签名异步。和同步方法

Question

如果我有一个方法 Sub Foo(fooParam as String) 并且我想编写像

这样的异步版本

 Function FooAsync (fooParam as String) as Task
     Return Task.Run(Sub() Foo(fooParam))
 End Function

现在需要进度和注销，所以需要把签名改成

Function FooAsync (fooParam as String, progress as IProgress(of String), cancellationToken as CancellationToken) as Task
     Return Task.Run(Sub() Foo(fooParam))
 End Function

Microsoft 说异步版本应该与同步版本具有相同的签名，那么这里的最佳实践是什么，还是我理解错了？

将 progress 和 cancellationToken 传递给同步。方法对我来说似乎毫无意义......但只有这样我才能结束同步。方法和 return 它作为任务。

为了更好地理解这里的代码，了解我现在的表现。在 Async 中，刚刚编写了添加进度和取消调用的同步方法。但我确定这不是我应该这样做的方式：

Public Sub DoCalibration(calibrationHoldTimeForReading As Integer)
    If Not PressureCalibrator.SerialPort.IsOpen() Then
        PressureCalibrator.SerialPort.Open()
    End If
    PressureCalibrator.PressureUnit = PressureUnit.bar
    For Each point In InputList
        SetMessPointAndMeasure(point, calibrationHoldTimeForReading)
    Next
    PressureCalibrator.Vent()
    PressureCalibrator.SerialPort.Close()
    Log.WriteLog("Calibration completed.")
End Sub


Public Function DoCalibrationAsync(calibrationHoldTimeForReading As Integer, Optional progress As IProgress(Of CalibrationStepResult) = Nothing, Optional cancellationToken As CancellationToken = Nothing) As Task 
     Return Task.Run((Sub()
                        If Not PressureCalibrator.SerialPort.IsOpen() Then
                            PressureCalibrator.SerialPort.Open()
                        End If
                        PressureCalibrator.PressureUnit = PressureUnit.bar
                        For Each point In InputList
                            Dim measureResult = SetMessPointAndMeasure(point, calibrationHoldTimeForReading)
                            If Not IsNothing(cancellationToken) Then  
                            CancellationToken.ThrowIfCancellationRequested()
                            End If
                            If Not IsNothing(progress) Then
                                progress.Report(measureResult)
                            End If
                        Next
                        PressureCalibrator.Vent()
                        PressureCalibrator.SerialPort.Close()
                        Log.WriteLog("Calibration completed.")
                    End Sub), cancellationToken)
End Function

Answer 1

感谢@PauloMorgado，我能够通过阅读他发布的文章以及其他相关文章来理解此处的指南。

签名异步。和同步方法

Signature async. and synchronous methods

vb.net

asynchronous

signature

async-await