如下的代码是关于C# Async Await用法演示的代码，希望对码农也有用处。
public void Main()
{
var result = LaunchTasks(new List<int>() { 5, 3 });
Debug.WriteLine("The final result is {0}",result.Result);
}
public async Task<bool> LaunchTasks(List<int> waitTimes)
{
bool result = false;
List<Task> tasks = new List<Task>();
try
{
foreach (int wait in waitTimes)
{
var task1 = FirstWait(wait);
tasks.Add(task1);
var task2 = SecondWait(wait);
tasks.Add(task2);
}
Debug.WriteLine("About to await on {0} Tasks", tasks.Count);
await Task.WhenAll(tasks);
Debug.WriteLine("After WhenAll");
}
catch (Exception ex)
{
}
return result;
}
private async Task<bool> FirstWait(int waitTime)
{
var task = Task.Factory.StartNew<bool>((delay) =>
{
try
{
int count = (int)delay;
for (int i = 0; i < count; i++)
{
Debug.WriteLine("FirstWait is at {0}", i);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
return true;
}, waitTime);
await Task.WhenAll(task);
Debug.WriteLine("After FirstWait");
return task.Result;
}
private async Task<bool> SecondWait(int waitTime)
{
var task = Task.Factory.StartNew<bool>((delay) =>
{
try
{
int count = (int)delay;
for (int i = 0; i < count; i++)
{
Debug.WriteLine("SecondWait is at {0}", i);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
return true;
}, waitTime);
await Task.WhenAll(task);
Debug.WriteLine("After SecondWait");
return task.Result;
}
