C#

2019-11-17 03:07:19

字体：大中小

来源：转载

供稿：网友

C# - 简单介绍TaskScheduler

task Scheduler根据定义

The task Scheduler by the definition blurb.

“Is the class where the usage context is within the task libraries. “

它的作用像是WPF/Winform时代的SynchronizationContext.

It is like the Synchronization context in the cross WPF/Win forms era.

像SynchronizationContext.一样，TaskScheduler也有可能依赖特定的UI SynchronizationContext.

As with the Synchronization context, we may have requirement for like the UI context synchronization.

代码如下:

Give the code as below.

C#代码

///<summary>
///ThisserviceisdesignedtoreturnaTaskSchedulerforapplication'smain,UIthread.
///ThisserviceMUSTbeinstantiatedonUIthread.
///</summary>
[DebuggerNonUserCode]
publicclassUITaskSchedulerService:IUITaskSchedulerService
{
PRivatestaticreadonlyUITaskSchedulerServiceInstanceField=newUITaskSchedulerService();
privatestaticreadonlyTaskSchedulerTaskSchedulerUI;
privatestaticreadonlyThreadGuiThread;
staticUITaskSchedulerService()
{
GuiThread=Thread.CurrentThread;
TaskSchedulerUI=TaskScheduler.FromCurrentSynchronizationContext();
}
///<summary>
///Getstheinstance.
///</summary>
publicstaticUITaskSchedulerServiceInstance
{
get
{
returnInstanceField;
}
}
///<summary>
///GetTaskSchedulertoscheduleTasksonUIthread.
///</summary>
///<returns>TaskSchedulertoscheduleTasksonUIthread.</returns>
publicTaskSchedulerGetUITaskScheduler()
{
returnTaskSchedulerUI;
}
///<summary>
///CheckwhethercurrenttreadisUItread
///</summary>
///<returns><c>true</c>ifcurrenttreadisUItread.</returns>
publicboolIsOnUIThread()
{
returnGuiThread==Thread.CurrentThread;
}
}

该class的要求是必须在UI thread初始化。

The requirement for the UITaskShcedulerService is that you should construct the singleton instance to start from a UI threads.

因为他内部使用的是TaskScheduler.FromCurrentSynchronizationContext，根据MSDN的TaskScheduler Class定义，它拿到的是当前thread的synchronization context

Because it internally use theTaskScheduler.FromCurrentSynchronizationContext. and from theTaskScheduler Classfrom MSDN, it retrieve the current thread’s synchronization context.

C#代码