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VB.NET AsyncOperation类代码示例

本文整理汇总了VB.NET中System.ComponentModel.AsyncOperation的典型用法代码示例。如果您正苦于以下问题:VB.NET AsyncOperation类的具体用法?VB.NET AsyncOperation怎么用?VB.NET AsyncOperation使用的例子?那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。


在下文中一共展示了AsyncOperation类的1个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的VB.NET代码示例。

示例1: CalculatePrimeAsync

' This method starts an asynchronous calculation. 
' First, it checks the supplied task ID for uniqueness.
' If taskId is unique, it creates a new WorkerEventHandler 
' and calls its BeginInvoke method to start the calculation.
Public Overridable Sub CalculatePrimeAsync( _
    ByVal numberToTest As Integer, _
    ByVal taskId As Object)

    ' Create an AsyncOperation for taskId.
    Dim asyncOp As AsyncOperation = _
        AsyncOperationManager.CreateOperation(taskId)

    ' Multiple threads will access the task dictionary,
    ' so it must be locked to serialize access.
    SyncLock userStateToLifetime.SyncRoot
        If userStateToLifetime.Contains(taskId) Then
            Throw New ArgumentException( _
                "Task ID parameter must be unique", _
                "taskId")
        End If

        userStateToLifetime(taskId) = asyncOp
    End SyncLock

    ' Start the asynchronous operation.
    Dim workerDelegate As New WorkerEventHandler( _
        AddressOf CalculateWorker)

    workerDelegate.BeginInvoke( _
        numberToTest, _
        asyncOp, _
        Nothing, _
        Nothing)

End Sub
开发者ID:VB.NET开发者,项目名称:System.ComponentModel,代码行数:35,代码来源:AsyncOperation


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