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How to monitor file changes in Asp.net

Source: Internet
Author: User
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The problem is:
We now put the resource file in an XML file, each time ProgramRead Memory at startup [web site]
Added a hash table, but when the program runs, if the user modifies the content of this resource file
So what should we do? How should the program know?
I found a Watcher's calss, but it seems that no one has done anything with it.
Who has experience in this area, please explain, we need to do that to Web. config
The system will be ready for every change. I don't think the system will perform I/O operations on him every time.

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