{"id":1651,"date":"2013-10-22T18:08:03","date_gmt":"2013-10-22T18:08:03","guid":{"rendered":"http:\/\/galhano.com\/blog\/?p=1651"},"modified":"2013-10-22T19:38:16","modified_gmt":"2013-10-22T19:38:16","slug":"using-cache-in-asp-net","status":"publish","type":"post","link":"http:\/\/galhano.com\/blog\/?p=1651","title":{"rendered":"Using “Cache” in ASP.Net"},"content":{"rendered":"
\u00a0Data can be stored on the client – using the view state<\/strong> of the page, or on the server in a variable session state<\/strong> or application<\/strong>, or using the server cache<\/strong>.<\/div>\n
<\/div>\n
ASP.NET implements System.Web.Caching.Cache<\/strong><\/a> class to store objects that require a large amount of server resources to be created, so that they do not have to be recreated each time it is needed.<\/div>\n
<\/div>\n
You can access via code information about a class instance cache through the property cache<\/strong>, the object of the HttpContext<\/strong> or Page object<\/strong>.<\/div>\n
<\/div>\n
Expiration<\/strong> policy for items in cache:<\/div>\n
    \n
  • Specific time:\u00a0 absolute expiration<\/strong><\/span><\/li>\n
  • May also expire if not accessed for a period of time:\u00a0 sliding expiration<\/strong><\/span><\/li>\n<\/ul>\n

    <\/p>\n

    Insert Into cache<\/strong><\/p>\n

    [vb]
    \n Cache.Insert("myDataSet", ds, Nothing, DateTime.Now.AddSeconds(30), System.TimeSpan.Zero)
    \n[\/vb]<\/p>\n

    Using Cache:<\/strong><\/p>\n

    [vb]
    \nIf Cache("myDataSet") Is Nothing Then
    \n\tMyDataSet()
    \n\t‘DataSet from database
    \nElse
    \n\tds = CType(Cache("myDataSet"), DataSet)
    \n\t‘ DataSet from cache.
    \nEnd If
    \n[\/vb]<\/p>\n

    Clear Cache:<\/strong><\/p>\n

    [vb]
    \n Cache.Remove("myDataSet")
    \n[\/vb]<\/p>\n

    Clear ALL Cache vars:<\/strong><\/p>\n

    [vb]
    \n Dim enumerator As IDictionaryEnumerator = HttpContext.Current.Cache.GetEnumerator()
    \n While enumerator.MoveNext()
    \n HttpContext.Current.Cache.Remove(enumerator.Key)
    \n End While
    \n[\/vb]<\/p>\n

    Note that, this technique is not efficient for pages with OutputCache type. for clearing this type cached memory, you should use below code line.<\/p>\n

    [vb]
    \nHttpRuntime.Close()
    \n[\/vb]<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u00a0Data can be stored on the client – using the view state of the page, or on the server in a variable session state or application, or using the server cache. ASP.NET implements System.Web.Caching.Cache class to store objects that require a large amount of server resources to be created, so that they do not have […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"close","ping_status":"close","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-1651","post","type-post","status-publish","format-standard","hentry","category-aspnet","author-admin"],"_links":{"self":[{"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1651","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1651"}],"version-history":[{"count":12,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1651\/revisions"}],"predecessor-version":[{"id":1653,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1651\/revisions\/1653"}],"wp:attachment":[{"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1651"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/galhano.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}