From 7cf3d18127ab04ab5f46eb927bbfaca8c9697b70 Mon Sep 17 00:00:00 2001
From: Laura Gomez <laura.gomez@profound-tech.com>
Date: Mon, 28 Oct 2019 18:40:15 -0400
Subject: [PATCH] feat: Adding CompareTo method wich helped with validation
 cheking on DeploymentTool.

---
 CHANGELOG.md                   |  3 +++
 ICD.Common.Utils/NullObject.cs | 18 +++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84c54b3..c98ef1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [Unreleased]
 
+### Changed
+ - NullObject implements IComparable, fixes issues with null keys in ordered dictionaries
+
 ## [10.0.0] - 2019-10-07
 ### Added
  - IcdEnvironment.GetUtcTime() to get UTC representaiton of current time.
diff --git a/ICD.Common.Utils/NullObject.cs b/ICD.Common.Utils/NullObject.cs
index 3850f81..ea405c0 100644
--- a/ICD.Common.Utils/NullObject.cs
+++ b/ICD.Common.Utils/NullObject.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 
 namespace ICD.Common.Utils
 {
@@ -6,7 +7,7 @@ namespace ICD.Common.Utils
 	/// Convenience wrapper for supporting null keys in hash tables.
 	/// </summary>
 	/// <typeparam name="T"></typeparam>
-	public struct NullObject<T> : IEquatable<NullObject<T>>
+	public struct NullObject<T> : IEquatable<NullObject<T>>, IComparable<NullObject<T>>
 	{
 		#region Properties
 
@@ -101,5 +102,20 @@ namespace ICD.Common.Utils
 		}
 
 		#endregion
+
+		#region Comparable
+
+		public int CompareTo(NullObject<T> other)
+		{
+			if (IsNull && other.IsNull)
+				return 0;
+
+			if (IsNull)
+				return -1;
+
+			return Comparer<T>.Default.Compare(Item, other.Item);
+		}
+
+		#endregion
 	}
 }