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How do you check to se if a user has read permissions for a file in windows? There is the possibility to read the authorization rules via File.GetAccessControl. This does not tell me if the user has the right to read the file through group membership…
Read the file. If you can read it, you have permission.
This is actually the intended model here. Even if you check the permissions before trying to read, there is the possibility that they will change before you get to your read. You are supposed to attempt to read the file (
CreateFilewill fail if you cannot) and beg forgiveness (handle the error) afterwards.