Loop through synchronous list in asynchronous function

Question

Hi,

How can to loop through a synchronous list in an asynchronous function ?

 private  void Button_Clicked(object sender, EventArgs e)  
    {  
        FirebaseHelper firebaseHelper = new FirebaseHelper();  
        var books = firebaseHelper.GetAllBooksAsync();  
        foreach (var book in await books)     // CS4033  
        {  
            Debug.WriteLine(book.Title);  
  
        }  
    }  

I don't want to use await and the function must be asynchronous.
Thank you in advance.

Answer 1

You can try the code below:

private void Button_Clicked(object sender, EventArgs e)  
{  
    Task.Run(() =>  
    {  
        FirebaseHelper firebaseHelper = new FirebaseHelper();  
        var books = firebaseHelper.GetAllBooksAsync();  
        foreach (var book in books)     // CS4033  
        {  
            Debug.WriteLine(book.Title);  
        }  
    });  
}  

If right, please accept.
Enjoy Programming!!!

Answer 2

@Yusuf , you could try to use Task<TResult>.Result Property to get list from the Task.

Here is a code example you could refer to.

private  void Button_Clicked(object sender, EventArgs e)  
    {  
        FirebaseHelper firebaseHelper = new FirebaseHelper();  
        var books = firebaseHelper.GetAllBooksAsync();  
        foreach (var book in  books.Result)     // change books to books.Result  
        {  
            Debug.WriteLine(book.Title);  
  
        }  
    }  

Best Regards,
Jack

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Answer 3

Thanks @Jack J Jun , the error has been solved but now the runtime error is happening.

The thread 0x37c0 has exited with code 0 (0x0).

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output:
file:https://github.com/devenv2/MauiApp5/blob/master/MauiApp5/TextFile1.txt