vb.net 教程 12-2 HtmlDocument类 3

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继续获得更多的网页信息：

获得网页上所有图片信息：

    Private Sub btnImages_Click(sender As Object, e As EventArgs) Handles btnImages.Click
        Dim htmlInfo As String = ""
        Dim imgCount As Integer = 0
        Dim imgs As HtmlElementCollection
        imgs = wbMain.Document.Images
        For Each img As HtmlElement In imgs
            imgCount += 1
            htmlInfo &= "图片" & imgCount & ": " & img.OuterHtml & ControlChars.CrLf
        Next
        txtInfo.Text = htmlInfo
    End Sub
运行时如图：

获得网页上所有链接信息：

    Private Sub btnLinks_Click(sender As Object, e As EventArgs) Handles btnLinks.Click
        Dim htmlInfo As String = ""
        Dim linkCount As Integer = 0
        Dim lnks As HtmlElementCollection
        lnks = wbMain.Document.Links
        For Each lnk As HtmlElement In lnks
            linkCount += 1
            htmlInfo &= "链接" & linkCount & ": " & lnk.OuterHtml & ControlChars.CrLf
        Next
        txtInfo.Text = htmlInfo
    End Sub
 

还可以通过All属性获得网页上的所有元素：

    Private Sub btnAllElement_Click(sender As Object, e As EventArgs) Handles btnAllElement.Click
        Dim htmlInfo As String = ""
        Dim htmlAlls As HtmlElementCollection
        htmlAlls = wbMain.Document.All
        For Each htmlSingle As HtmlElement In htmlAlls
            htmlInfo &= htmlSingle.TagName.ToUpper & ControlChars.CrLf
        Next
        txtInfo.Text = htmlInfo
    End Sub
 

以上代码用到了HtmlElement类，相关知识请参看下一节教程。

由于.net平台下C#和vb.NET很相似，本文也可以为C#爱好者提供参考。

学习更多vb.net知识，请参看vb.net教程 目录

 
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