c#语言简介_简单介绍自己

全栈程序员-站长 • 2022年9月25日下午2:16 • 未分类 • 阅读 3

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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>
/// This service is designed to return a TaskScheduler for application’s main, UI thread.
/// This service MUST be instantiated on UI thread.
/// </summary>
[DebuggerNonUserCode]
public class UITaskSchedulerService : IUITaskSchedulerService
{
private static readonly UITaskSchedulerService InstanceField = new UITaskSchedulerService();
private static readonly TaskScheduler TaskSchedulerUI;
private static readonly Thread GuiThread;
static UITaskSchedulerService()
{
GuiThread = Thread.CurrentThread;
TaskSchedulerUI = TaskScheduler.FromCurrentSynchronizationContext();
}
/// <summary>
/// Gets the instance.
/// </summary>
public static UITaskSchedulerService Instance
{
get
{
return InstanceField;
}
}
/// <summary>
/// Get TaskScheduler to schedule Tasks on UI thread.
/// </summary>
/// <returns>TaskScheduler to schedule Tasks on UI thread.</returns>
public TaskScheduler GetUITaskScheduler()
{
return TaskSchedulerUI;
}
/// <summary>
/// Check whether current tread is UI tread
/// </summary>
/// <returns><c>true</c>if current tread is UI tread.</returns>
public bool IsOnUIThread()
{
return GuiThread == 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 the TaskScheduler.FromCurrentSynchronizationContext. and from the TaskScheduler Class from MSDN, it retrieve the current thread’s synchronization context.

C#代码