>>>Is it possible that such a command does not lock the file?
>>>
>>>
>>>File.Copy(cSource, cDestination, lOverwrite)
>>>
>>>
>>>I am copying a file into a directory and in the middle of the copy, I have an access is denied. We believe this is because someone else took over the file. But, I assumed File.Copy would have locked the file during the process of the copy.
>>
>>Not sure what you mean by 'in the *middle* of the copy' ?
>>
>>If you are getting the UnauthorizedAccessException then, as Gregory suggests, I'd take it at face value and look at the permissions.
>
>Viv,
>
>I've had a look at the source. It doesn't open anything. Just calls a method, calling a method, finally calling CopyFile api
>Certainly CopyFile will open the source and the destination
>
>Maybe you can spot something different ? Maybe FileSecurityState/FileIOPermission - but I do not think so
Only have time for a quick look. Don't know which block is being used ( FEATURE_CORECLR && !FEATURE_LEGACYNETCFIOSECURITY) but FileIOPermission.Demand() can throw an exception and presumably FileSecurityState.EnsureState() could do the same - don't see any docs. for the latter class ?
>from File.cs (excerpts)
>
> public static void Copy(String sourceFileName, String destFileName, bool overwrite) {
> if (sourceFileName == null)
> throw new ArgumentNullException("sourceFileName", Environment.GetResourceString("ArgumentNull_FileName"));
> if (destFileName == null)
> throw new ArgumentNullException("destFileName", Environment.GetResourceString("ArgumentNull_FileName"));
> if (sourceFileName.Length == 0)
> throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), "sourceFileName");
> if (destFileName.Length == 0)
> throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), "destFileName");
> Contract.EndContractBlock();
>
> InternalCopy(sourceFileName, destFileName, overwrite, true);
> }
>>
>
> [ResourceExposure(ResourceScope.Machine)]
> [ResourceConsumption(ResourceScope.Machine)]
> internal static String InternalCopy(String sourceFileName, String destFileName, bool overwrite, bool checkHost) {
> Contract.Requires(sourceFileName != null);
> Contract.Requires(destFileName != null);
> Contract.Requires(sourceFileName.Length > 0);
> Contract.Requires(destFileName.Length > 0);
>
> String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
> String fullDestFileName = Path.GetFullPathInternal(destFileName);
>
>#if FEATURE_CORECLR && !FEATURE_LEGACYNETCFIOSECURITY
> if (checkHost) {
> FileSecurityState sourceState = new FileSecurityState(FileSecurityStateAccess.Read, sourceFileName, fullSourceFileName);
> FileSecurityState destState = new FileSecurityState(FileSecurityStateAccess.Write, destFileName, fullDestFileName);
> sourceState.EnsureState();
> destState.EnsureState();
> }
> else {
>#endif
> new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullSourceFileName }, false, false ).Demand();
> new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false ).Demand();
>#if FEATURE_CORECLR && !FEATURE_LEGACYNETCFIOSECURITY
> }
>#endif
>
> bool r = Win32Native.CopyFile(fullSourceFileName, fullDestFileName, !overwrite);
> if (!r) {
> // Save Win32 error because subsequent checks will overwrite this HRESULT.
> int errorCode = Marshal.GetLastWin32Error();
> String fileName = destFileName;
>
> if (errorCode != Win32Native.ERROR_FILE_EXISTS) {
> // For a number of error codes (sharing violation, path
> // not found, etc) we don't know if the problem was with
> // the source or dest file. Try reading the source file.
> using(SafeFileHandle handle = Win32Native.UnsafeCreateFile(fullSourceFileName, FileStream.GENERIC_READ, FileShare.Read, null, FileMode.Open, 0, IntPtr.Zero)) {
> if (handle.IsInvalid)
> fileName = sourceFileName;
> }
>
> if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
> if (Directory.InternalExists(fullDestFileName))
> throw new IOException(Environment.GetResourceString("Arg_FileIsDirectory_Name", destFileName), Win32Native.ERROR_ACCESS_DENIED, fullDestFileName);
> }
> }
>
> __Error.WinIOError(errorCode, fileName);
> }
>
> return fullDestFileName;
> }
>>
>
>Win32Native.cs (excerpt)
>
> [DllImport(KERNEL32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)]
> [ResourceExposure(ResourceScope.Machine)]
> internal static extern bool CopyFile(
> String src, String dst, bool failIfExists);
>
