added marr.datamapper source code for easy debugging.

Marr.Data/EntityMerger.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Linq.Expressions;
+
+namespace Marr.Data
+{
+    /// <summary>
+    /// This utility class allows you to join two existing entity collections.
+    /// </summary>
+    public class EntityMerger
+    {
+        /// <summary>
+        /// Joines to existing entity collections.
+        /// </summary>
+        /// <typeparam name="TParent">The parent entity type.</typeparam>
+        /// <typeparam name="TChild">The child entity type.</typeparam>
+        /// <param name="parentList">The parent entities.</param>
+        /// <param name="childList">The child entities</param>
+        /// <param name="relationship">A predicate that defines the relationship between the parent and child entities.  Returns true if they are related.</param>
+        /// <param name="mergeAction">An action that adds a related child to the parent.</param>
+        public static void Merge<TParent, TChild>(IEnumerable<TParent> parentList, IEnumerable<TChild> childList, Func<TParent, TChild, bool> relationship, Action<TParent, TChild> mergeAction)
+        {
+            foreach (TParent parent in parentList)
+            {
+                foreach (TChild child in childList)
+                {
+                    if (relationship(parent, child))
+                    {
+                        mergeAction(parent, child);
+                    }
+                }
+            }
+        }
+    }
+}