init

Common/DTS.Common.Utilities/.svn/pristine/d5/d5ea7d53e6adbecc2d9299e7fe2ad999442a2929.svn-base

@@ -0,0 +1,50 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Reflection;
+
+namespace DTS.Common.Utilities
+{
+    public class PropertyComparer<T> : IComparer<T>
+    {
+        private readonly IComparer _comparer;
+        private PropertyDescriptor _propertyDescriptor;
+        private int _reverse;
+
+        public PropertyComparer(PropertyDescriptor property, ListSortDirection direction)
+        {
+            _propertyDescriptor = property;
+            var comparerForPropertyType = typeof(Comparer<>).MakeGenericType(property.PropertyType);
+            _comparer =
+                (IComparer)
+                comparerForPropertyType.InvokeMember("Default",
+                    BindingFlags.Static | BindingFlags.GetProperty | BindingFlags.Public, null, null, null);
+            SetListSortDirection(direction);
+        }
+
+        #region IComparer<T> Members
+
+        public int Compare(T x, T y)
+        {
+            return _reverse * _comparer.Compare(_propertyDescriptor.GetValue(x), _propertyDescriptor.GetValue(y));
+        }
+
+        #endregion
+
+        private void SetPropertyDescriptor(PropertyDescriptor descriptor)
+        {
+            _propertyDescriptor = descriptor;
+        }
+
+        private void SetListSortDirection(ListSortDirection direction)
+        {
+            _reverse = direction == ListSortDirection.Ascending ? 1 : -1;
+        }
+
+        public void SetPropertyAndDirection(PropertyDescriptor descriptor, ListSortDirection direction)
+        {
+            SetPropertyDescriptor(descriptor);
+            SetListSortDirection(direction);
+        }
+    }
+}