public static void Move(this DirectoryInfo srcDir, string destPath,
NameCollisionOption nameCollisionOption)
{
if (string.IsNullOrWhiteSpace(destPath))
{
throw new ArgumentNullException(nameof(destPath));
}
if (!srcDir.Exists)
{
throw new DirectoryNotFoundException("Source folder is not exist");
}
var item = FileSystemInfoEx.GetFileSystemInfo(destPath);
if (item.Exists)
{
if (!string.Equals(srcDir.FullName, item.FullName, StringComparison.OrdinalIgnoreCase))
{
switch (nameCollisionOption)
{
case NameCollisionOption.GenerateUniqueName:
srcDir.Move(item.GetParent().FullName,
ProductNextName(item.Name), nameCollisionOption);
return;
case NameCollisionOption.ReplaceExisting:
item.Delete();
break;
case NameCollisionOption.FailIfExists:
var type = item is DirectoryInfo ? "srcDir" : "file";
throw new IOException($"A {type} exists in {destPath}");
default:
throw new ArgumentException("invalid option", nameof(nameCollisionOption));
}
}
else
{
if (string.Equals(srcDir.FullName, item.FullName, StringComparison.Ordinal))
{
throw new IOException("Source and destination folders are same");
}
else
{
srcDir.Move(item.GetParent(), ProductNextName(srcDir.Name),
NameCollisionOption.GenerateUniqueName);
srcDir.Move(destPath, nameCollisionOption);
return;
}
}
}
try
{
srcDir.MoveTo(destPath);
}
catch (IOException)
{
srcDir.CopyTo(destPath, nameCollisionOption);
srcDir.Delete();
}
}
