Html32TextWriter.SupportsItalic 属性

定义

命名空间:

System.Web.UI

程序集:

System.Web.dll

获取或设置一个布尔值，该值指示请求设备是否支持斜体 HTML 文本。 使用 SupportsItalic 属性按条件向 Html32TextWriter 输出流呈现斜体文本。

public:
 property bool SupportsItalic { bool get(); void set(bool value); };

public bool SupportsItalic { get; set; }

member this.SupportsItalic : bool with get, set

Public Property SupportsItalic As Boolean

属性值

Boolean

如果请求设备支持斜体文本，则为 true；否则为 false。 默认值为 true。

示例

下面的代码示例演示如何重写 RenderBeforeContent 和 RenderAfterContent 方法。 每个重写都会检查元素是否 span 正在呈现，然后使用 SupportsItalic 该属性检查请求设备是否可以显示斜体格式。 如果设备支持斜体格式，该方法 RenderBeforeContent 将写入元素的 i 开始标记，并且 RenderAfterContent 该方法写入其结束标记。 如果设备不支持斜体格式，该方法RenderBeforeContent将一个元素的开始标记写入一个Font``color属性设置为海军蓝色的十六进制值，该方法RenderAfterContent将写入结束标记。

此代码示例是为类提供的大型示例的 Html32TextWriter 一部分。

// Override the RenderBeforeContent method to render
// styles before rendering the content of a <th> element.
protected override string RenderBeforeContent()
{
    // Check the TagKey property. If its value is
    // HtmlTextWriterTag.TH, check the value of the 
    // SupportsBold property. If true, return the
    // opening tag of a <b> element; otherwise, render
    // the opening tag of a <font> element with a color
    // attribute set to the hexadecimal value for red.
    if (TagKey == HtmlTextWriterTag.Th)
    {
        if (SupportsBold)
            return "<b>";
        else
            return "<font color=\"FF0000\">";
    }

    // Check whether the element being rendered
    // is an <H4> element. If it is, check the 
    // value of the SupportsItalic property.
    // If true, render the opening tag of the <i> element
    // prior to the <H4> element's content; otherwise, 
    // render the opening tag of a <font> element 
    // with a color attribute set to the hexadecimal
    // value for navy blue.
    if (TagKey == HtmlTextWriterTag.H4)
    {
        if (SupportsItalic)
            return "<i>";
        else
            return "<font color=\"000080\">";
    }
    // Call the base method.
    return base.RenderBeforeContent();
}

' Override the RenderBeforeContent method to render
' styles before rendering the content of a <th> element.
Protected Overrides Function RenderBeforeContent() As String
    ' Check the TagKey property. If its value is
    ' HtmlTextWriterTag.TH, check the value of the 
    ' SupportsBold property. If true, return the
    ' opening tag of a <b> element; otherwise, render
    ' the opening tag of a <font> element with a color
    ' attribute set to the hexadecimal value for red.
    If TagKey = HtmlTextWriterTag.Th Then
        If (SupportsBold) Then
            Return "<b>"
        Else
            Return "<font color=""FF0000"">"
        End If
    End If

    ' Check whether the element being rendered
    ' is an <H4> element. If it is, check the 
    ' value of the SupportsItalic property.
    ' If true, render the opening tag of the <i> element
    ' prior to the <H4> element's content; otherwise, 
    ' render the opening tag of a <font> element 
    ' with a color attribute set to the hexadecimal
    ' value for navy blue.
    If TagKey = HtmlTextWriterTag.H4 Then
        If (SupportsItalic) Then
            Return "<i>"
        Else
            Return "<font color=""000080"">"
        End If
    End If
    ' Call the base method.
    Return MyBase.RenderBeforeContent()
End Function

另请参阅

• RenderBeforeContent()
• RenderAfterContent()
• SupportsBold