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Asked: 2026-05-10T17:11:43+00:00

This snippet works well if I try to write in a user directory but

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This snippet works well if I try to write in a user directory but as soon as I try to write in Program Files, it just executes silently and the file has not been copied (no exception). If I try to copy the file in C:\ or in C:\Windows I catch an UnauthorizedAccessException.

Do you know another way to get the permissions to write in that directory or to make it work another way?

Any help greatly appreciated! Thanks

using(FileStream fs=File.Open(source, FileMode.Open)){ }   try   {       FileIOPermission fp = new FileIOPermission(FileIOPermissionAccess.Write,                              AccessControlActions.Change, 'C:\\Program Files\\MyPath');       fp.Demand();  //<-- no exception but file is not copied     File.Copy('C:\\Users\\teebot\\Documents\\File.xml','C:\\Program Files\\MyPath\\File.xml',true);   }   catch(SecurityExceptions)   {       throw(s);   }  catch(UnauthorizedAccessException unauthroizedException) {     throw unauthroizedException; }
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1 Answer

  1. If you are running under Vista then the system just redirects writes to the program files folder, this is done so old program that keep their configuration in the program directory will continue to work when the user is not an Admin (or UAC is enabled).

    All you have to do is add a manifest to your program that specify the required access level, then the system assume your program is Vista-aware and turns off all those compatibility patches.

    You can see an example of a manifest file on my blog at:

    http://www.nbdtech.com/blog/archive/2008/06/16/The-Application-Manifest-Needed-for-XP-and-Vista-Style-File.aspx

    (the focus of the post is on getting the right version of the common controls, but the Vista security declarations are also there)

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