Я пытаюсь получить ответ от функции BackgroundWorker, однако он нажимает кнопку Return до запуска RunWorkerCompleted.Как только код нажимает «Thread_Load», он запускает Return.
Здесь я просто получаю строку назад, но код завершения отправит команду SQL, обработает ее и отправит ответ.
Спасибо за вашу помощь.
Я пытался использовать 'Пока ответ = ничего', но код просто зависает.
В основной форме
Private Sub RibbonButton3_Click(sender As Object, e As EventArgs) Handles RibbonButton3.Click
Dim NewCall As New TestThreads_SQL_Class
Dim reply As String
reply = NewCall.Thread_Load()
MessageBox.Show(reply)
End Sub
Тогдав TestThreads_SQL_Class
Imports System.ComponentModel
Public Class TestThreads_SQL_Class
Public Class ArgumentType
Public _a As Int32
Public _b As Int32
End Class
Dim WithEvents BackgroundWorker1 As New BackgroundWorker
Dim reply As String = Nothing
Public Function Thread_Load()
' Create the argument object.
Dim args As ArgumentType = New ArgumentType With {
._a = 5,
._b = 6
}
' Start up the BackgroundWorker1. & Pass argument object to it.
BackgroundWorker1.RunWorkerAsync(args)
Return reply
End Function
Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
' Do some time-consuming work on this thread.
System.Threading.Thread.Sleep(1000)
' Get argument.
Dim args As ArgumentType = e.Argument
' Return value based on the argument.
e.Result = args._a * args._b
End Sub
Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
' Called when the BackgroundWorker is completed.
reply = (e.Result.ToString())
End Sub
End Class