如何在app_code中存取session及cache

如果我們使用Visual Studio 2008的檔案系統的ASP.NET專案時,時常會把共用程式寫在App_code下的類別中,但是一旦我們想在app_code中的class去存取ASP.NET的session或application,cache等物件時會找不到該物件,此時我們可以使用HttpContext.Current取得目前Http Request參考,就可以在App_code取得ASP.NET下的 Session, Application, Request, Response, Cache等常用物件了,例如以下範例:

   1: Public Class Class1

   2:     Dim session As HttpSessionState = HttpContext.Current.Session

   3:     Public Sub AddSession(ByVal key As String, ByVal value As Object)

   4:         session(key) = value

   5:     End Sub

   6:  

   7:     Public Function ReadSession(ByVal key As String) As Object

   8:         Return session(key)

   9:     End Function

  10: End Class