Just everything is better

TestVideo/EnumExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TestVideo
+{
+    public static class EnumExtensions
+    {
+        /// <summary>
+        /// Gets all items for an enum value.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="value">The value.</param>
+        /// <returns></returns>
+        public static IEnumerable<T> GetAllItems<T>(this Enum value)
+        {
+            foreach (object item in Enum.GetValues(typeof(T)))
+            {
+                yield return (T)item;
+            }
+        }
+
+        /// <summary>
+        /// Gets all items for an enum type.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="value">The value.</param>
+        /// <returns></returns>
+        public static IEnumerable<T> GetAllItems<T>() where T : struct
+        {
+            foreach (object item in Enum.GetValues(typeof(T)))
+            {
+                yield return (T)item;
+            }
+        }
+
+        /// <summary>
+        /// Gets all combined items from an enum value.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="value">The value.</param>
+        /// <returns></returns>
+        /// <example>
+        /// Displays ValueA and ValueB.
+        /// <code>
+        /// EnumExample dummy = EnumExample.Combi;
+        /// foreach (var item in dummy.GetAllSelectedItems<EnumExample>())
+        /// {
+        ///    Console.WriteLine(item);
+        /// }
+        /// </code>
+        /// </example>
+        public static IEnumerable<T> GetAllSelectedItems<T>(this Enum value)
+        {
+            int valueAsInt = Convert.ToInt32(value, CultureInfo.InvariantCulture);
+
+            foreach (object item in Enum.GetValues(typeof(T)))
+            {
+                int itemAsInt = Convert.ToInt32(item, CultureInfo.InvariantCulture);
+
+                if (itemAsInt == (valueAsInt & itemAsInt))
+                {
+                    yield return (T)item;
+                }
+            }
+        }
+
+        /// <summary>
+        /// Determines whether the enum value contains a specific value.
+        /// </summary>
+        /// <param name="value">The value.</param>
+        /// <param name="request">The request.</param>
+        /// <returns>
+        ///     <c>true</c> if value contains the specified value; otherwise, <c>false</c>.
+        /// </returns>
+        /// <example>
+        /// <code>
+        /// EnumExample dummy = EnumExample.Combi;
+        /// if (dummy.Contains<EnumExample>(EnumExample.ValueA))
+        /// {
+        ///     Console.WriteLine("dummy contains EnumExample.ValueA");
+        /// }
+        /// </code>
+        /// </example>
+        public static bool Contains<T>(this Enum value, T request)
+        {
+            int valueAsInt = Convert.ToInt32(value, CultureInfo.InvariantCulture);
+            int requestAsInt = Convert.ToInt32(request, CultureInfo.InvariantCulture);
+
+            if (requestAsInt == (valueAsInt & requestAsInt))
+            {
+                return true;
+            }
+
+            return false;
+        }
+    }
+}