merge alarm handling from remote

1 files changed, 31 insertions, 0 deletions

diff --git a/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/NullSafeCollection.cs b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/NullSafeCollection.cs
new file mode 100644
index 000000000..8a37c54ae
--- /dev/null
+++ b/Software/Visual_Studio/Scripting/Tango.Scripting.Editors/Utils/NullSafeCollection.cs
@@ -0,0 +1,31 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.ObjectModel;
+
+namespace Tango.Scripting.Editors.Utils
+{
+	/// <summary>
+	/// A collection that cannot contain null values.
+	/// </summary>
+	[Serializable]
+	public class NullSafeCollection<T> : Collection<T> where T : class
+	{
+		/// <inheritdoc/>
+		protected override void InsertItem(int index, T item)
+		{
+			if (item == null)
+				throw new ArgumentNullException("item");
+			base.InsertItem(index, item);
+		}
+		
+		/// <inheritdoc/>
+		protected override void SetItem(int index, T item)
+		{
+			if (item == null)
+				throw new ArgumentNullException("item");
+			base.SetItem(index, item);
+		}
+	}
+}