CODEWITHSUNDEEP
c#asynchronousasync-await
Fka
Fka

Reputation: 6234

C# async, await

I have simple code which I want to be executed asynchrounously:

public async Task EncryptAsync()
{
    for (int i = 0; i < 10; i++)
    {
        // shift bytes
        // column multiplication
        // and so on
    }
}

That is the way I call above method:

private async void Encryption()
{
    ShowBusyIndicator();

    await encryptor.EncryptAsync();

    HideBusyIndicator();
}

The point is, when I add await Task.Delay(1000); in this method, busi indicator is shown, but after 1 sec, application locks and waits SYNCHRONOUSLY for encryption complete. If I remove Task.Delay, application lock and unlocks after operation finished.

How to use properly await and asyc in my case? I want simply execute method encryptor.EncryptAsync() asynchronously.

Upvotes: 1

Views: 271

Answers (1)

SLaks
SLaks

Reputation: 888077

The async / await keywords do not allow you to create new asynchrony; instead, they simply allow you to wait for an existing asynchronous operation to complete.

You want to run your CPU-bound operation on a background thread to avoid blocking the UI.
To do that, call the synchronous blocking method inside a lambda passed to Task.Run().

You can then use await to wait for the resulting asynchronous operation (a Task instance).

Upvotes: 4

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