Order of event handler execution

c# asynchronous event-handling
Phillip Ngan picture Phillip Ngan · Oct 29, 2009 · Viewed 47.5k times · Source

If I set up multiple event handlers, like so:

_webservice.RetrieveDataCompleted += ProcessData1;
_webservice.RetrieveDataCompleted += ProcessData2;

what order are the handlers run when the event RetrieveDataCompleted is fired? Are they run in the same thread and sequentially in the order that are registered?

Answer

Reed Copsey picture Reed Copsey · Oct 29, 2009

Currently, they are executed in the order they are registered. However, this is an implementation detail, and I would not rely on this behavior staying the same in future versions, since it is not required by specifications.

Related questions

How and when to use ‘async’ and ‘await’

From my understanding one of the main things that async and await do is to make code easy to write and read - but is using them equal to spawning background threads to perform long duration logic? I'm currently trying …

Read More
How would I run an async Task<T> method synchronously?

I'm learning about async/await, and ran into a situation where I need to call an async method synchronously. How can I do that? Async method: public async Task<Customers> GetCustomers() { return await Service.GetCustomersAsync(); } Normal usage: public …

Read More
async/await - when to return a Task vs void?

Under what scenarios would one want to use public async Task AsyncMethod(int num) instead of public async void AsyncMethod(int num) The only scenario that I can think of is if you need the task to be able to …

Read More