WPF Dispatcher using PriorityQueue

I am sure everyone using WPF know about Dispacther and how it works but i was more curious to see how it implementes the work prioritization. So i opened the Reflector and disassembled the System.Windows.Threading dll.

private PriorityQueue PriorityQueue();

For people who do not know about PriorityQueues please visit http://en.wikipedia.org/wiki/PriorityQueue

The best part about the priority queues is that user can tell execution of which workitem is more important than the other.

Microsoft should have exposed the PriorityQueue they have implemented to the developers in the collections namespace, reason being lot of realtime systems use priority queues.

Dispacther class uses following enumeration for prioritization.

public enumDispatcherPriority
ApplicationIdle = 2,
Background = 4,
ContextIdle = 3,
DataBind = 8,
Inactive = 0,
Input = 5,
Invalid = -1,
Loaded = 6,
Normal = 9,
Render = 7,
Send = 10,
SystemIdle = 1


Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s