HtmlElementCollection Classe

Definição

public ref class HtmlElementCollection sealed : System::Collections::ICollection

public sealed class HtmlElementCollection : System.Collections.ICollection

type HtmlElementCollection = class
    interface ICollection
    interface IEnumerable

Public NotInheritable Class HtmlElementCollection
Implements ICollection

Herança

Object

HtmlElementCollection

Implementações

ICollection IEnumerable

Exemplos

O exemplo de código seguinte utiliza HtmlElementCollection objetos para imprimir uma representação textual do Modelo de Objeto do Documento (DOM) de uma página.

private void PrintDomBegin()
{
    if (webBrowser1.Document != null)
    {
        HtmlElementCollection elemColl = null;
        HtmlDocument doc = webBrowser1.Document;
        if (doc != null)
        {
            elemColl = doc.GetElementsByTagName("HTML");
            String str = PrintDom(elemColl, new System.Text.StringBuilder(), 0);
            webBrowser1.DocumentText = str;
        }
    }
}

private string PrintDom(HtmlElementCollection elemColl, System.Text.StringBuilder returnStr, Int32 depth)
{
    System.Text.StringBuilder str = new System.Text.StringBuilder();

    foreach (HtmlElement elem in elemColl)
    {
        string elemName;

        elemName = elem.GetAttribute("ID");
        if (elemName == null || elemName.Length == 0)
        {
            elemName = elem.GetAttribute("name");
            if (elemName == null || elemName.Length == 0)
            {
                elemName = "<no name>";
            }
        }

        str.Append(' ', depth * 4);
        str.Append(elemName + ": " + elem.TagName + "(Level " + depth + ")");
        returnStr.AppendLine(str.ToString());

        if (elem.CanHaveChildren)
        {
            PrintDom(elem.Children, returnStr, depth + 1);
        }

        str.Remove(0, str.Length);
    }

    return (returnStr.ToString());
}

Private Sub PrintDomBegin()
    If (WebBrowser1.Document IsNot Nothing) Then
        Dim ElemColl As HtmlElementCollection

        Dim Doc As HtmlDocument = WebBrowser1.Document
        If (Not (Doc Is Nothing)) Then
            ElemColl = Doc.GetElementsByTagName("HTML")
            Dim Str As String = PrintDom(ElemColl, New System.Text.StringBuilder(), 0)

            WebBrowser1.DocumentText = Str
        End If
    End If
End Sub

Private Function PrintDom(ByVal ElemColl As HtmlElementCollection, ByRef ReturnStr As System.Text.StringBuilder, ByVal Depth As Integer) As String
    Dim Str As New System.Text.StringBuilder()

    For Each Elem As HtmlElement In ElemColl
        Dim ElemName As String

        ElemName = Elem.GetAttribute("ID")
        If (ElemName Is Nothing Or ElemName.Length = 0) Then
            ElemName = Elem.GetAttribute("name")
            If (ElemName Is Nothing Or ElemName.Length = 0) Then
                ElemName = "<no name>"
            End If
        End If

        Str.Append(CChar(" "), Depth * 4)
        Str.Append(ElemName & ": " & Elem.TagName & "(Level " & Depth & ")")
        ReturnStr.AppendLine(Str.ToString())

        If (Elem.CanHaveChildren) Then
            PrintDom(Elem.Children, ReturnStr, Depth + 1)
        End If

        Str.Remove(0, Str.Length)
    Next

    PrintDom = ReturnStr.ToString()
End Function