Page.Cache 屬性

定義

命名空間:

System.Web.UI

組件:

System.Web.dll

取得 Cache 與該頁面所屬應用程式相關的物件。

public:
 property System::Web::Caching::Cache ^ Cache { System::Web::Caching::Cache ^ get(); };

[System.ComponentModel.Browsable(false)]
public System.Web.Caching.Cache Cache { get; }

[<System.ComponentModel.Browsable(false)>]
member this.Cache : System.Web.Caching.Cache

Public ReadOnly Property Cache As Cache

屬性值

Cache

與 Cache 該頁面的應用程式相關聯。

屬性

BrowsableAttribute

例外狀況

HttpException

不會建立一個 Cache 實例。

範例

以下程式碼範例利用 屬性Page.Cache將兩個整數的和插入物件中System.Web.Caching.Cache。 接著它會用該 Cache.Get 方法取得該值，並將其寫入 Label 網頁伺服器控制項。

// This is a simple page that demonstrates how to place a value
// in the cache from a page, and one way to retrieve the value.
// Declare two constants, myInt1 and myInt2 and set their values
// and declare a string variable, myValue.
const int myInt1 = 35;
const int myInt2 = 77;
string myValue;

// When the page is loaded, the sum of the constants
// is placed in the cache and assigned a key, key1.
void Page_Load(Object sender,  EventArgs arg) {
  Cache["key1"] = myInt1 + myInt2;

}

// When a user clicks a button, the sum associated
// with key1 is retrieved from the Cache using the
// Cache.Get method. It is converted to a string
// and displayed in a Label Web server control.
void CacheBtn_Click(object sender, EventArgs e) {
   if (Cache["key1"] == null) {
      myLabel.Text = "That object is not cached.";
   }
   else {
      myValue = Cache.Get("key1").ToString();
      myLabel.Text = myValue;
   }
}

  ' This is a simple page that demonstrates how to place a value
  ' in the cache from a page, and one way to retrieve the value.
  ' Declare two constants, myInt1 and myInt2 and set their values
  ' and declare a string variable, myValue.
  Const myInt1 As Integer = 35
  Const myInt2 As Integer = 77
  Dim myValue As String


  ' When the page is loaded, the sum of the constants
  ' is placed in the cache and assigned a key, key1.
  Sub Page_Load(sender As [Object], arg As EventArgs)
     Cache("key1")= myInt1 + myInt2
  End Sub 'Page_Load


  ' When a user clicks a button, the sum associated
  ' with key1 is retrieved from the Cache using the 
  ' Cache.Get method. It is converted to a string
  ' and displayed in a Label Web server control.
  Sub CacheBtn_Click(sender As Object, e As EventArgs)
    If Cache("key1") Is Nothing Then
     myLabel.Text = "That object is not cached."
    Else
     myValue = Cache.Get("key1").ToString()
     myLabel.Text = myValue
    End If
  End Sub 'CacheBtn_Click

備註

應用程式的 Cache 物件允許你在後續請求中儲存和檢索任意資料。 快取不會被特定關聯到某個頁面或使用者會話。 它主要用於提升應用程式效能。 欲了解更多資訊，請參閱 快取應用程式資料。 欲了解更多關於應用程式快取與頁面輸出快取差異的資訊，請參閱 ASP.NET 快取概述。

另請參閱

• Cache
• 快取應用程式資料
• ASP.NET 年快取導論