C:/Private/OSS/n2cms/github/n2cms/src/Framework/N2/Collections/DuplicateFilter.cs

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using System;
using System.Collections.Generic;

namespace N2.Collections
{
        public class DuplicateFilter : ItemFilter
        {
                #region Private Fields
                private Dictionary<int, bool> existing = new Dictionary<int, bool>();   
                #endregion

                #region Public Methods
                public override bool Match(N2.ContentItem item)
                {
                        if (existing.ContainsKey(item.ID))
                                return false;

                        existing.Add(item.ID, true);
                        return true;
                }

                public void Clear()
                {
                        existing.Clear();
                } 
                #endregion

                public static void FilterDuplicates(IList<ContentItem> items)
                {
                        ItemFilter.Filter(items, new DuplicateFilter());
                }

                #region IDisposable Members

                public override void Dispose()
                {
                        Clear();
                }

                #endregion
        }
}