added marr.datamapper source code for easy debugging.

Marr.Data/QGen/SortColumn.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Linq.Expressions;
+using System.Reflection;
+
+namespace Marr.Data.QGen
+{
+    public class SortColumn<T>
+    {
+        public SortColumn(Expression<Func<T, object>> sortExpression, SortDirection direction)
+        {
+            MemberExpression me = GetMemberExpression(sortExpression.Body);
+            DeclaringType = me.Expression.Type;
+            PropertyName = me.Member.Name;
+            Direction = direction;
+        }
+
+        public SortColumn(Type declaringType, string propertyName, SortDirection direction)
+        {
+            DeclaringType = declaringType;
+            PropertyName = propertyName;
+            Direction = direction;
+        }
+
+        public SortDirection Direction { get; private set; }
+        public Type DeclaringType { get; private set; }
+        public string PropertyName { get; private set; }
+
+        private MemberExpression GetMemberExpression(Expression exp)
+        {
+            MemberExpression me = exp as MemberExpression;
+
+            if (me == null)
+            {
+                var ue = exp as UnaryExpression;
+                me = ue.Operand as MemberExpression;
+            }
+
+            return me;
+        }
+    }
+    
+    public enum SortDirection
+    {
+        Asc,
+        Desc
+    }
+}