Optimized ToList and ToArray extension methods

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

@@ -288,6 +288,24 @@ namespace ICD.Common.Utils.Tests.Extensions
 			Assert.AreEqual(3, values[1]);
 		}
 
+		[Test]
+		public void ToArrayCountTest()
+		{
+			int[] array = Enumerable.Range(0, 100).ToArray();
+			int[] copy = array.ToArray(array.Length);
+
+			Assert.IsTrue(copy.SequenceEqual(array));
+		}
+
+		[Test]
+		public void ToListCountTest()
+		{
+			List<int> array = Enumerable.Range(0, 100).ToList();
+			List<int> copy = array.ToList(array.Count);
+
+			Assert.IsTrue(copy.SequenceEqual(array));
+		}
+
 		[Test]
 		public void ToHashSetTest()
 		{

ICD.Common.Utils/Extensions/EnumerableExtensions.cs

@@ -504,6 +504,49 @@ namespace ICD.Common.Utils.Extensions
 			return new IcdHashSet<T>(extends);
 		}
 
+		/// <summary>
+		/// Optimized ToArray implementation with fewer allocations.
+		/// </summary>
+		/// <typeparam name="T"></typeparam>
+		/// <param name="extends"></param>
+		/// <param name="count"></param>
+		/// <returns></returns>
+		public static T[] ToArray<T>(this IEnumerable<T> extends, int count)
+		{
+			if (extends == null)
+				throw new ArgumentNullException("extends");
+
+			if (count < 0)
+				throw new ArgumentOutOfRangeException("count");
+
+			T[] array = new T[count];
+			int i = 0;
+
+			foreach (T item in extends)
+				array[i++] = item;
+			return array;
+		}
+
+		/// <summary>
+		/// Optimized ToList implementation with fewer allocations.
+		/// </summary>
+		/// <typeparam name="T"></typeparam>
+		/// <param name="extends"></param>
+		/// <param name="count"></param>
+		/// <returns></returns>
+		public static List<T> ToList<T>(this IEnumerable<T> extends, int count)
+		{
+			if (extends == null)
+				throw new ArgumentNullException("extends");
+
+			if (count < 0)
+				throw new ArgumentOutOfRangeException("count");
+
+			List<T> list = new List<T>(count);
+			list.AddRange(extends);
+			return list;
+		}
+
 		/// <summary>
 		/// Returns the sequence as an index:value dictionary.
 		/// </summary>