HttpRuntime Cache vs. static dictionary/fields

Question

What are the main pros and cons for using HttpRuntime Cache against using simple static field?

I need to store data in scope of entire

Answer 1

with the cache you can easily set an enddate to the validity; the cache object expires the content automaticly.

also the cache can be given a priority, that less important items can be given a low priority so when the server gets high load, that item is removed first

with cahce however you allways have to do some extra effort in your unit test because the httpcontext isn't available during unit tests.