WCF在调用之间共享变量

Question

I have a wcf web service which i want to share information between calls (diferent clients calls) .

for example sharing a dictionary between client calls. the dictionary can be change through calls (add/remove item etc) but i cant efford it to be deleted or to be renew for each call (it should be like a static database) .

is there any way to implement this issue?

allready tried a few suggestions but nothing realy seems to work.

Answer 1

You basically need a singleton defined outside of your service class - you would need to handle the very likely possibility that multiple calls will be accessing / modifying the info at the same time so will need to lock the data maybe with a ReaderWriteLock or ReaderWriterLockSlim .

A nicer way of doing it, assuming you are using .net 4.0, would be to use MemoryCache , which contains built-in thread safety. If you are pre .net 4.0, there is a cache object in the System.Web namespace link - it was a bit of a pain having to add reference to system.web if you wanted to use it when writing windows apps so the MemoryCache implementation in .net 4.0 was a welcome addition.