VB.Net-从后台工作者更新进度栏 [英] VB.Net - Updating progress bar from background worker

问题描述

我正在尝试在VB.Net中构建一个日志解析器，它将使用IIS日志并将其插入数据库中.从未真正开发出一款完善的桌面应用程序，我遇到了许多绊脚石，所以，如果我的问题很不为人所知，请原谅我.我正在学习跑步时要走路.

我正在使用的代码如下:

 Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
    MyBase.OnLoad(e)
    BackgroundWorker1.RunWorkerAsync()
End Sub

Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As DoWorkEventArgs) Handles BackgroundWorker1.DoWork
    Dim logfile = "C:\ex111124.log"
    Dim FileLength As Long = New System.IO.FileInfo(logfile).Length
    logFileLabel.Text = logfile

    Dim objReader As New System.IO.StreamReader(logfile)
    Do While objReader.Peek() <> -1
        OngoingLog.AppendText(objReader.ReadLine)
        'BackgroundWorker1.ReportProgress(e.percentProgress)
        Loop()
    objReader.Close()
    objReader = Nothing

End Sub

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    'Me.crunchingProgress.Value = e.ProgressPercentage
End Sub

Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
    Close()
End Sub

因此该函数有效，当打开此窗口时，它将开始读取日志文件并使用当前已读取的所有行来更新文本框，但我还希望它更新主线程中的进度条，名为crunchingProgress./p>

任何帮助将不胜感激.

解决方案

这应该可以解决问题:

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    Invoke(Sub()
        Me.crunchingProgress.Value = e.ProgressPercentage
    End Sub)
End Sub

I am trying to build a log parser in VB.Net that will take IIS logs and insert them into a database. Having never really made a full out desktop application, I'm hitting a number of stumbling blocks, so please forgive me if my questions a very uninformed; I'm learning to walk while running.

The code that I'm working with looks like this:

 Protected Overrides Sub OnLoad(ByVal e As System.EventArgs)
    MyBase.OnLoad(e)
    BackgroundWorker1.RunWorkerAsync()
End Sub

Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As DoWorkEventArgs) Handles BackgroundWorker1.DoWork
    Dim logfile = "C:\ex111124.log"
    Dim FileLength As Long = New System.IO.FileInfo(logfile).Length
    logFileLabel.Text = logfile

    Dim objReader As New System.IO.StreamReader(logfile)
    Do While objReader.Peek() <> -1
        OngoingLog.AppendText(objReader.ReadLine)
        'BackgroundWorker1.ReportProgress(e.percentProgress)
        Loop()
    objReader.Close()
    objReader = Nothing

End Sub

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    'Me.crunchingProgress.Value = e.ProgressPercentage
End Sub

Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
    Close()
End Sub

So the function works, when this window is opened it starts to read the log file and updates a textbox with all of the rows currently read, but I also want it to update a progress bar in my main thread called crunchingProgress.

Any help would be greatly appreciated.

解决方案

This should do the trick:

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    Invoke(Sub()
        Me.crunchingProgress.Value = e.ProgressPercentage
    End Sub)
End Sub

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