/// <summary>
/// Create a new instance of a <see cref="ShellFolder" /> derived class
/// that best matches the nature of the specified <see cref="ShellItem" />.
/// </summary>
/// <param name="shellItem"><see cref="ShellItem" />.</param>
/// <returns>Created a new instance of <see cref="ShellFolder" /> derived class.</returns>
private static ShellFolder CreateFolder(ShellItem shellItem)
{
Contract.Requires(shellItem != null);
var shellLibrary = ShellLibraryFactory.FromShellItem(shellItem, true);
if (SameItemType(shellItem.GetItemType(), ShellLibraryFactory.FileExtension) && (shellLibrary != null))
{
// Library
return(shellLibrary);
}
else if (SameItemType(shellItem, ShellSearchConnector.FileExtension))
{
// Search connector
return(new ShellSearchConnector(shellItem));
}
else if (SameItemType(shellItem, ShellSavedSearchCollection.FileExtension))
{
// Saved search collection
return(new ShellSavedSearchCollection(shellItem));
}
else
{
var knownFolderNative = GetKnownFolderNative(shellItem);
if (knownFolderNative != null)
{
// Known folder
return(new ShellKnownFolder(shellItem, knownFolderNative));
}
}
// Folder
return(new ShellFolder(shellItem));
}
/// <summary>
/// Determines wheter specified <see cref="ShellItem" /> item type and extension string have same item type.
/// </summary>
/// <param name="shellItem"><see cref="ShellItem" />.</param>
/// <param name="extension">The extensionstring to compare, or <c>null</c>.</param>
/// <returns>
/// <c>true</c> if the item type of <see cref="ShellItem" /> is the same as the value of <paramref name="extension" />;
/// otherwise <c>false</c>.
/// </returns>
private static bool SameItemType(ShellItem shellItem, string extension)
{
Contract.Requires(shellItem != null);
return(SameItemType(shellItem.GetItemType(), extension));
}
