/// <summary>
/// Move <paramref name="sourcePath"/> to <paramref name="destinationPath"/>. If src
/// and dest are on different partitions (e.g., temp and documents are on different
/// drives) then this method will do a copy followed by a delete. This is in contrast
/// to Directory.Move which fails if src and dest are on different partitions.
/// </summary>
/// <param name="sourcePath">The source directory or file, similar to Directory.Move</param>
/// <param name="destinationPath">The destination directory or file. If <paramref name="sourcePath"/>
/// is a file then <paramref name="destinationPath"/> also needs to be a file.</param>
public static void Move(string sourcePath, string destinationPath)
{
if (PathHelper.AreOnSameVolume(destinationPath, sourcePath))
{
Directory.Move(sourcePath, destinationPath);
return;
}
if (Directory.Exists(sourcePath))
{
Copy(sourcePath, destinationPath);
Directory.Delete(sourcePath, true);
}
else if (File.Exists(sourcePath))
{
if (File.Exists(destinationPath) || Directory.Exists(destinationPath))
{
throw new IOException("Cannot create a file when that file already exists.");
}
File.Copy(sourcePath, destinationPath);
File.Delete(sourcePath);
}
else
{
throw new DirectoryNotFoundException(
string.Format("Could not find a part of the path '{0}'", sourcePath));
}
}
public static bool PathsAreOnSameVolume(string firstPath, string secondPath)
{
return(PathHelper.AreOnSameVolume(firstPath, secondPath));
}
/// <summary>
/// If there is a problem doing the replace, a dialog is shown which tells the user
/// what happened, and lets them try to fix it. It also lets them "Give up", in
/// which case this returns False.
///
/// To help with situations where something may temporarily be holding on to the file,
/// this will retry for up to 5 seconds.
/// </summary>
/// <param name="sourcePath"></param>
/// <param name="destinationPath"></param>
/// <param name="backupPath">can be null if you don't want a replacement</param>
/// <returns>if the user gives up, throws whatever exception the file system gave</returns>
public static void ReplaceFileWithUserInteractionIfNeeded(string sourcePath,
string destinationPath,
string backupPath)
{
bool succeeded = false;
do
{
try
{
if (UnsafeForFileReplaceMethod(sourcePath) || UnsafeForFileReplaceMethod(destinationPath)
||
(!string.IsNullOrEmpty(backupPath) && !PathHelper.AreOnSameVolume(sourcePath, backupPath))
||
!PathHelper.AreOnSameVolume(sourcePath, destinationPath)
||
!File.Exists(destinationPath)
)
{
//can't use File.Replace or File.Move across volumes (sigh)
RobustFile.ReplaceByCopyDelete(sourcePath, destinationPath, backupPath);
}
else
{
var giveUpTime = DateTime.Now.AddSeconds(5);
Exception theProblem;
do
{
theProblem = null;
try
{
File.Replace(sourcePath, destinationPath, backupPath);
}
catch (UnauthorizedAccessException uae)
{
// We were getting this while trying to Replace on a JAARS network drive.
// The network drive is U:\ which maps to \\waxhaw\users\{username},
// so it doesn't get caught by the checks above.
// Both files were in the same directory and there were no permissions issues,
// but the Replace command was failing with "Access to the path is denied." anyway.
// I never could figure out why. See http://issues.bloomlibrary.org/youtrack/issue/BL-4179
try
{
RobustFile.ReplaceByCopyDelete(sourcePath, destinationPath, backupPath);
}
catch
{
// Though it probably doesn't matter, report the original exception since we prefer Replace to CopyDelete.
theProblem = uae;
Thread.Sleep(100);
}
}
catch (Exception e)
{
theProblem = e;
Thread.Sleep(100);
}
} while (theProblem != null && DateTime.Now < giveUpTime);
if (theProblem != null)
{
throw theProblem;
}
}
succeeded = true;
}
catch (UnauthorizedAccessException error)
{
ReportFailedReplacement(destinationPath, error);
}
catch (IOException error)
{
ReportFailedReplacement(destinationPath, error);
}
}while (!succeeded);
}
