1. ToLookup && ToLookDictionary

http://www.cnblogs.com/huangxincheng/p/3618872.html

2. ParallelEnumerable

https://msdn.microsoft.com/zh-cn/library/windows/apps/system.linq.parallelenumerable.aspx

3. ConcurrentDictionary

http://www.tuicool.com/articles/vaeiie

http://www.cnblogs.com/lori/p/4344026.html

http://www.cnblogs.com/hiflora/p/4313510.html

https://msdn.microsoft.com/zh-cn/library/dd287191.aspx

http://www.cnblogs.com/PurpleTide/archive/2011/11/21/2256577.html

4. ConcurrentStack

https://msdn.microsoft.com/zh-cn/library/dd267331(v=vs.110).aspx

5. Task

http://www.cnblogs.com/czllfy/archive/2011/04/15/2016733.html