Control.ViewState Control.ViewState Control.ViewState Control.ViewState Property

定義

取得狀態資訊的字典,允許您在相同網頁的多個要求之間,儲存和還原伺服器控制項的檢視狀態。Gets a dictionary of state information that allows you to save and restore the view state of a server control across multiple requests for the same page.

protected:
 virtual property System::Web::UI::StateBag ^ ViewState { System::Web::UI::StateBag ^ get(); };
[System.ComponentModel.Browsable(false)]
protected virtual System.Web.UI.StateBag ViewState { get; }
member this.ViewState : System.Web.UI.StateBag
Protected Overridable ReadOnly Property ViewState As StateBag

屬性值

StateBag 類別的執行個體,包含伺服器控制項的檢視狀態資訊。An instance of the StateBag class that contains the server control's view-state information.

範例

下列範例示範實作Text屬性來儲存和擷取其值,從其控制ViewState屬性。The following example demonstrates implementing a Text property that stores and retrieves its value from its control's ViewState property.

// Add property values to view state with set;
// retrieve them from view state with get.
public String Text
{
    get 
    { 
        object o = ViewState["Text"]; 
        return (o == null)? String.Empty : (string)o;
    }

    set
    {
        ViewState["Text"] = value;
    }
}

' Add property values to view state with set; 
' retrieve them from view state with get.
Public Property [Text]() As String
    Get
        Dim o As Object = ViewState("Text")
        If (IsNothing(o)) Then
            Return String.Empty
        Else
            Return CStr(o)
        End If
    End Get
    Set(ByVal value As String)
        ViewState("Text") = value
    End Set
End Property

備註

伺服器控制項的檢視狀態是累積的所有屬性值。A server control's view state is the accumulation of all its property values. 若要保留這些值的 HTTP 要求之間,ASP.NET 伺服器控制項使用這個屬性,這是執行個體的StateBag類別,來儲存屬性值。In order to preserve these values across HTTP requests, ASP.NET server controls use this property, which is an instance of the StateBag class, to store the property values. 值會接著為變數時傳遞至 HTML 隱藏 input 元素,會處理後續要求。The values are then passed as a variable to an HTML hidden input element when subsequent requests are processed. 如需儲存伺服器控制項檢視狀態的詳細資訊,請參閱 < ASP.NET 狀態管理概觀For more information about saving server control view state, see ASP.NET State Management Overview.

根據預設,所有的伺服器控制項的啟用檢視狀態,但情況下,您會想要停用它。View state is enabled for all server controls by default, but there are circumstances in which you will want to disable it. 如需詳細資訊,請參閱 < ASP.NET 效能概觀For more information, see ASP.NET Performance Overview.

字典,以及如何使用它們的相關資訊,請參閱集合和資料結構For information about dictionaries and how to use them, see Collections and Data Structures.

適用於

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