private void SetPropertiesFromDialogResult(NativeFolderBrowserDialog dialog)
{
dialog.GetResults(out IShellItemArray resultsArray);
DirectoryNames.Clear();
resultsArray.GetCount(out uint count);
for (uint i = 0; i < count; i++)
{
resultsArray.GetItemAt(i, out IShellItem result);
HResult hr = result.GetDisplayName(NativeMethods.SIGDN.SIGDN_DESKTOPABSOLUTEPARSING, out IntPtr ppszName);
if (hr == HResult.Ok && ppszName != IntPtr.Zero)
{
DirectoryNames.Add(Marshal.PtrToStringAuto(ppszName));
}
Marshal.FreeCoTaskMem(ppszName);
}
if (DirectoryNames.Count > 0)
{
DirectoryName = DirectoryNames[0];
}
}
private void SetDialogProperties(NativeFolderBrowserDialog dialog)
{
var flags = NativeMethods.FOS.FOS_PICKFOLDERS |
NativeMethods.FOS.FOS_FORCEFILESYSTEM |
NativeMethods.FOS.FOS_PATHMUSTEXIST |
NativeMethods.FOS.FOS_FILEMUSTEXIST |
NativeMethods.FOS.FOS_NOVALIDATE;
if (MultiSelect)
{
flags |= NativeMethods.FOS.FOS_ALLOWMULTISELECT;
}
dialog.SetOptions(flags);
if (!string.IsNullOrWhiteSpace(InitialDirectory))
{
if (!Directory.Exists(InitialDirectory))
{
try
{
// C:\Folder\File.exe becomes C:\Folder
InitialDirectory = Path.GetDirectoryName(InitialDirectory) ?? "";
if (!Directory.Exists(InitialDirectory))
{
return;
}
}
// Fix: we weren't checking for invalid path names
catch
{
return;
}
}
var guid = new Guid(Guids.IShellItem);
HResult result = NativeMethods.SHCreateItemFromParsingName(
InitialDirectory,
IntPtr.Zero,
ref guid,
out object item);
if (result != HResult.Ok)
{
throw Marshal.GetExceptionForHR((int)result) ?? new Exception("Argh!\r\n" + result);
}
dialog.SetFolder((IShellItem)item);
}
}
protected override bool RunDialog(IntPtr hwndOwner)
{
NativeFolderBrowserDialog?dialog = null;
try
{
dialog = new NativeFolderBrowserDialog();
SetDialogProperties(dialog);
HResult result = dialog.Show(hwndOwner);
if (result != HResult.Ok)
{
// ReSharper disable once ConvertIfStatementToReturnStatement
if (result == HResult.Canceled)
{
return(false);
}
else
{
// I think I want to just ignore exceptions and cancel if anything at all went wrong, but
// just in case I change my mind, here's the line to use:
// throw Marshal.GetExceptionForHR((int)result);
return(false);
}
}
SetPropertiesFromDialogResult(dialog);
return(true);
}
finally
{
if (dialog != null)
{
Marshal.FinalReleaseComObject(dialog);
}
}
}
