Use 'async' and 'await' in VB.net without return needed

Question

I have a web application and need copy a batch of files from one file share server to another after a button click, async and awit seems to be a good way for this. I am not sure do I need Task.Run here? Is RunMoving() better move into another class for performance?

Here is my VB.NET code as following:

Public Sub FileMoving()
    PdfsMovingAsync()
    DoSomethingElse()
End Sub

Private Async Sub PdfsMovingAsync()
    Await Task.Run(Sub() RunMoving())
End Sub

Private Sub RunMoving()
    'Thread.Sleep(2000)
End Sub

Nkosi · Accepted Answer · 2019-02-22 08:36:14Z

2

PdfsMovingAsync should return Task. You want to avoid Async Subs.

Since DoSomethingElse is not dependent on PdfsMovingAsync completing first then they can run simultaneously.

Public Sub FileMoving()
    PdfsMovingAsync()
    DoSomethingElse()
End Sub

Private Function PdfsMovingAsync() As Task
    Return Task.Run(Sub() RunMoving())
End Function

Await should ideally be used to actually await a function if something is dependent on it finishing first.

Reference Async/Await - Best Practices in Asynchronous Programming

edited Feb 22, 2019 at 8:36

answered Feb 20, 2019 at 18:34

Nkosi

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1 Comment

video.baba Over a year ago

Private Function ... End Sub I guess that's a typo?

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