Add new filter fuatures

Filtration.Common/Extensions/EnumerationExtension.cs

@@ -0,0 +1,65 @@
+using System;
+using System.ComponentModel;
+using System.Linq;
+using System.Windows.Markup;
+
+namespace Filtration.Common.Extensions
+{
+    public class EnumerationExtension : MarkupExtension
+    {
+        private Type _enumType;
+
+
+        public EnumerationExtension(Type enumType)
+        {
+            if (enumType == null) throw new ArgumentNullException(nameof(enumType));
+
+            EnumType = enumType;
+        }
+
+        public Type EnumType
+        {
+            get
+            {
+                return _enumType;
+            }
+            private set
+            {
+                if (_enumType == value) return;
+
+                var enumType = Nullable.GetUnderlyingType(value) ?? value;
+
+                if (enumType.IsEnum == false) throw new ArgumentException("Type must be an Enum.");
+
+                _enumType = value;
+            }
+        }
+
+        public override object ProvideValue(IServiceProvider serviceProvider)
+        {
+            var enumValues = Enum.GetValues(EnumType);
+
+            return (from object enumValue in enumValues
+                    select new EnumerationMember { Value = enumValue, Description = GetDescription(enumValue) }).ToArray
+                ();
+        }
+
+        private string GetDescription(object enumValue)
+        {
+            var descriptionAttribute =
+                EnumType.GetField(enumValue.ToString())
+                    .GetCustomAttributes(typeof(DescriptionAttribute), false)
+                    .FirstOrDefault() as DescriptionAttribute;
+
+
+            return descriptionAttribute != null ? descriptionAttribute.Description : enumValue.ToString();
+        }
+
+        public class EnumerationMember
+        {
+            public string Description { get; set; }
+
+            public object Value { get; set; }
+        }
+    }
+}