问题描述
我有一个任务列表,我想等待.我在等待
I have a list of tasks, which i'd like to wait for. I'm waiting like
await TaskEx.WhenAll(MyViewModel.GetListOfTasks().ToArray());
MyViewModel.GetListOfTasks()返回任务列表:
MyViewModel.GetListOfTasks() returns List of Task:
var tasksList = new List<Task>();
foreach (var item in Items)
{
tasksList.Add(item.MyTask());
}
现在,我想返回虚拟任务,该任务将立即完成.但是,TaskEx.WhenAll会永远等待它:
Now, i'd like to return dummy task, which would be done immediately. However, TaskEx.WhenAll would wait it forever:
public Task<bool> MyTask()
{
return new Task<bool>(() => false);
}
我该如何退回立即完成的Task?
How can i return Task, which would be finished instantly?
推荐答案
在.NET 4.5中,您可以使用FromResult立即返回任务结果.
in .NET 4.5 you can use FromResult to immediately return a result for your task.
public Task<bool> MyTask()
{
return TaskEx.FromResult(false);
}
http://msdn.microsoft. com/en-us/library/hh228607%28v = vs.110%29.aspx
对于Windows Phone 8.1及更高版本, API已被合并以与其他平台保持一致:
For Windows Phone 8.1 and higher, the API has been merged to be consistent with other platforms:
public Task<bool> MyTask()
{
return Task.FromResult(false);
}
这篇关于返回任务< bool>即刻的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!