vb.net - 如何使用 VB.net 从网站的 Class 元素中提取文本

Question

我正在尝试从网站上检索一些文本并尝试了以下操作：

 Dim inStream As StreamReader
    Dim webRequest As WebRequest
    Dim webresponse As WebResponse
    Try
        webRequest = WebRequest.Create(txtScrape.Text)
        webresponse = webRequest.GetResponse()
        inStream = New StreamReader(webresponse.GetResponseStream())
        txtFormatted.Text = inStream.ReadToEnd()

    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

但是我收到以下错误：

An unhandled exception of type 'System.Net.WebException' occurred in System.dll
Additional information: The underlying connection was closed: An unexpected error occurred on a send.

任何帮助都将得到应用或其他从 class="SummaryCity" 中提取文本的方法，如下所示

<span class="SummaryCity">
                thetextIneed, Egypt
        </span>

标签： vb.netweb-scraping