Running several EntityFramework database queries in parallel

Question

I am trying to run 3 database queries in parallel but I\'m not sure that I am doing it correctly.

I have made 3 functions which each make a query to the database.

Answer 1

No they run one after eachother if you call them like that using await foreach method, it will run first method, then the second one...etc. And the last part await Task.WhenAll(), you did not supplied the tasks to wait for completion.

To run them in parallel you have to do it like this:

var TaskAccountCode = getAccountCodeAsync(deviceId);
var TaskDeviceType = getDeviceTypeAsync(deviceId);
var TaskUsername = getUserNameAsync(userId);
await Task.WhenAll(TaskAccountCode, TaskDeviceType,TaskUsername);