How to do this without lambda?

Question

Public Shared Async Function getMarketDetailFromAllExchangesAsync() As Task
    Dim taskList = New List(Of Task)
    Dim starttime = jsonHelper.currentTimeStamp
    LogEvents("Start Getting Market Detail of All")
    For Each account In uniqueAccounts().Values
        Dim newtask = account.getMarketInfoAsync().ContinueWith(Sub() account.LogFinishTask("GetMarketDetail", starttime))
        taskList.Add(newtask)
        'newtask.ContinueWith(Sub() LogEvents(account.ToString))
    Next
    Await Task.WhenAll(taskList.ToArray)
    Dim b = 1
End Function

Is there a way to do .ContinueWith(Sub() account.LogFinishTask("GetMarketDetail", starttime)) with addressOf instead?

How?

Not if your method requires more than one parameter (and creating another method is not an option). But why do you even want to get rid of the lambda? — Visual Vincent, Apr 28 '19 at 17:29
Possible duplicate of [AddressOf with parameter](https://stackoverflow.com/questions/9143385/addressof-with-parameter) — 41686d6564 stands w. Palestine, Apr 28 '19 at 17:38
You can define an Action somewhere else. Which is usually implemented with a Lambda :) — Jimi, Apr 28 '19 at 17:40
Kindly, try to choose better/meaningful titles for [your questions](https://stackoverflow.com/q/55883154/4934172) :) — 41686d6564 stands w. Palestine, Apr 28 '19 at 17:40
I think that one solve my problem. However, this question should stay. It's more clear. The other one is for handler. — user4951, Apr 29 '19 at 11:03

score 1 · Answer 1 · answered Apr 28 '19 at 17:57

1

You need to create a method which satisfies any of existed ContinueWith overloads.
In your particular case it should satisfy a signature of Action(Of Task).

But because in ConitnuesWith you are using account instance, you will not be able to use AddressOf with method of the class where loop is executed.

As workaround you can create required method in class of account

Public Class Account
    Public Sub LogFinishedMarketDetail(task As Task)
        Dim starttime = jsonHelper.currentTimeStamp
        Me.LogFinishTask("GetMarketDetail, starttime")
    End Sub
End Class

Usage

For Each account In uniqueAccounts().Values
    Dim newtask = 
        account.getMarketInfoAsync().ContinueWith(AddressOf account.LogFinishedMarketDetail)
    taskList.Add(newtask)
Next

Suggestion - set Option Strict to On - will saves developer time by displaying possibly errors during compile time, instead of run-time.

answered Apr 28 '19 at 17:57

Fabio

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I want to pass on more parameters than just the task. In fact, the task is not needed at all. – user4951 Apr 29 '19 at 10:33
@user4951, that was my point, if you want to use a method which has different signature then lambdas accepted by `ContinueWith`, you should wrap your method with another which will have accepted signature. – Fabio Apr 29 '19 at 19:09
`Option Strict On` will make your life much easier, because it will point you into possible type/signature problems much early and saves your time. For example with `Option String On` your code will not compile, because there are no `ContinueWith` overload which accepts `Action` as an argument – Fabio Apr 29 '19 at 19:11

How to do this without lambda?

1 Answers1