]
                       + "</div>";
     }
     menu.innerHTML=htmlContent;
  }
}
function mouseover(el) {
el.className = "issueDetailToolbarButtonRaised";
}function mouseout(el) {
el.className = "issueDetailToolbarButton";
}function mousedown(el) {
el.className = "issueDetailToolbarButtonPressed";
}function mouseup(el) {
el.className = "issueDetailToolbarButtonRaised";
}//Creates a tool bar button for html editor
function createToolBarButton(icon, alt, cmd)
{
    var htmlContent="<img id='"
               +cmd
               +"'class='issueDetailToolbarButton'onmouseover='mouseover(this);'onmouseout='mouseout(this);'onmousedown='mousedown(this);'onmouseup='mouseup(this);'"
               + "onclick='execCmd();'"
               + "src='"+icon+"'"
               +"align='middle'"
               +"alt='"+alt+"'"
               +"/>"    return htmlContent;
}
//constructor
function htmlEditor(objName)
{ this.init=function()
 {
     var toolBar=document.getElementById("toolBar");
     var htmlContent=createToolBarButton("bold.gif", "click to make your selection bold", "bold");
     htmlContent+=createToolBarButton("italic.gif", "click to make your selection italic", "italic");
     htmlContent+=createToolBarButton("underLine.gif", "click to make your selection underLine", "underLine");
     htmlContent+=createToolBarButton("fontColor.gif", "click to make your selection color", "fontColor");
     htmlContent+=createToolBarButton("size.gif", "click to make your selection font size", "fontSize");
     htmlContent+=createToolBarButton("font.gif", "click to make your selection font name", "fontName");
     toolBar.innerHTML=htmlContent;
 }
}

Answer 3

<html>
<head>
<link href="view.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="htmlEditor.js"></script>
</head>
<body><form name="my_form">
<div style="width: 600px; height: 280px">
<div id="toolBar" style="background-color:#d0d0d0; width: 100%;height:8%;"></div>
<div id="menu"></div><IFRAME id="Editor" style="width:100%;height:92%"></IFRAME>
</div>
<SCRIPT language=javascript>
function initEdit(Editor)
{
   Editor.document.designMode="On";
}
initEdit(Editor);
var editorInit=new htmlEditor("aa");
editorInit.init();
</SCRIPT>
</form>
</body>
</html>

Answer 4

 /*------------------issue detail page-------------------*/
.issueDetailToolbarButton
{
  border-top: 1px solid #d0d0d0;
  border-left: 1px solid #d0d0d0;
  border-bottom: 1px solid #d0d0d0;
  border-right: 1px solid #d0d0d0;
}.issueDetailToolbarButtonRaised
{
border-top: 1px solid #0080FF;
border-left: 1px solid #0080FF;
border-bottom: 1px solid #0080FF;
border-right: 1px solid #0080FF;
background-color: #D2E9FF;
}.issueDetailToolbarButtonPressed
{
border-top: 1px solid #0080FF;
border-left: 1px solid #0080FF;
border-bottom: 1px solid #0080FF;
border-right: 1px solid #0080FF;
background-color: #D2E9FF;
}