c# - A good solution for await in try/catch/finally? -

i need call async method in catch block before throwing again exception (with stack trace) :

try {     // } catch {     // <- clean things here async methods     throw; } 

but unfortunately can't use await in catch or finally block. learned it's because compiler doesn't have way go in catch block execute after await instruction or that...

i tried use task.wait() replace await , got deadlock. searched on web how avoid , found this site.

since can't change async methods nor know if use configureawait(false), created these methods take func<task> starts async method once on different thread (to avoid deadlock) , waits completion:

public static void awaittasksync(func<task> action) {     task.run(async () => await action().configureawait(false)).wait(); }  public static tresult awaittasksync<tresult>(func<task<tresult>> action) {     return task.run(async () => await action().configureawait(false)).result; }  public static void awaitsync(func<iasyncaction> action) {     awaittasksync(() => action().astask()); }  public static tresult awaitsync<tresult>(func<iasyncoperation<tresult>> action) {     return awaittasksync(() => action().astask()); } 

so questions is: think code okay?

of course, if have enhancements or know better approach, i'm listening! :)

you can move logic outside of catch block , rethrow exception after, if needed, using exceptiondispatchinfo.

static async task f() {     exceptiondispatchinfo capturedexception = null;     try     {         await taskthatfails();     }     catch (myexception ex)     {         capturedexception = exceptiondispatchinfo.capture(ex);     }      if (capturedexception != null)     {         await exceptionhandler();          capturedexception.throw();     } } 

this way, when caller inspects exception's stacktrace property, still records inside taskthatfails thrown.