Vb.net 如何将文本参数传递给ProgressChanged？

我是一名VB.Net新手，需要编写一个带有While/End While循环的长时间运行的流程

为了避免冻结UI，我在表单上添加了一个BackgroundWorker对象

接下来，我需要更新UI，但发现线程无法做到这一点。相反，线程必须调用ReportProgress（）来触发ProgressChanged（）事件

但是，我需要将文本从异常（例如Message）传递到事件，但没有找到如何执行此操作的示例。我需要那条短信来更新表单的标题栏

代码如下：

Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
    While (True)
        Try
            ...
        Catch ex As Exception
            'Cross-thread operation not valid: Control 'Form1' accessed from a thread other than the thread it was created on.
            'Me.Text = ex.Message

            BackgroundWorker1.ReportProgress(100)
        End Try

        System.Threading.Thread.Sleep(2000)
    End While
End Sub

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged

        'How to get ex.Message, and change the form's title bar accordingly?
        'Me.Text = ???
End Sub

多谢各位

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编辑：以下是如何获取表单并将错误消息传递给事件，以及如何更改表单的标题文本：

        Catch ex As Exception
            BackgroundWorker1.ReportProgress(100, ex.Message)
        End Try

        System.Threading.Thread.Sleep(2000)
    End While
End Sub

Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As System.Object, ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BackgroundWorker1.ProgressChanged
    Me.Text = e.UserState.ToString
End Sub

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Reportprogress方法具有接受Int32和对象参数的。您可以将消息或完整异常传递给主线程

在ProgressChanged事件中，可以从UserState属性检索它