feat: Extension methods for determining if a type represents an integer number, or if a type can represent a null value

ICD.Common.Utils.Tests/Extensions/TypeExtensionsTest.cs

@@ -10,6 +10,14 @@ namespace ICD.Common.Utils.Tests.Extensions
 	[TestFixture]
 	public sealed class TypeExtensionsTest
 	{
+		[TestCase(typeof(byte), false)]
+		[TestCase(typeof(byte?), true)]
+		[TestCase(typeof(string), true)]
+		public void CanBeNullTest(Type value, bool expected)
+		{
+			Assert.AreEqual(expected, value.CanBeNull());
+		}
+
 		[TestCase(typeof(byte), true)]
 		[TestCase(typeof(decimal), true)]
 		[TestCase(typeof(double), true)]
@@ -61,6 +69,23 @@ namespace ICD.Common.Utils.Tests.Extensions
 			Assert.AreEqual(expected, value.IsDecimalNumeric());
 		}
 
+		[TestCase(typeof(byte), true)]
+		[TestCase(typeof(decimal), false)]
+		[TestCase(typeof(double), false)]
+		[TestCase(typeof(float), false)]
+		[TestCase(typeof(int), true)]
+		[TestCase(typeof(long), true)]
+		[TestCase(typeof(sbyte), true)]
+		[TestCase(typeof(short), true)]
+		[TestCase(typeof(uint), true)]
+		[TestCase(typeof(ulong), true)]
+		[TestCase(typeof(ushort), true)]
+		[TestCase(typeof(string), false)]
+		public void IsIntegerNumericTest(Type value, bool expected)
+		{
+			Assert.AreEqual(expected, value.IsIntegerNumeric());
+		}
+
 		[TestCase(typeof(string), typeof(object), true)]
 		[TestCase(typeof(object), typeof(string), false)]
 		public void IsAssignableToTest(Type a, Type b, bool expected)

ICD.Common.Utils/Extensions/TypeExtensions.cs

@@ -45,6 +45,18 @@ namespace ICD.Common.Utils.Extensions
 			typeof(float),
 		};
 
+		private static readonly IcdHashSet<Type> s_IntegerNumericTypes = new IcdHashSet<Type>
+		{
+			typeof(byte),
+			typeof(int),
+			typeof(long),
+			typeof(sbyte),
+			typeof(short),
+			typeof(uint),
+			typeof(ulong),
+			typeof(ushort)
+		};
+
 		private static readonly Dictionary<Type, Type[]> s_TypeAllTypes;
 		private static readonly Dictionary<Type, Type[]> s_TypeBaseTypes;
 		private static readonly Dictionary<Type, Type[]> s_TypeImmediateInterfaces;
@@ -61,6 +73,19 @@ namespace ICD.Common.Utils.Extensions
 			s_TypeMinimalInterfaces = new Dictionary<Type, Type[]>();
 		}
 
+		/// <summary>
+		/// Returns true if the given type can represent a null value.
+		/// </summary>
+		/// <param name="extends"></param>
+		/// <returns></returns>
+		public static bool CanBeNull(this Type extends)
+		{
+			if (extends == null)
+				throw new ArgumentException("extends");
+
+			return !extends.IsValueType || Nullable.GetUnderlyingType(extends) != null;
+		}
+
 		/// <summary>
 		/// Returns true if the given type is a numeric type.
 		/// </summary>
@@ -100,6 +125,19 @@ namespace ICD.Common.Utils.Extensions
 			return s_DecimalNumericTypes.Contains(extends);
 		}
 
+		/// <summary>
+		/// Returns true if the given type is an integer numeric type.
+		/// </summary>
+		/// <param name="extends"></param>
+		/// <returns></returns>
+		public static bool IsIntegerNumeric(this Type extends)
+		{
+			if (extends == null)
+				throw new ArgumentException("extends");
+
+			return s_IntegerNumericTypes.Contains(extends);
+		}
+
 		/// <summary>
 		/// Gets the Assembly containing the type.
 		/// </summary>