.net - Files: how to distinguish file lock and permission denied cases? -


how distinguish cases when file operation failed due file lock , lack of permissions?

as per answer here: is there way check if file in use?

const int error_sharing_violation = 32; const int error_lock_violation = 33;  private static bool isfilelocked(exception exception) {     int errorcode = marshal.gethrforexception(exception) & ((1 << 16) - 1);     return errorcode == error_sharing_violation || errorcode == error_lock_violation; }

...

filestream stream = null; try { stream = file.open(filepath, filemode.open, fileaccess.readwrite, fileshare.none); } catch (ioexception ex) {    if (isfilelocked(ex))    {     // know file locked    }  } catch (argumentnullexception ex) {     handleexception(ex); } catch (securityexception ex) {     handleexception(ex); } catch (argumentexception ex) {     handleexception(ex); } catch (objectdisposedexception ex) {     handleexception(ex); } catch (unauthorizedaccessexception ex) {     // know dont have permission file     handleexception(ex); } catch (exception ex)  { }

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