C# Why is there no implementation for GetAwaiter (StorageFile) when using method CreateFileAsync?

Question

I tried to make use of SQLite in C# like here. In the step "Initialize the SQLite database" I get the problem for the line

await ApplicationData.Current.LocalFolder.CreateFileAsync("sqliteSample.db", CreationCollisionOption.OpenIfExists);

because:

Error CS4036 'IAsyncOperation<StorageFile>' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'IAsyncOperation<StorageFile>' could be found (are you missing a using directive for 'System'?

I am using System; already. Any idea how to fix it?

What happens if you do `await CreateFileAsync(whatever).AsTask();` ? That's an extension in `System.Threading.Tasks` — Eric Lippert, Feb 09 '20 at 16:48
it tells me that there is no implementation and it could miss a using directive or assembly reference — NullOrNotNull, Feb 09 '20 at 16:53
And are you missing the using directive or assembly reference? — Eric Lippert, Feb 09 '20 at 16:54
I dont know to be honest - it doesn't tell which directive or assembly reference could be missing. — NullOrNotNull, Feb 09 '20 at 16:58
As I said **it is an extension method in `System.Threading.Tasks`.** — Eric Lippert, Feb 09 '20 at 16:59
Where is the file located (sqliteSample.db)? The code expects it to be in the Current LocalFolder. — jdweng, Feb 09 '20 at 16:59
Eric: I declared `using System.Threading.Tasks;` at the top. It is marked as unused and the AsTask is marked with the error I mentioned. jdweng: The file doesn't exist yet. I can't even compile the programm because of the error. — NullOrNotNull, Feb 09 '20 at 17:03
@NullOrNotNull You probably miss System.Threading.Tasks. Please check here https://www.nuget.org/packages/System.Threading.Tasks/ how you can install it. — Christos, Feb 09 '20 at 17:22
Does this answer your question? [IAsyncOperation>' does not contain a definition for 'GetAwaiter'](https://stackoverflow.com/questions/54515716/iasyncoperationireadonlylistusernotification-does-not-contain-a-definition) — devNull, Feb 09 '20 at 17:45

C# Why is there no implementation for GetAwaiter (StorageFile) when using method CreateFileAsync?

0 Answers0