support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Data/FrugalMap.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections;
+
+namespace HandyControl.Data
+{
+    internal enum FrugalMapStoreState
+    {
+        Success,
+        ThreeObjectMap,
+        SixObjectMap,
+        Array,
+        SortedArray,
+        Hashtable
+    }
+
+    internal delegate void FrugalMapIterationCallback(ArrayList list, int key, object value);
+
+    abstract class FrugalMapBase
+    {
+        public abstract FrugalMapStoreState InsertEntry(int key, Object value);
+
+        public abstract void RemoveEntry(int key);
+
+        /// <summary>
+        /// Looks for an entry that contains the given key, null is returned if the
+        /// key is not found.
+        /// </summary>
+        public abstract Object Search(int key);
+
+
+        /// <summary>
+        /// A routine used by enumerators that need a sorted map
+        /// </summary>
+        public abstract void Sort();
+
+        /// <summary>
+        /// A routine used by enumerators to iterate through the map
+        /// </summary>
+        public abstract void GetKeyValuePair(int index, out int key, out Object value);
+
+        /// <summary>
+        /// A routine used to iterate through all the entries in the map
+        /// </summary>
+        public abstract void Iterate(ArrayList list, FrugalMapIterationCallback callback);
+
+        /// <summary>
+        /// Promotes the key/value pairs in the current collection to the next larger
+        /// and more complex storage model.
+        /// </summary>
+        public abstract void Promote(FrugalMapBase newMap);
+
+        /// <summary>
+        /// Size of this data store
+        /// </summary>
+        public abstract int Count
+        {
+            get;
+        }
+
+        protected const int INVALIDKEY = 0x7FFFFFFF;
+
+        internal struct Entry
+        {
+            public int Key;
+            public object Value;
+        }
+    }
+}