Utilities for Exchange Webservice

EwsExtensions.cs

static class EwsExtensions
{
	public static string GetFullPath(this Folder folder, string separator = "/")
	{
		var folderPathProperty = new ExtendedPropertyDefinition(26293, MapiPropertyType.String);
		var folderPathPropertySet = new PropertySet(BasePropertySet.FirstClassProperties) { folderPathProperty };
		var folderWithFullnameProperty = Folder.Bind(folder.Service, folder.Id, folderPathPropertySet);
		
		object pathObj = null;
		if (!folderWithFullnameProperty.TryGetProperty(folderPathProperty, out pathObj))
		{
			return folder.DisplayName;
		}
		
		var path = (string)pathObj;
		return path.Replace("\uFFFE", separator);
	}
	
	public static IEnumerable<TItem> ViewToEnumerable<TItem, TView>(Func<int, TView> createView, Func<TView, Tuple<Collection<TItem>, int?, int>> getViewResults,
		int viewSize = 1000, IProgress<Tuple<int,int>> progress = null)
		where TView : PagedView
	{
		var view = createView(viewSize);
		Tuple<Collection<TItem>, int?, int> results;
		int received = 0;
		do
		{
			results = getViewResults(view);
			received += results.Item1.Count;
			if (progress != null)
			{
				progress.Report(Tuple.Create(received, results.Item3));
			}
			
			foreach(var item in results.Item1)
			{
				yield return item;
			}
			
			if (results.Item2 != null)
			{
				view.Offset = results.Item2.Value;
			}
		} while(results.Item2.HasValue && results.Item2 > 0);
	}
	
	public static IEnumerable<Folder> FindFolders(this Folder parent, IProgress<Tuple<int,int>> progress = null)
	{
		return ViewToEnumerable(
			pageSize => new FolderView(pageSize),
			view =>
			{
				var result = parent.FindFolders(view);
				return Tuple.Create(result.Folders, result.NextPageOffset, result.TotalCount);
			}, progress: progress);
	}
	
	public static IEnumerable<Folder> GetAllSubFoldersAndSelf(this Folder parent)
	{
		var queue = new Queue<Folder>();
		queue.Enqueue(parent);
		while(queue.Count > 0)
		{
			var item = queue.Dequeue();
			yield return item;
			foreach(var child in item.FindFolders())
			{
				queue.Enqueue(child);
			}
		}
	}
	
	public static Folder GetSubFolder(this Folder parent, string displayName)
	{
		return parent.FindFolders().First(f => f.DisplayName == displayName);
	}

	public static IEnumerable<Item> FindItems(this Folder folder, SearchFilter filter, IProgress<Tuple<int,int>> progress = null)
	{
		return ViewToEnumerable(
			pageSize => new ItemView(pageSize),
			view =>
			{
				var result = folder.Service.FindItems(folder.Id, filter, view);
				return Tuple.Create(result.Items, result.NextPageOffset, result.TotalCount);
			}, progress: progress);
	}
}