[英]How to handle/implement multiple Tasks in C#
我有必须执行大型计算任务的项目列表,因此我实现了类似以下内容的项目。 如果我在这里做错了任何事情,请告诉我。
{
"MainList": [{
"Name": "First item from root task",
"Task": [{
"SubTask1": "...",
"SubTask2": "..."
}]
},
{
"Name": "Second item from root task",
"Task": [{
"SubTask1": "...",
"SubTask2": "...",
"SubTask3": "...",
"SubTask4": "..."
}]
}
]
}
场景:
请注意,STEP 2中的两个任务都必须在第一个任务完成后执行,然后这两个任务都可以执行并行处理。
考虑到以上情况,我开发了如下代码:
码:
List<Task<object>> mainFirstTaskList = new List<Task<object>>();
List<Task<object>> mainSecondTaskList = new List<Task<object>>();
List<Task> subTaskList = new List<Task>();
foreach (var itm in MainList)
{
mainFirstTaskList.Add(Task.Factory.StartNew<object>(() =>
{
//Use "itm" from iteration
//Perform big computational task on each item
return resultFirstMainList;
}));
}
while (mainFirstTaskList.Count > 0)
{
int finishedTask = Task.WaitAny(mainFirstTaskList.ToArray()); //waiting for any of the task to gets complete
Task<object> t = mainFirstTaskList[finishedTask];
var result = t.Result;
//Perform Another Task on the same list
mainSecondTaskList.Add(Task.Factory.StartNew<object>(() =>
{
//use result from first task completed
//Perform big computational task on each item
return resultSecondMainList;
}));
//Perform the task on sub item list
subTaskList.Add(Task.Factory.StartNew<object>(() =>
{
//Have used Parallel.For to partition the sub task computation
//And have added this Parallel.For inside another Task, as Parallel.For will partition the tasks on current thread
Parallel.For(1, subItemIndex, i =>
{
//Perform big task computation
});
}));
}
如果我在这里做错了什么,请告诉我。
提前致谢!!!
我想我大致了解您在做什么。 您应该为此使用Microsoft的Reactive Framework。 然后,您可以执行以下操作:
var query =
from mainItem in MainList.ToObservable()
from firstResult in Observable.Start(() => ProcessMainItem(mainItem))
from secondResult in Observable.Start(() => ProcessFirstItem(firstResult))
from subItem in secondResult.ToObservable()
from result in Observable.Start(() => ProcessSubItem(subItem))
select result;
IDisposable subscription =
query
.Subscribe(x =>
{
/* Process results as they are computed */
});
每次计算都是并行进行的,并且将结果汇总到最终结果中。
您甚至可以select new { mainItem, firstResult, secondResult, subItem, result };
一个select new { mainItem, firstResult, secondResult, subItem, result };
如果您想将所有中间结果联系在一起。
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