调试异步堆栈的预期方法-发生了什么？

Question

I have a method that inconsistently fails, therefore I can't replicate with any certainty.

I've captured the stacktrace and exception of one of these failures (below). Usually this would just be a case of exploring the stack to understand how the code got to it's current state.

However since the method is marked async the stack trace makes no sense .

I'd love to be able to check what the various variables were set to. Does anyone have any hints / tips / proven ways of working with an async stack so I can get the root of my issue?

Object reference not set to an instance of an object.

Answer 1

You may use Async Diagnostics library together with PostSharp to get logical stack. See the article Async Diagnostics blog post

Answer 2

The stacktrace is usually not usable in async code because it will just tell you that the call to some async method has fail. Neither is the debug step by step, because if it is hard to reproduce, it is probably a timing error and you will never reproduce it in debug.

Instead use try/catch and check the aggregate exception. Be sure that your method return a Task, and that this Task is awaited, or you won't catch anything.

I think this MSDN documentation will help you to catch your error correctly.