[英]Parallel.ForEach with conditions
I have list of objects. 我有对象清单。 Object is instance of class.
对象是类的实例。 Inside each object is property that hold some value:
每个对象内部都有一些值的属性:
List<SomeClassTask> lstSomeTaskList = new List<SomeClassTask>();
for (int i=0; i<5; i++)
{
SomeClassTask tsk = new SomeClassTask();
Thread.Sleep(500);
tsk.SomeProperty = new Random().Next(1, 11);
lstSomeTaskList.Add(tsk);
}
The next step is to run parallel task for each object 下一步是为每个对象运行并行任务
Parallel.ForEach(lstSomeTaskList, task => task.StartProcessing(task.SomeProperty));
I want to start only specific tasks like task which has value 1 (SomeProperty = 1). 我只想启动特定任务,例如具有值1(SomeProperty = 1)的任务。
This is class: 这是课程:
class SomeClassTask
{
public int SomeProperty { get; set; }
public void StartProcessing(int maxRange)
{
int rnd = new Random().Next(1, maxRange);
Thread.Sleep(1000);
Console.WriteLine("Parallel task -> radnom created value: " + rnd);
}
}
Is it possible inside 里面可能吗
Parallel.ForEach
Parallel.ForEach
put some conditions to check some object properties? 放一些条件检查一些对象属性?
Parallel.ForEach
Gets a IEnummerable
as Source, so you just need to filter your list object and feed it to the ForEach, something like: Parallel.ForEach
获取IEnummerable
作为源,因此您只需要过滤列表对象并将其提供给ForEach,例如:
SomeClassTask a = new SomeClassTask { SomeProperty = 1 };
SomeClassTask b = new SomeClassTask { SomeProperty = 2 };
List<SomeClassTask> lstSomeTaskList = new List<SomeClassTask> { a, b };
Parallel.ForEach(lstSomeTaskList.Where(task => task.SomeProperty == 1),
task => task.StartProcessing(task.SomeProperty));
Edit 编辑
As the comments has pointed out already, you should check this -> https://codeblog.jonskeet.uk/2009/11/04/revisiting-randomness/ 正如评论已经指出的那样,您应该检查一下-> https://codeblog.jonskeet.uk/2009/11/04/revisiting-randomness/
You should use Microsoft's Reactive Framework (aka Rx) - NuGet System.Reactive
and add using System.Reactive.Linq;
您应该使用Microsoft的Reactive Framework(aka Rx)-NuGet
System.Reactive
并using System.Reactive.Linq;
添加using System.Reactive.Linq;
- then you can do this: -那么您可以执行以下操作:
IObservable<SomeClassTask> query =
from i in Observable.Range(0, 5)
let tsk = new SomeClassTask() { SomeProperty = _random.Next(1, 11) }
where tsk.SomeProperty == 1
from u in Observable.Start(() => tsk.StartProcessing(tsk.SomeProperty))
select tsk;
IDisposable subscription = query.Subscribe();
Now, if you want all of the results when the query has finished then do this: 现在,如果要在查询完成后获得所有结果,请执行以下操作:
IDisposable subscription =
query
.ToList()
.Subscribe(list => { /* use `list` here */ });
If you need to finish process before it completes then just do subscription.Dispose();
如果您需要在完成之前完成流程,则只需进行
subscription.Dispose();
. 。
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