c# - What's The Actual Difference Between await XXAsync() And await Task.Run(()=>{XX() } -

by using task.run or task.factory.startnew can convert synchronous actions tasks, can use await, this:

await task.run(() => { somemethod(); } 

in meantime, many methods have asynchronous implements, recommended directly use

await somemethodasync(); 

but what's difference between two?

somemethodasync method io work , io work not require thread work. somemethodasync not cause thread thread-pool sit , wait complete. thread-pool threads important resources in server application such asp.net applications. in such applications, each request serviced thread-pool thread , number of active requests can increased saving such threads.

await task.run(() => { somemethod(); } uses thread-pool thread execute somemethod method. if somemethod io work, used thread-pool thread unnecessarily.