??? ??? ????? ?? ASP.NET ???????? Visual Basic .NET

???? ??? ??????? ???? ????? ????? ?????? ?? ????? ASP.NET ?????? ????? ??? ?????? ????????. ?????? ??????? ???? ????? ????? ??????? ??? ????? ??????? ???????. ??????? ?????? ????? ???? ?????? ??????? ?????? ??????? ????? ????. ?? ??? ????? ?????? ????? ????? ?????? ???????? ?? ??????? ?? ????? ?? ?????? ?? ???????. ????? ????? ??? ??????? ??? ???? ??? ?? ??? ?????? ?????? ?? ??? ????????.

???? ASP.NET ?????? ?????? ?????? ?? ??????? ??????. ????? ??????? ??????? @ OutputCache ?????? ?? ??????? ?????? ?? ASP.NET ????? ??????. ?????? ????? HttpCachePolicy ?????? ??????? ????????? ??? datasets ??? ????? ??????. ????? ????? ????? ??????? ?????? ?? ??????? ??? ?????? ?????? ?????? ?????? ? ????? ??????? ?????? ?? Microsoft (IIS). ????? ?????? ?? ??????? ?????? ???????? ??? HTTP Cache - Control (?????? ?? ??????? ??????.

?????? ??? ??????? ?????? ??? ????? ??????? ?????? ??????? ?? ASP.NET ???? ??? ??? ??????? ?????? ?????? ?? "????? ??????? ?? Microsoft:

????? ASP.NET ????? ??????? ??????

???? ????? ???????? ??????? @ OutputCache ?? ??????? ???? ????????? ???????? ???????? Visual Basic .NET ?? Visual C# .NET. ????? OutputCache @ ????? ??? ??? ??????. ??? ????? ????? ???? ???? ????? ??????? ??????. ????? ????? ??? ??????? ???????:

• ?? - ??? ?????? ????? ??????? ??????? ??????? ?? ?????? ????????? ??? ?????? ?????? (?? ?? ????) ????? ?? ????? ?? ??? ?????? ??? ??? ?????? ?????. ?????????? ?? ?????.
• ?????? - ??? ?????? ????? ??????? ??????? ?????? ??? ?????? ??????.
• Downstream - ??? ?????? ????? ??????? ??????? ??????? ?? ??? ????? ????? ??? ????? ??????? ?????? (????? ?? ???? ?????) ???????? ?? ?????.
• ?????? - ??? ?????? ????? ??????? ??????? ?????? ??? ???? ???.
• ??? - ??? ???? ????? ??????? ??????? ???????.

???? ??? ????? ????????? ???????? ?? @ OutputCache ????? ???? ??????? ??????.

• ????? ????? ??????? ??????? ?????? ??? ???????
  
  ???? ????????:
  

  <%@ OutputCache Duration="60" VaryByParam="None" %>

  
  ???? ???????:
  

  Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
  Response.Cache.SetCacheability(HttpCacheability.Public)

• ????? ????? ??????? ??????? ?????? ??? ?????? ???????? ??? ?? ????? ?????
  
  ???? ????????:
  

  <%@ OutputCache Duration="60" Location="Client" VaryByParam="None" %>

  
  ???? ???????:
  

  Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
  Response.Cache.SetCacheability(HttpCacheability.Private)
  

• ????? ????? ??????? ??????? ?????? ??? ??? ????? ????? ??? ????? ??????? ?????? HTTP 1.1 ??? ?? ??? ???????? ??????? ?????? ???? ???? ???
  
  ???? ????????:
  

  <%@ OutputCache Duration="60" Location="Downstream" VaryByParam="None" %>

  
  ???? ???????:
  

  Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
  Response.Cache.SetCacheability(HttpCacheability.Public)
  Response.Cache.SetNoServerCaching()

• ????? ????? ??????? ??????? ?????? ??? ???? ???
  
  ???? ????????:
  

  <%@ OutputCache Duration="60" Location="Server" VaryByParam="None" %>

  
  ???? ???????:
  

  Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
  Response.Cache.SetCacheability(HttpCacheability.Server)
  

• ????? ??????? ?? ??? HTTP ???? ??? ?? ????? ??????
  
  ???? ????????:
  

  <%@ OutputCache duration="60" varybyparam="City" %>
  

  
  ???? ???????:
  

  Response.Cache.SetExpires(DateTime.Now.AddSeconds(60))
  Response.Cache.SetCacheability(HttpCacheability.Public)
  Response.Cache.VaryByParams("City") = true
  

  ??? VaryByCustom ? ??? VaryByHeader ? ??? ' VaryByParam ' ?? ??????? @ OutputCache ???? ????? HttpCachePolicy ??????? VaryByHeaders ? ??????? VaryByParams ????? SetVaryByCustom.

????? ????? ???? ??????? ??????? ??????

?????? ????? ????? ??????? ??????? ?????? ????? ??? ASP.NET ?? ???? ???? ??? ?????? ?????? ????? ???? ????? ?????? ??? ?? ?? ?? ?????? ???? VaryByParam ??? ??? ?? ????? OutputCache @. ??????? ????? ???????? ???????? ??????? ?????? ????? ???? ??????? ??????? ??????.

• ???? ????????:

  <%@ OutputCache Location="None" VaryByParam="None" %>

• ???? ???????:

  Response.Cache.SetCacheability(HttpCacheability.NoCache)

????? ??????? ?????? ?????? ?????? ?? ????? ??????

????? ASP.NET ???? ??????? ?????? ????? ? ???? ????????? ???? ????? ????????? ?????? ???????? ???? ????? ???? ?? ????? ?????? ?????? ?? ???????. ??? ??????? ?????? ?????? ??? ???????. ?????? ???? ?? ????? ????? ?????? ????? ??????? ???????. ?????? ???????? ??????? ?? ASP.Net ???????? ??? ??????? ?????? ? ???? ??????? ???????:

1. ????? ????? ??? ASP.NET ???? ???????? Visual Basic .NET.
2. ?????????? ??? ????? WebForm1.aspx.
3. ?? ????? ??? HTML WebForm1.aspx ? ?????? ????????? ???????? ???????? ????? ????????? ???????? ??????:

   <%@ Import Namespace="System.Data.SqlClient" %>
   <%@ Import Namespace="System.Data" %>
   <HTML>
   	<script language="vb" runat="server">
   
   		Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
   			Dim Source As DataView
   
   		'Retrieve the DataView object from the Cache class. If it does not exist, add the DataView object to the Cache class.
   
   		Source = CType(Cache("MyDataSet"), DataView)
   
   		If Source Is Nothing Then
   
   			Dim myConnection As SqlConnection = New SqlConnection("Server=ServerName; database=Pubs; user id=UID; password=PWD;")
   			Dim myCommand As SqlDataAdapter = New SqlDataAdapter("select * from Authors", myConnection)
   			Dim ds As DataSet = New DataSet()
   			myCommand.Fill(ds, "Authors")
   
   			Source = New DataView(ds.Tables("Authors"))
   			Cache("MyDataSet") = Source
   			CacheMsg.Text = "Dataset created explicitly"
   			
   		Else
   			
   			CacheMsg.Text = "Dataset retrieved from cache"
   
   		End If
   
   		' Bind the DataView object to DataGrid. 
   		MyDataGrid.DataSource = Source
   		MyDataGrid.DataBind()
   
   		End Sub
   
   	</script>
   	<body>
   		<form method="GET" runat="server" ID="Form1">
   	      <h3><font face="Verdana">Caching Data</font></h3>
   			<ASP:DataGrid id="MyDataGrid" runat="server"
   			Width="700"
   			BackColor="#ccccff"
   			BorderColor="black"
   			ShowFooter="false"
   			CellPadding=3
   			CellSpacing="0"
   			Font-Name="Verdana"
   			Font-Size="8pt"
   			HeaderStyle-BackColor="#aaaad" />
   			<p>
   			<i><asp:label id="CacheMsg" runat="server"/></i>
   	    </form>
   		</P>
   	</body>
   </HTML>

   ?????? ??????? ????? ServerNameUID ? PWD ?? ????? ???????? ???????? ????? SqlConnection ?? SQL Server ????? ? ????? ???????? ? ???? ??????.
4. ?? ??????? ????? ? ???? ??? "????" ?????? ???????.
   
   ?????? ??? ????? ????? ??????? ????? ????? ???? Cached.

?????? ??? ??????? ??????? ???? ??? ????? ???????? ??????? ?????? ?? "????? ??????? ?? Microsoft:

????? ?? ?????????? ?? ?????? ???? Microsoft ?????? ??? ?????: