Cache浏览器

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对Cache进行浏览并管理。例子

<%@ Page Language="C#" EnableViewState = "true"%>
<%@ import Namespace="System" %>
<%@ import Namespace="System.Configuration" %>
<%@ import Namespace="System.Collections" %>
<%@ import Namespace="System.Collections.Specialized" %>
<%@ import Namespace="System.Data" %>
<script runat="server">
//http://aspalliance.com/aldotnet/examples/cacheviewer.aspx
//http://scottwater.com
private void Page_Load(object sender, System.EventArgs e)
{
 if(!IsPostBack)
 {
  hlRefresh.NavigateUrl = Request.RawUrl;
  BindGrid();
 }
}

//绑定到DataGrid
private void BindGrid()
{
 //创建arraylist来保存cacheditem信息
 ArrayList al = new ArrayList();
 IDictionaryEnumerator CacheEnum = Cache.GetEnumerator();
 while (CacheEnum.MoveNext())
 {
  al.Add(new CachedItem(CacheEnum.Key.ToString(),CacheEnum.Value.GetType().ToString()));
 }
 litCount.Text = al.Count.ToString();
 dgCachedItems.DataSource = al;
 dgCachedItems.DataBind();
}

//删除Cache项
protected void Grid_ItemCommand(object sender, DataGridCommandEventArgs e)
{
 HyperLink l = (HyperLink)e.Item.FindControl("CacheItemName");
 //确保我们找到了该项
 if(l != null)
 {
  Cache.Remove(l.Text);
 }
 this.BindGrid();
}

protected void Grid_Created(object sender, DataGridItemEventArgs e)
{
 if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
 {
  ((Literal)e.Item.FindControl("Counter")).Text = (e.Item.ItemIndex + 1).ToString();
 }
}
private class CachedItem

 public CachedItem(){} 
 public CachedItem(string key, string type)
 {
  this.CacheKey = key;
  this.CacheType = type;
 }
 
 private string _cacheKey;
 public string CacheKey
 {
  get {return this._cacheKey;}
  set {this._cacheKey = value;}
 }
 
 private string _cacheType;
 public string CacheType
 {
  get {return this._cacheType;}
  set {this._cacheType = value;}
 }
}

//Remove All
void lbRemoveAll_Click(object sender, EventArgs e)
{
 IDictionaryEnumerator CacheEnum = Cache.GetEnumerator();
 while (CacheEnum.MoveNext())
 {
  Cache.Remove(CacheEnum.Key.ToString());
 }
 BindGrid();
}

</script>
<html>
<head>
<title>Cache管理器</title>
<style>
 TD,A,P,SPAN {font-size:9pt;}
 .Header {background-color:#EDEDED;text-align:center;font-weight:bold;}
</style>
</head>
<body >
<form runat="server">
浏览、删除缓存
<br/>
数量:
<asp:Literal id="litCount" runat="server"></asp:Literal>
<br/>
<asp:LinkButton id="lbRemoveAll" onclick="lbRemoveAll_Click" runat="server">清除全部缓存项</asp:LinkButton>
<br/>
<asp:HyperLink id="hlRefresh" Text="刷新" Runat="server"></asp:HyperLink>
<br/><br/>
<asp:DataGrid id="dgCachedItems" runat="server" OnItemCommand="Grid_ItemCommand"
 AutoGenerateColumns="False" OnItemCreated="Grid_Created">
 <HeaderStyle CssClass="Header"></HeaderStyle>
 <Columns>
 <asp:TemplateColumn HeaderText="数量">
 <ItemTemplate>
  <asp:Literal id="Counter" runat="server" />
 </ItemTemplate>
 </asp:TemplateColumn>
 <asp:TemplateColumn HeaderText="键">
 <ItemTemplate>
 <asp:HyperLink id="CacheItemName" runat="server" Target="_blank"
  Text='<%# ((CachedItem)(Container.DataItem)).CacheKey %>'
  NavigateUrl = '<%# ((CachedItem)(Container.DataItem)).CacheKey %>'/>
 </ItemTemplate>
 </asp:TemplateColumn>
 <asp:TemplateColumn HeaderText="类型">
 <ItemTemplate>
  <asp:Literal id="CacheItemDataType" runat="server"
   text='<%# ((CachedItem)(Container.DataItem)).CacheType %>' />
 </ItemTemplate>
 </asp:TemplateColumn>
 <asp:TemplateColumn HeaderText="删除">
 <ItemTemplate>
 <asp:LinkButton ID="RemoveButton" Text="删除" CommandName="RemoveFromCache"
   runat="server" />
 </ItemTemplate>
 </asp:TemplateColumn>
 </Columns>
</asp:DataGrid>
</form>
</body>
</html>

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