HttpCapabilitiesBase.RequiresSpecialViewStateEncoding 屬性

定義

命名空間:
System.Web.Configuration
組件:
System.Web.dll

會得到一個值，表示瀏覽器是否需要 VIEWSTATE 特別編碼的值。

public:
 virtual property bool RequiresSpecialViewStateEncoding { bool get(); };
public virtual bool RequiresSpecialViewStateEncoding { get; }
member this.RequiresSpecialViewStateEncoding : bool
Public Overridable ReadOnly Property RequiresSpecialViewStateEncoding As Boolean

屬性值

Boolean

true若瀏覽器要求VIEWSTATE特別編碼值;否則， false 預設值為 false。

範例

以下程式碼範例說明如何判斷瀏覽器是否需要 VIEWSTATE 特別編碼的值。

<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load(Object Sender, EventArgs e)
    {
        CheckBrowserCaps();
    }

    void CheckBrowserCaps()
    {
        String labelText = "";
        System.Web.HttpBrowserCapabilities myBrowserCaps = Request.Browser;
        if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).RequiresSpecialViewStateEncoding)
        {
            labelText = "Browser requires view state values to be specially encoded.";
        }
        else
        {
            labelText = "Browser does not require view state values to be specially encoded.";
        }

        Label1.Text = labelText;
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

<%@ page language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        CheckBrowserCaps()
    End Sub

    Function CheckBrowserCaps()

        Dim labelText As String = ""
        Dim myBrowserCaps As System.Web.HttpBrowserCapabilities = Request.Browser
        If (CType(myBrowserCaps, System.Web.Configuration.HttpCapabilitiesBase)).RequiresSpecialViewStateEncoding Then
            labelText = "Browser requires view state values to be specially encoded."
        Else
            labelText = "Browser does not require view state values to be specially encoded."
        End If

        Label1.Text = labelText

    End Function 'CheckBrowserCaps
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
    <title>Browser Capabilities Sample</title>
</head>
<body>
    <form runat="server" id="form1">
        <div>
            Browser Capabilities:
            <p/><asp:Label ID="Label1" Runat="server" />
        </div>
    </form>
</body>
</html>

備註

HTTP 是一種無狀態協定， VIEWSTATE 是一種用於在多次請求中持續維持客戶端變更的機制。 網頁上的每個控制項都包含一個 ViewState 屬性，代表用戶端所做的任何變更的累積。 在網頁表單頁面中，這些變更會以帶有type屬性為 hidden的 HTML <input> 元素的回傳資料value中編碼。 例如：

<input type="hidden" name="__VIEWSTATE" value="t0PH_u56?cDxleHQ7P=" />

若 true，則該值中的 VIEWSTATE 非字母字元將無法被瀏覽器或中介閘道正確傳送。 為了修正此問題，伺服器控制介面卡會將非字母字元替換為不需要 HTTP 請求編碼的字元 VIEWSTATE 。

適用於