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Private _Proxies As New List(Of String)
Private _Array As New List(Of String)

Private Sub btnLeech_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Leech_btn.Click
    Worker.RunWorkerAsync(_Array)
End Sub

'Open a bunch of new threads to download sources of webpages
Private Sub Fetch(ByVal sender As System.Object, _
                                 ByVal e As System.ComponentModel.DoWorkEventArgs) Handles Worker.DoWork
    Dim websiteUri As Uri = Nothing
    Dim Website As String
    For I = 0 To _Array.ToList.Count - 1
        Website = _Array(I)
        Using wc As Net.WebClient = New Net.WebClient
            AddHandler wc.DownloadStringCompleted, AddressOf SourceDownloaded
            If Uri.TryCreate(Website, UriKind.Absolute, websiteUri) Then
                wc.DownloadStringAsync(New Uri(Website))
                Threading.Thread.Sleep(250)
            Else
                If Notify.Checked = True Then
                    TrayIcon.ShowBalloonTip(1, "Invalid website", "There was a invalid site in the list." & Website.ToString, ToolTipIcon.Error)
                    Me.TrashSite_list.Items.Add(Website)
                Else
                    Me.TrashSite_list.Items.Add(Website)
                End If
            End If
        End Using
    Next
End Sub
'Grab the proxies from the webpages
Private Sub SourceDownloaded(ByVal sender As Object, ByVal e As Net.DownloadStringCompletedEventArgs)
    Dim strRegex As String = "\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\:[0-9]{1,5}\b"
    Dim myRegexOptions As RegexOptions = RegexOptions.None
    Dim myRegex As New Regex(strRegex, myRegexOptions)
    Dim frm As New Proxies
    Dim i As Integer
    My.Settings.Proxies = New StringCollection
    If e.Error Is Nothing Then
        For Each myMatch As Match In myRegex.Matches(e.Result)
            If myMatch.Success Then
                Try
                    i += i
                    _Proxies.Add(myMatch.ToString)
                    Worker.ReportProgress(i)
                Catch ex As WebException
                    MessageBox.Show(
                        ex.ToString,
                        ErrorToString,
                        Windows.Forms.MessageBoxButtons.OK)
                End Try
            End If
        Next
    End If
End Sub

Private Sub Worker_ProgressChanged(sender As Object, e As System.ComponentModel.ProgressChangedEventArgs) Handles Worker.ProgressChanged
    Proxy_list.Items.AddRange(_Proxies.ToArray)
        Proxy2_lbl.Text = "Proxies: " & Proxy2_list.Items.Count
    Proxy_lbl.Text = "Proxies: " & Proxy2_list.Items.Count
End Sub

这是我的代码，我希望它用它来更新 UI，但我不确定该怎么做。我正在寻找一个带有评论的示例，以便我可以理解它。到目前为止，我已经在几个网站上发布了，每个人都会告诉我该怎么做或给我一个例子，但没有人会告诉我如何处理这个例子！他们希望我知道代码的作用，但如果我知道它的作用，你真的认为我会问问题吗？无论如何，回到主题：

这就是我想要完成的。当我单击 Leech_btn 时，它会将我的所有网站从 Website_list 添加到一个名为“Array”的数组中。然后它以数组作为参数运行后台工作程序。后台工作人员从列表中下载网站的字符串并将其移至 SourceDownloaded 进行过滤。（它会从网站上删除所有代理）然后它应该在 Proxy_list 中显示代理，但这是我遇到问题的地方。我应该怎么办？

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1 回答 1

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如果我理解正确，问题出在

Dim Proxies() As String = My.Resources.SiteList6.Split(vbNewLine)
Proxy_list.Items.AddRange(Proxies)

这是因为 UI 和 worker 在不同的线程中。你可以添加这个：

Private Delegate Sub UpdateListDelegate(byval itemName() as string)
Private Sub UpdateList(byval itemName() as string)
    If Me.InvokeRequired Then
        Me.Invoke(New UpdateListDelegate(AddressOf UpdateList), itemName)
    Else
        ' UpdateList
        ' add list add code
        Proxy_list.Items.AddRange(itemName)
    End If
End Sub

在您的代码中，将“Proxy_list.Items.AddRange(Proxies)”替换为

 UpdateList(Proxies)

参见vb.net: listbox.items.add() throws exception in same class，类似的问题。

于 2012-10-30T17:47:02.043 回答