HtmlDocument.GetElementsByTagName(String) 方法

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

检索具有指定 HTML 标记的元素集合。

public:
 System::Windows::Forms::HtmlElementCollection ^ GetElementsByTagName(System::String ^ tagName);

public System.Windows.Forms.HtmlElementCollection GetElementsByTagName (string tagName);

member this.GetElementsByTagName : string -> System.Windows.Forms.HtmlElementCollection

Public Function GetElementsByTagName (tagName As String) As HtmlElementCollection

参数

tagName

String

要检索的 HtmlElement 对象的 HTML 标记名。

返回

HtmlElementCollection

标记名等于 tagName 参数的元素集合。

示例

HTML 页面通常使用 META 标记嵌入有关文档的任意信息。 以下 HTML 代码示例检索 HTML 文档中的所有 META 标记，查找 META 具有名称 Description的标记，并将其显示给用户。 The code example requires that your application has a WebBrowser control named WebBrowser1.

private void DisplayMetaDescription()
{
    if (webBrowser1.Document != null)
    {
        HtmlElementCollection elems = webBrowser1.Document.GetElementsByTagName("META");
        foreach (HtmlElement elem in elems)
        {
            String nameStr = elem.GetAttribute("name");
            if (nameStr != null && nameStr.Length != 0)
            {
                String contentStr = elem.GetAttribute("content");
                MessageBox.Show("Document: " + webBrowser1.Url.ToString() + "\nDescription: " + contentStr);
            }
        }
    }
}

Private Sub DisplayMetaDescription()
    If (WebBrowser1.Document IsNot Nothing) Then
        Dim Elems As HtmlElementCollection 
        Dim WebOC as WebBrowser = WebBrowser1

    Elems = WebOC.Document.GetElementsByTagName("META")

        For Each elem As HtmlElement In Elems
            Dim NameStr As String = elem.GetAttribute("name")

            If ((NameStr IsNot Nothing) And (NameStr.Length <> 0)) Then
                If NameStr.ToLower().Equals("description") Then
                    Dim ContentStr As String = elem.GetAttribute("content")
                    MessageBox.Show("Document: " & WebOC.Url.ToString() & vbCrLf & "Description: " & ContentStr)
                End If
            End If
        Next
    End If
End Sub

另请参阅

• getElementsByTagName 方法