Save Data to Database using Dependency Injection & EF

[benny-adiwijaya]

Hi, I have problem when try to save data to database using dependency injection & EF in the event, this is my code

_driver.OnAfterUpload += async (sender, args) => { Console.WriteLine($"Uploaded to: {args.File.FullName}"); await _fileRepository.Create(new() { FullName = args.File.FullName }); };

So, is it possible to save data like this or there is another way?

[trannamtrung1st]

Hi there, what is the problem you are having?

On Sun, Feb 27, 2022, 01:28 benny-adiwijaya @.***> wrote:

Hi, I have problem when try to save data to database using dependency injection & EF in the event, this is my code

// Events _driver.OnAfterUpload += async (sender, args) => { Console.WriteLine($"Uploaded to: {args.File.FullName}"); await _fileRepository.Create(new() { FullName = args.File.FullName }); };

So, is it possible to save data like this or there is another way?

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[benny-adiwijaya]

I got exception "Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling 'Dispose' on the context instance, or wrapping it in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.\nObject name: 'ApplicationDbContext'."

I think this is because the method return type is async void instead async Task

[trannamtrung1st]

It is because the OnAfterload event is supposed to run synchronously. Making it async will result in the request completes then the context disposed before the event is called. I suggest not using async with EventHandler.

[trannamtrung1st]

Closed due to inactivity. Please reopen this issue if the problem persists.

[trannamtrung1st]

hi @benny-adiwijaya , you may want to take a look at #25.