我有几个 Task
对象,例如 Task<int>
, Task<string>
, Task<double>
,我想按顺序运行。也就是说,随着每个任务完成,下一个任务会自动启动。每个任务都依赖于前一个任务的输出。
我该怎么做呢? myTask.ContinueWith(...) 重载都假定一个委托(delegate)参数。但是 Task 不是委托(delegate)。
最佳答案
你可以这样做:
var t1 = new Task(() => Console.WriteLine("Completed t1"));
var t2 = new Task(() => Console.WriteLine("Completed t2"));
var t3 = new Task(() => Console.WriteLine("Completed t3"));
t1.ContinueWith(t => t2.RunSynchronously())
.ContinueWith(t => t3.RunSynchronously());
t1.Start();
如果您不关心任务的结果,上面的示例仅适用。但是,如果您(如您的编辑状态)需要将每个任务的结果传递给下一个任务,那么您可以执行以下操作:
var t1 = new Task(() => Console.WriteLine("Completed t1"));
var t2 = new Task(() => Console.WriteLine("Completed t2"));
var t3 = new Task(() => Console.WriteLine("Completed t3"));
t1.ContinueWith(task1 =>
{
Console.WriteLine(task1.Result);
t2.ContinueWith(task2 =>
{
Console.WriteLine("{0} | {1}", task1.Result, task2.Result);
t3.ContinueWith(task3 =>
{
Console.WriteLine("{0} | {1} | {2}",
task1.Result, task2.Result, task3.Result);
});
t3.Start();
});
t2.Start();
});
t1.Start();
/* OUTPUT:
Completed t1
Completed t1 | Completed t2
Completed t1 | Completed t2 | Completed t3 */
关于c# - 对 .Net 任务进行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16868613/