HtmlTextWriter.TagKey 屬性

定義

命名空間:

System.Web.UI

組件:

System.Web.dll

取得或設定 HtmlTextWriterTag 指定標記元素的值。

protected:
 property System::Web::UI::HtmlTextWriterTag TagKey { System::Web::UI::HtmlTextWriterTag get(); void set(System::Web::UI::HtmlTextWriterTag value); };

protected System.Web.UI.HtmlTextWriterTag TagKey { get; set; }

member this.TagKey : System.Web.UI.HtmlTextWriterTag with get, set

Protected Property TagKey As HtmlTextWriterTag

屬性值

HtmlTextWriterTag

就是正在渲染開頭標籤的標記元素。

例外狀況

ArgumentOutOfRangeException

財產價值無法設定。

範例

以下程式碼範例展示了該類別中由該HtmlTextWriter類別衍生出的覆蓋版本RenderBeforeContent。 它利用屬性 TagKey 的值來判斷使用自訂 HtmlTextWriter 物件的伺服器控制項是否正在渲染 <label> 標記元素。 如果是， <font> 則會回傳一個屬性 color 設為 的 red 元素，以修改該元素文字的格式 <label> 。

// Override the RenderBeforeContent method to write
// a font element that applies red to the text in a Label element.

virtual String^ RenderBeforeContent() override
{
   
   // Check to determine whether the element being rendered
   // is a label element. If so, render the opening tag
   // of the font element; otherwise, call the base method.
   if ( TagKey == HtmlTextWriterTag::Label )
   {
      return "<font color=\"red\">";
   }
   else
   {
      return __super::RenderBeforeContent();
   }
}

// Override the RenderBeforeContent method to write
// a font element that applies red to the text in a Label element.
protected override string RenderBeforeContent()
{
    // Check to determine whether the element being rendered
    // is a label element. If so, render the opening tag
    // of the font element; otherwise, call the base method.
    if (TagKey == HtmlTextWriterTag.Label)
    {
        return "<font color=\"red\">";
    }
    else
    {
        return base.RenderBeforeContent();
    }
}

' Override the RenderBeforeContent method to write
' a font element that applies red to the text in a Label element.
Protected Overrides Function RenderBeforeContent() As String
    ' Check to determine whether the element being rendered
    ' is a label element. If so, render the opening tag
    ' of the font element; otherwise, call the base method.
    If TagKey = HtmlTextWriterTag.Label Then
        Return "<font color=""red"">"
    Else
        Return MyBase.RenderBeforeContent()
    End If
End Function 'RenderBeforeContent

備註

此 TagKey 性質僅對繼承自該 HtmlTextWriter 類別的類別有用。 你應該只在呼叫RenderBeginTag方法時讀取或設定該TagKey屬性;這是唯一一次設定為一致值。

另請參閱

• TextWriter
• HtmlTextWriterTag
• RenderBeginTag
• TagName