Add FindPathMapByDestinationPath to local helper.

Author: BlaiseD

src/AutoMapper.Extensions.ExpressionMapping/TypeMapHelper.cs

@@ -39,6 +39,9 @@ public static string GetDestinationName(this IMemberMap memberMap)
             throw new ArgumentException(nameof(memberMap));
         }
 
+        public static PathMap FindPathMapByDestinationFullPath(this TypeMap typeMap, string destinationFullPath) =>
+            typeMap.PathMaps.SingleOrDefault(item => string.Join(".", item.MemberPath.Members.Select(m => m.Name)) == destinationFullPath);
+
         private static Exception PropertyConfigurationException(TypeMap typeMap, params string[] unmappedPropertyNames)
             => new AutoMapperConfigurationException(new[] { new AutoMapperConfigurationException.TypeMapConfigErrors(typeMap, unmappedPropertyNames, true) });
 

src/AutoMapper.Extensions.ExpressionMapping/XpressionMapperVisitor.cs

@@ -679,7 +679,7 @@ TypeMap GetTypeMap() => BothTypesAreAnonymous()
 
             var typeMap = GetTypeMap();
 
-            PathMap pathMap = typeMap.FindPathMapByDestinationPath(destinationFullPath: sourceFullName);
+            PathMap pathMap = typeMap.FindPathMapByDestinationFullPath(destinationFullPath: sourceFullName);
             if (pathMap != null)
             {
                 propertyMapInfoList.Add(new PropertyMapInfo(pathMap.CustomMapExpression, new List<MemberInfo>()));