static Task <string> Hello()
{
MyStateMachine machine = new MyStateMachine();
machine.t_builder = AsyncTaskMethodBuilder <string> .Create();
//TaskCompletionSource
machine.state = -1;
var t_builder = machine.t_builder;
t_builder.Start(ref machine);
return(machine.t_builder.Task);
}
public void MoveNext()
{
try
{
switch (state)
{
case -1:
Console.WriteLine("hello world");
var waiter = Task.Run(() =>
{
Console.WriteLine("i'm middle");
return("i'm ok");
}).GetAwaiter();
state = 0; //设置下一个状态
myawaiter = waiter;
machine = this;
//丢给线程池执行了。。。
t_builder.AwaitUnsafeOnCompleted(ref waiter, ref machine);
break;
case 0:
var j = myawaiter.GetResult();
Console.WriteLine("我是结尾哦:{0}", j);
t_builder.SetResult(j);
break;
}
}
catch (Exception ex)
{
t_builder.SetException(ex); //设置t_builder的异常
}
}