Initial version.

TINKLib/Model/Bikes/BikeCollection.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using System.Linq;
+
+using BikeInfo = TINK.Model.Bike.BC.BikeInfo;
+
+namespace TINK.Model.Bike
+{
+    public class BikeCollection : IBikeDictionary<BikeInfo> 
+    {
+        /// <summary> Holds the bike dictionary object.</summary>
+        private  Dictionary<int, BikeInfo> BikeDictionary { get; }
+
+        /// <summary>Constructs an empty bike info dictionary object.</summary>
+        public BikeCollection()
+        {
+            BikeDictionary = new Dictionary<int, BikeInfo>();
+        }
+
+        /// <summary> Constructs a bike collection object.</summary>
+        /// <param name="bikeDictionary"></param>
+        public BikeCollection(Dictionary<int, BikeInfo> bikeDictionary)
+        {
+            BikeDictionary = bikeDictionary ??
+                throw new ArgumentNullException(nameof(bikeDictionary), "Can not construct BikeCollection object.");
+        }
+
+        /// <summary> Gets a bike by its id.</summary>
+        /// <param name="p_iId">Id of the bike to get.</param>
+        /// <returns></returns>
+        public BikeInfo GetById(int p_iId)
+        {
+            return BikeDictionary.FirstOrDefault(x => x.Key == p_iId).Value;
+        }
+
+        /// <summary> Gets the count of bikes. </summary>
+        public int Count => BikeDictionary.Count;
+
+        /// <summary> Gets if a bike with given id exists.</summary>
+        /// <param name="p_iId">Id of bike.</param>
+        /// <returns>True if bike is contained, false otherwise.</returns>
+        public bool ContainsKey(int p_iId) => BikeDictionary.Keys.Contains(p_iId);
+
+        /// <summary> Gets the enumerator. </summary>
+        /// <returns>Enumerator object.</returns>
+        public IEnumerator<BikeInfo> GetEnumerator() => BikeDictionary.Values.GetEnumerator();
+
+        /// <summary> Gets the enumerator. </summary>
+        /// <returns>Enumerator object.</returns>
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+    }
+}