Asynchronus coding question.

Question

Asynchronus coding question.

Dave Gray 586

Hello

Can anyone please tell me why the code on lines 7 & 9 does not get executed?

I'm basically pulling back a list of devices using the LogicMonitor SDK and there is no synchronous version of GetAllAsync (in the SDK) .

This is a cut-down version of my code in VS2022 which also does not execute after the line 5.

Is there a better/proper way to do this?

Thanks

AgaveJoe 31,361 Reputation points

2022-10-12T13:33:40.617+00:00
You did not tell us what framework you're targeting. I assume .NET Framework and not Core???

If so try removing the async from Main() and invoking the async method using the following pattern.

var results = GetDevicesAsync().GetAwaiter().GetResult();
Dave Gray 586 Reputation points

2022-10-12T15:46:08.873+00:00

Hi,
In production it is .NET 6.0, my sandpit screenshot was taken from LINQPad 6 which I assume is core, but you don't get to chose AFAIK.

Since posting I made the example more reflective of the production (BL+DAL) and added .Result on lines 4 and 16, this also seems to work. I chnaged Main()
as you suggested and it all works.

I can now break at line 6 and step thru my loop.

Asked a colleague about this and he said Task.Run is kind of obsolete now and I need to read up on Task.Factory

Thanks
Dave Gray 586 Reputation points

2022-10-12T15:49:53.743+00:00

Screenshot below as I could not seem to post to your reply.
AgaveJoe 31,361 Reputation points

2022-10-12T17:00:26.34+00:00

In production it is .NET 6.0,

something is still not quite right with your response and we have no idea what kind of application you're building. Task.Run and Task.Factory both are used to schedule a task to run. Why it is necessary to manually schedule a task is not clear. If you just trying to get something to run then you might want to learn asynchronous programming first.

Typically when writing code that follows the async/await (TAP) pattern, async methods from top to bottom are the goal. Otherwise wasting system resources is a possibility. This is especially important in web development.

Asynchronous programming with async and await
What happens in an async method

Answer accepted by question author

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Your answer

AgaveJoe 31,361 Reputation points

2022-10-12T13:33:40.617+00:00

You did not tell us what framework you're targeting. I assume .NET Framework and not Core???

If so try removing the async from Main() and invoking the async method using the following pattern.

var results = GetDevicesAsync().GetAwaiter().GetResult();
Dave Gray 586 Reputation points

2022-10-12T15:46:08.873+00:00

Hi,
In production it is .NET 6.0, my sandpit screenshot was taken from LINQPad 6 which I assume is core, but you don't get to chose AFAIK.

Since posting I made the example more reflective of the production (BL+DAL) and added .Result on lines 4 and 16, this also seems to work. I chnaged Main()
as you suggested and it all works.

I can now break at line 6 and step thru my loop.

Asked a colleague about this and he said Task.Run is kind of obsolete now and I need to read up on Task.Factory

Thanks
Dave Gray 586 Reputation points

2022-10-12T15:49:53.743+00:00

Screenshot below as I could not seem to post to your reply.
AgaveJoe 31,361 Reputation points

2022-10-12T17:00:26.34+00:00

In production it is .NET 6.0,

something is still not quite right with your response and we have no idea what kind of application you're building. Task.Run and Task.Factory both are used to schedule a task to run. Why it is necessary to manually schedule a task is not clear. If you just trying to get something to run then you might want to learn asynchronous programming first.

Typically when writing code that follows the async/await (TAP) pattern, async methods from top to bottom are the goal. Otherwise wasting system resources is a possibility. This is especially important in web development.

Asynchronous programming with async and await
What happens in an async method

Answer 1

João Ludovico 81

Hi,

You can do this on line 3:

List<Device> devices = await GetDevices();

Then you don't need line 4 and simple have:

 Console.WriteLine(devices.GetType());  
  
Console.WriteLine("Hello");

I think this should work.

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Answer 2

Dave Gray 586

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Asynchronus coding question.

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