Calling await on the task directly. C#

Question

I am learning await/async right now. and I have a question: Is there a difference between calling the await directly on the task and call it later?

var task = getAllAsync();
...
var list = await task;

OR

var list = await getAllAsync();

If there is a difference, what is it?

https://stackoverflow.com/questions/9519414/whats-the-difference-between-task-start-wait-and-async-await — tjugg, Aug 28 '17 at 19:00
There is no real practical difference... you just introduced an intermediate variable in one case... — Jeff Mercado, Aug 28 '17 at 19:01
There's only a difference if there's code between the assignment and the `await`. — juharr, Aug 28 '17 at 19:02

score 4 · Accepted Answer · answered Aug 28 '17 at 19:22

If you await immediately after assigning "task" to a variable there is no difference. If you have code between method call and await-ing you have chance to execute operations in parallel.

Most tasks are created "hot" - they already have started operation (like reading file). As result if you have some code before await that code may execute while operation started by task is going on separately. I.e. you can start multiple tasks and than wait for all of them to complete - Running multiple async tasks and waiting for them all to complete.

Calling await on the task directly. C#

1 Answers1