Progressbar aus asynchronem Prozeß steuern
roth am Mittwoch, 8.September 2010 um 21:30Public Class Form3
Private m_ToolstripProgressClass As ToolstripProgressClassPublic Sub New()‘ Dieser Aufruf ist für den Designer erforderlich.
InitializeComponent()
‘ Fügen Sie Initialisierungen nach dem InitializeComponent()-Aufruf hinzu.
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
m_ToolstripProgressClass = New ToolstripProgressClass(ToolStripProgressBar1)
Dim worker As WorkerClass = New WorkerClass
AddHandler m_ToolstripProgressClass.CallbackIsReady, AddressOf Worker_End
m_ToolstripProgressClass.Start(worker, False)
End Sub
Private Sub Worker_End()
MessageBox.Show(“Asynchron-Callback”)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
m_ToolstripProgressClass = New ToolstripProgressClass(ToolStripProgressBar1)
Dim worker As WorkerClass = New WorkerClassm_ToolstripProgressClass.Start(worker, True)
m_ToolstripProgressClass.Reset()
MessageBox.Show(“Synchron-Ende”)
End Sub
End Class
Public Class ToolstripProgressClass
Public Delegate Sub AsyncValueChanged(ByVal ProgessValue As Integer)
Public Delegate Sub CallbackIsReadyDelegate(ByRef sender As Object, ByRef p_strdate As String)
Public Delegate Sub AsyncLongrunning()Public Event CallbackIsReady(ByRef sender As Object, ByRef p_date As String)
Private m_AsyncMethod As AsyncLongrunning
Private callback As AsyncCallback
Private WithEvents EndeTimer As Windows.Forms.Timer
Private WithEvents m_ToolstripProgress As System.Windows.Forms.ToolStripProgressBar
Public Sub New(ByRef ToolstripProgress As System.Windows.Forms.ToolStripProgressBar)
m_ToolstripProgress = ToolstripProgress
EndeTimer =
New Windows.Forms.TimerEndeTimer.Interval = 3000
End Sub
Public Sub Start(ByRef LongrunningWorker As IWorkerWithProgressEvent, ByVal Synchron As Boolean)
AddHandler LongrunningWorker.ProgressValueChanged, AddressOf ProgressValueChanged
If Synchron Then
LongrunningWorker.Longrunning()
Else
callback = AddressOf CallbackHandlerm_AsyncMethod = AddressOf LongrunningWorker.Longrunning
Dim asyncResult As IAsyncResult = m_AsyncMethod.BeginInvoke(callback, m_AsyncMethod)
End If
End Sub
Public Sub CallbackHandler(ByVal result As IAsyncResult)
Dim asyncmethod As AsyncLongrunning = CType(result.AsyncState, AsyncLongrunning)m_AsyncMethod.EndInvoke(result)
Dim strText As String = “Fertig”
RaiseEvent CallbackIsReady(Me, strText)
End Sub
Private Sub async_CallbackIsReady(ByRef sender As Object, ByRef p_strTxt As String) Handles Me.CallbackIsReady
If m_ToolstripProgress.Owner.InvokeRequired Then
Dim isReady As CallbackIsReadyDelegate = AddressOf async_CallbackIsReady
Dim param As Object() = New Object() {Me, p_strTxt}m_ToolstripProgress.Owner.Invoke(isReady, param)
Else
Reset()
End If
End Sub
Public Sub Reset()m_ToolstripProgress.Value = 100
EndeTimer.Start()
End Sub
Private Sub ProgressValueChanged(ByVal Value As Integer)
If m_ToolstripProgress.Owner.InvokeRequired Then
Dim ValueChanged As AsyncValueChanged = AddressOf ProgressValueChanged
Dim param As Object() = New Object() {Value}m_ToolstripProgress.Owner.Invoke(ValueChanged, param)
Else
m_ToolstripProgress.Value = Value
End If
End Sub
Private Sub EndeTimer_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles EndeTimer.Tick
EndeTimer.Stop()
m_ToolstripProgress.Value = 0
End Sub
End Class
Public Class WorkerClass : Implements IWorkerWithProgressEvent
Public Event ProgressValueChanged(ByVal Value As Integer) Implements IWorkerWithProgressEvent.ProgressValueChanged
Public Sub LongRunning() Implements IWorkerWithProgressEvent.Longrunning
For i As Integer = 0 To 100System.Threading.Thread.Sleep(20)
RaiseEvent ProgressValueChanged(i)
Next
End Sub
End Class
Public Interface IWorkerWithProgressEvent
Event ProgressValueChanged(ByVal Value As Integer)Sub Longrunning()
End Interface
