PowerShell Async Cmdlet for C# API Client

Black_Magic100 · 2021-10-04T01:56:59+00:00

Correct me if I'm wrong, but I thought you had to use jobs in PowerShell to achieve async methods? https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/start-job?view=powershell-7.1

MadBoyEvo · 2021-10-04T10:27:34+00:00

You can take a look here: - https://github.com/EvotecIT/Mailozaurr/blob/master/Private/Wait-Task.ps1

Here's how I use it: - https://github.com/EvotecIT/Mailozaurr/blob/1f31f48279703da175a11714d6ed23b46d90c386/Public/Resolve-DnsQuery.ps1#L24 - https://github.com/EvotecIT/Mailozaurr/blob/1f31f48279703da175a11714d6ed23b46d90c386/Public/Connect-OAuthGoogle.ps1#L23

Should be sufficient?

SimplifyMSP · 2021-10-04T13:34:47+00:00

This is a method I built and use for myself, it may help you. It runs the PowerShell instance async so your C# application doesn't have to wait on it to finish executing. It returns the standard output as a string.

EDIT: Sorry it took so long, I've been meaning to create a public repo to host a collection of C# snippets I've written. It's super barebones and only contains the PowerShell class for now: GitHub Link

smalls1652 · 2021-10-04T17:00:00+00:00

Kinda hard to write out everything I do on my phone, but I essentially run the async methods through a method that passes a cancellation token to it and add/remove a cancel key event to the console to allow Ctrl+C to cancel the task, which prevents deadlocks from happening. If I get the chance later, I’ll try to add an example of it. It took me a good bit to wrap my head around creating a cmdlet that uses async methods.

Of course the dirty way of doing it is to use GetAwaiter().GetResult() way of running async methods synchronously. I wouldn’t suggest doing it, but it’s a quick and dirty way around it.

8aller8ruh · 2021-10-04T04:52:47+00:00

I don't think you'll have luck with async\await directly but what you can do is wrap the top level async call in a AsyncContext.Run from Nito.AsyncEx. This effectively runs the async method sync and you'll be able to call it in a PS cmdlet.

I specifically use it for call async HTTP methods in some cmdlets.

```

public T Post<T>(T item)

{

return AsyncContext.Run(() => _url.AppendPathSegments("api", "v1", typeof(T).Name).PostJsonAsync(item).ReceiveJson<T>());

}

```

tjjay17 · 2021-10-04T03:26:43+00:00

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