vb.net - 有没有办法查找网站上是否有文字？

Question

所以说我想找到“你好，世界！”这个词。在网页上。它的 ID 为“文本”。使用名为 WebBrowser1 的 WebBrowser，如果该文本存在于网页上，是否有方法返回 true，或者如果它不存在，它将返回 false？无论哪种方式，URL 都将完全相同。

编辑：到达它的 HTML 路径很长，所以我需要在页面上找到文本。

Answer 1

第一的：

Dim wb as new WebClient
Dim html as string = wb.DownloadString("http://stackoverflow.com")

然后，您搜索该字符串，为此您可以使用IndexOf。

Answer 2

我支持 Luxspes 的回答。

更多代码只是为了更有帮助。尚未对此进行测试，我希望这可行：

Dim wb As New WebClient
Dim html As String = wb.DownloadString("http://stackoverflow.com")
'To know if there are YOUR STRING inside
Dim BooleanAnswer As Boolean = html.Contains("YOUR STRING")
'To know how many instances
Dim HowMany As Integer = FindIndexes("YOUR STRING", html).Count
'To output them all through Console.Write or your preferred output(the indexes)
Dim FoundList As List(Of Integer) = FindIndexes("YOUR STRING", html)
For i As Integer = 0 to FoundList.Count - 1
            Console.Write(i & "-index: " & FoundList(i).toString)
Next i

'Function
Private Function FindIndexes(ByVal searchWord As String, ByVal src As String) as List(Of Integer)
            Dim searchSRC As String = src
            Dim toFind As String = searchWord
            Dim lastIndex As Integer = 0
            Dim listOfIndexes As New List(Of Integer)
            Do Until lastIndex < 0
                lastIndex = searchSRC.IndexOf(toFind, lastIndex + toFind.Length)
                If lastIndex >= 0 Then
                    listOfIndexes.Add(lastIndex)
                End If
            Loop
            Return listOfIndexes
End Function