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Common/DTS.Common/Classes/BulkObservableCollection.cs

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+using DTS.Common.Utilities.Logging;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+
+namespace DTS.Common.Classes
+{
+    /// <summary>
+    /// this is a helper class to avoid performance issues
+    /// adding or removing a bulk sequence of items from the collection
+    /// by firing just one notification rather than n
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
+    public class BulkObservableCollection<T> : ObservableCollection<T>
+    {
+        public void AddRange(IEnumerable<T> items)
+        {
+            try
+            {
+                // Turn off notifications (check if anyone is listening first)
+                CheckReentrancy();
+                foreach (var item in items) { Items.Add(item); }
+                // Fire a single notification that the entire "Reset" happened
+                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+                OnPropertyChanged(new PropertyChangedEventArgs(nameof(Count)));
+            }
+            catch( Exception ex)
+            {
+                APILogger.Log(ex);
+            }
+        }
+        public void RemoveRange(IEnumerable<T> itemsToRemove)
+        {
+            try
+            {
+                CheckReentrancy();
+
+                foreach (var item in itemsToRemove)
+                {
+                    Items.Remove(item);
+                }
+
+                // Fire one single notification for the entire operation
+                OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+                OnPropertyChanged(new PropertyChangedEventArgs(nameof(Count)));
+            }
+            catch( Exception ex)
+            {
+                APILogger.Log(ex);
+            }
+        }
+    }
+}