C# Async.

How a C# program waits: tasks, awaiting, cancellation, and the failures each shape produces. Covers 10 sub-skills.

• C# Async · 1 of 3

  Tasks

  What three ends can a task reach?

  Afailed, waiting or stoppedBdone, waiting or stoppedCdone, failed or stoppedDdone, failed or waiting

• C# Async · 2 of 3

  Coordination

  Why can a lock body not await?

  Athat same holder would vanish under itBthe holder would change under itCthe body would run twice overDthe body would never run at all

• C# Async · 3 of 3

  Deadlocks

  A lock is held across a call that waits on other work. What does the measurement show can follow?

  var a = new object(); var b = new object();bool tookBoth = false;lock (a){    var other = Task.Run(() => { lock (b) { return Monitor.TryEnter(a, 200); } });    tookBoth = other.Result;}Console.WriteLine($"{tookBoth} done");

  Aa second holder allowed at its limitBa first holder allowed at its limitCa second holder refused at its limitDone whole first holder refused at its limit