1. import

Imports HtmlAgilityPack

2.判斷標籤有幾個

Dim countnode1 As Integer = htmlDoc.DocumentNode.SelectNodes(".//table").Count - 1

3.一個收尋網頁關鍵字的判斷

    Friend Sub HTMLPrint()

        Dim webClient As New System.Net.WebClient
        Dim WebSource As String = webClient.DownloadString("http://www.google.com.tw/search?hl=zh-TW&q=" & TextBox1.Text)
        webClient.Encoding = Encoding.Unicode

        Dim links As New List(Of String)()
        Dim htmlDoc As New HtmlAgilityPack.HtmlDocument()
        Dim for_use As Integer = 0
        htmlDoc.LoadHtml(WebSource)
        Try
            TextBox2.Text = ""

            Dim countnode1 As Integer = htmlDoc.DocumentNode.SelectNodes(".//table").Count - 1
            Label1.Text = countnode1

            For for_use = 1 To countnode1
                Dim node01 As HtmlNodeCollection = htmlDoc.DocumentNode.SelectNodes("/html[1]/body[1]/table[1]/tbody[1]/tr[1]/td[2]/div[1]/div[3]/table[1]/tr[" & for_use & "]/td[1]")
                For Each link As HtmlNode In node01
                    'TextBox2.Text = TextBox2.Text & link.InnerText & Environment.NewLine
                    'TextBox2.Text = TextBox2.Text & "," & link.InnerText & Environment.NewLine
                    TextBox2.Text = TextBox2.Text & link.InnerText & ","
                Next
                Dim node02 As HtmlNodeCollection = htmlDoc.DocumentNode.SelectNodes("/html[1]/body[1]/table[1]/tbody[1]/tr[1]/td[2]/div[1]/div[3]/table[1]/tr[" & for_use & "]/td[2]")
                For Each link As HtmlNode In node02
                    ' TextBox2.Text = TextBox2.Text & link.InnerText & Environment.NewLine
                    'TextBox2.Text = TextBox2.Text & "," & link.InnerText & Environment.NewLine
                    TextBox2.Text = TextBox2.Text & link.InnerText & ","

                Next
            Next

        Catch ex As Exception
            ' MessageBox.Show("沒有相關關鍵字")
            '  TextBox2.Text = ""
        End Try
    End Sub

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