Did you know that the .NET compiler turns our async methods into classes? And that .NET adds a try/catch block to each of these classes, potentially hiding thrown exceptions? It's true!

1. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

2. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}

3. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 1

4. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 2*
*Can be any thread other than Thread 1
e.g. Thread 32

5. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 1

6. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 5*
*Can be any thread other than Thread 1
e.g. Thread 32

7. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 1

8. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 17*
*Can be any thread other than Thread 1
e.g. Thread 32

9. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
GetLibraries
public async Task<List<LibraryModel>> GetLibraries()
{
var response = await httpClient.GetAsync("https://codeTraveler.io/MauiLibraries");
response.EnsureSuccessStatusCode();
var stream = await response.Content.ReadAsStreamAsync();
var libraries = await JsonSerializer.DeserializeAsync<List<LibraryModel>>(stream);
return libraries ?? throw new InvalidOperationException("Libraries cannot be null");
}
Thread 1

10. Compiler
Generated
Code

11. Quick Review

12. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
*Release Configuration

13. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

14. Let’s Fix Some
Code

15. Async/Await
Best Practices

16. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

17. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

18. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

19. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

20. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
• `ConfigureAwaitOptions.ContinueOnCapturedContext`
• `ConfigureAwaitOptions.ForceYielding`
• Forces an await on an already completed Task
• Behave as if the Task wasn't yet completed
• `ConfigureAwaitOptions.SuppressThrowing`
• Suppresses exception on faulted Task
• `ConfigureAwaitOptions.None`
• Will not return to the calling thread
*Enums can be combined together

21. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

22. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

23. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

24. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

25. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/

26. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
https://codetraveler.io/AsyncAwaitBestPractices/

27. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/
https://codetraveler.io/AsyncAwaitBestPractices/

28. @TheCodeTraveler https://codetraveler.io/AsyncAwaitBestPractices/