UnauthorizedAccessException on MemoryMappedFile in C# 4

Question

I wanted to play around with using a MemoryMappedFile to access an existing binary file. If this even at all possible or am I a crazy person?

The idea would be to ma

Answer 1

I know this is an old question, but I just ran into the same error and was able to solve it.

Even though I was opening the MemoryMappedFile as read-only (MemoryMappedFileRights.Read) as you are, I also needed to create the view accessor as read-only as well:

var view = mmf.CreateViewAccessor(offset, size, MemoryMappedFileAccess.Read);

Then it worked. Hope this helps someone else.