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DataDisplay/DataSource/EnumerableDataSourceBase.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Diagnostics;
+using System.Windows;
+using Xamarin.Forms;
+
+namespace DataDisplay.DataSource
+{
+    /// <summary>Base class for all sources who receive data for charting 
+    /// from any IEnumerable of T</summary>
+    /// <typeparam name="T">Type of items in IEnumerable</typeparam>
+	public abstract class EnumerableDataSourceBase<T> : IPointDataSource {
+        private IEnumerable data;
+
+		/// <summary>
+		/// Gets or sets the data.
+		/// </summary>
+		/// <value>The data.</value>
+        public IEnumerable Data {
+			get { return data; }
+			set {
+				if (value == null)
+					throw new ArgumentNullException("value");
+
+				data = value;
+
+				var observableCollection = data as INotifyCollectionChanged;
+				if (observableCollection != null) {
+					observableCollection.CollectionChanged += observableCollection_CollectionChanged;
+				}
+			}
+		}
+
+		protected EnumerableDataSourceBase(IEnumerable<T> data) : this((IEnumerable)data) { }
+
+		protected EnumerableDataSourceBase(IEnumerable data) {
+			if (data == null)
+				throw new ArgumentNullException("data");
+			Data = data;
+		}
+
+		private void observableCollection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e) {
+			RaiseDataChanged();
+		}
+
+		public event EventHandler DataChanged;
+		public void RaiseDataChanged() {
+			if (DataChanged != null) {
+				DataChanged(this, EventArgs.Empty);
+			}
+		}
+
+		public abstract IPointEnumerator GetEnumerator(BindableObject context);
+	}
+}