UserControl.IsPostBack 屬性

public:
 property bool IsPostBack { bool get(); };

[System.ComponentModel.Browsable(false)]
public bool IsPostBack { get; }

[<System.ComponentModel.Browsable(false)>]
member this.IsPostBack : bool

Public ReadOnly Property IsPostBack As Boolean

屬性值

如果使用者控制項為回應用戶端回傳而被載入，則為 true，否則為 false。

屬性

BrowsableAttribute

範例

如果使用者控制項的 屬性傳回 false ， IsPostBack 下列範例會將兩個索引鍵值組新增至與使用者控制項相關聯的應用程式狀態。 符合此條件時，程式碼會透過使用者控制項的 Application 屬性使用 Add 方法，以新增索引鍵及其值。

if (!myControl.IsPostBack)
{
  // Add new objects to the HttpApplicationState.
  // These will be maintained as long as the application is active.
  myControl.Application.Add("Author","Shafeeque");
  myControl.Application.Add("Date",new DateTime(2001,6,21));
  // Add an object to the cache with expirations 
  // set to 0.1 minute.
  myControl.Cache.Insert("MyData1", "somevalue", null, DateTime.Now.AddMinutes(0.1), Cache.NoSlidingExpiration);
}

If (Not myControl.IsPostBack) Then
  ' Add new objects to the HttpApplicationState.
  ' These will be maintained as long as the as the application is active.
  myControl.Application.Add("Author","Shafeeque")                
  myControl.Application.Add("Date",new DateTime(2001,6,21))
  ' Add an object to the cache with expirations
  ' set to 0.1 minute.
  myControl.Cache.Insert("MyData1", "somevalue", Nothing, DateTime.Now.AddMinutes(0.1), Cache.NoSlidingExpiration)        

適用於

另請參閱

• IsPostBack