HttpCapabilitiesBase.SupportsCallback 属性 (System.Web.Configuration)

SupportsCallback 属性

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此页面仅适用于

Microsoft Visual Studio 2008/.NET Framework 3.5

同时提供下列产品的其他版本：

.NET Framework 类库

HttpCapabilitiesBase..::.SupportsCallback 属性

更新：2007 年 11 月

获取一个值，该值指示浏览器是否支持回调脚本。

命名空间： System.Web.Configuration
程序集： System.Web（在 System.Web.dll 中）

语法

Visual Basic（声明）

Public Overridable ReadOnly Property SupportsCallback As Boolean

Visual Basic (用法)

Dim instance As HttpCapabilitiesBase
Dim value As Boolean

value = instance.SupportsCallback

public virtual bool SupportsCallback { get; }

Visual C++

public:
virtual property bool SupportsCallback {
    bool get ();
}

/** @property */
public boolean get_SupportsCallback()

JScript

public function get SupportsCallback () : boolean

属性值

类型：System..::.Boolean

如果浏览器支持回调脚本，则为 true；否则为 false。默认值为 false。

示例

下面的代码示例演示如何确定浏览器是否支持回调脚本。

Visual Basic

<%@ 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)).SupportsCallback Then
            labelText = "Browser supports callback scripts."
        Else
            labelText = "Browser does not support callback scripts."
        End If

        Label1.Text = labelText

    End Function 'CheckBrowserCaps
</script>

<html  >
<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="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).SupportsCallback)
        {
            labelText = "Browser supports callback scripts.";
        }
        else
        {
            labelText = "Browser does not support callback scripts.";
        }

        Label1.Text = labelText;
    }
</script>

<html  >
<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="VJ#"%>

<!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();
} //Page_Load

void CheckBrowserCaps() 
{
    String labelText = "";
    System.Web.HttpBrowserCapabilities myBrowserCaps = 
        get_Request().get_Browser();
    if (((System.Web.Configuration.HttpCapabilitiesBase)myBrowserCaps).
        get_SupportsCallback()) {
        labelText = "Browser supports callback scripts.";
    }
    else {
        labelText = "Browser does not support callback scripts.";
    }   
    Label1.set_Text(labelText);
} //CheckBrowserCaps
</script>

<html  >
<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>

平台

Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

.NET Framework 和 .NET Compact Framework 并不是对每个平台的所有版本都提供支持。有关支持的版本的列表，请参见.NET Framework 系统要求。

版本信息

.NET Framework

受以下版本支持：3.5、3.0、2.0

另请参见

参考

HttpCapabilitiesBase 类

HttpCapabilitiesBase 成员

System.Web.Configuration 命名空间

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