Supporting AutoMapper v10. Fixing Issue#79 (Local variable in express…

…ion not mapped using MapExpression).

Directory.Build.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <Authors>Jimmy Bogard</Authors>
     <LangVersion>latest</LangVersion>
-    <VersionPrefix>3.1.2</VersionPrefix>
+    <VersionPrefix>4.0.0-preview01</VersionPrefix>
     <WarningsAsErrors>true</WarningsAsErrors>
     <NoWarn>$(NoWarn);1701;1702;1591</NoWarn>
   </PropertyGroup>

src/AutoMapper.Extensions.ExpressionMapping/AutoMapper.Extensions.ExpressionMapping.csproj

@@ -17,7 +17,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AutoMapper" Version="9.0.0" />
+    <PackageReference Include="AutoMapper" Version="[10.0.0,11.0.0)" />
   </ItemGroup>
 
 </Project>

src/AutoMapper.Extensions.ExpressionMapping/ExpressionMapper.cs

@@ -4,15 +4,16 @@
 using System.Linq.Expressions;
 using System.Reflection;
 using AutoMapper.Extensions.ExpressionMapping;
+using AutoMapper.Internal;
 using static System.Linq.Expressions.Expression;
 
 namespace AutoMapper.Mappers
 {
     public class ExpressionMapper : IObjectMapper
     {
-        private static TDestination Map<TSource, TDestination>(TSource expression, ResolutionContext context)
+        private static TDestination Map<TSource, TDestination>(TSource expression, ResolutionContext context, IConfigurationProvider configurationProvider)
             where TSource : LambdaExpression
-            where TDestination : LambdaExpression => context.Mapper.MapExpression<TDestination>(expression);
+            where TDestination : LambdaExpression => configurationProvider.CreateMapper().MapExpression<TDestination>(expression);
 
         private static readonly MethodInfo MapMethodInfo = typeof(ExpressionMapper).GetDeclaredMethod(nameof(Map));
 
@@ -25,7 +26,8 @@ public Expression MapExpression(IConfigurationProvider configurationProvider, Pr
             Call(null, 
                 MapMethodInfo.MakeGenericMethod(sourceExpression.Type, destExpression.Type), 
                 sourceExpression, 
-                contextExpression);
+                contextExpression,
+                Constant(configurationProvider));
 
         internal class MappingVisitor : ExpressionVisitor
         {

src/AutoMapper.Extensions.ExpressionMapping/Extensions/VisitorExtensions.cs

@@ -92,6 +92,9 @@ public static Expression ConvertTypeIfNecessary(this Expression expression, Type
             return expression;
         }
 
+        public static MemberExpression GetMemberExpression(this LambdaExpression expr)
+            => expr.Body.GetUnconvertedMemberExpression() as MemberExpression;
+
         /// <summary>
         /// Returns the ParameterExpression for the LINQ parameter.
         /// </summary>
@@ -140,10 +143,15 @@ public static ParameterExpression GetParameterExpression(this Expression express
         /// </summary>
         /// <param name="expression"></param>
         /// <returns></returns>
-        public static Expression GetBaseOfMemberExpression(this MemberExpression expression) 
-            => expression.Expression.NodeType == ExpressionType.MemberAccess
-                ? GetBaseOfMemberExpression((MemberExpression)expression.Expression)
-                : expression.Expression;
+        public static Expression GetBaseOfMemberExpression(this MemberExpression expression)
+        {
+            if (expression.Expression == null)
+                return null;
+
+            return expression.Expression.NodeType == ExpressionType.MemberAccess
+                           ? GetBaseOfMemberExpression((MemberExpression)expression.Expression)
+                           : expression.Expression;
+        }
 
         /// <summary>
         /// Adds member expressions to an existing expression.

src/AutoMapper.Extensions.ExpressionMapping/Impl/SourceInjectedQueryProvider.cs

@@ -1,19 +1,18 @@
+using AutoMapper.Internal;
+using AutoMapper.Mappers;
 using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Reflection;
 using System.Runtime.CompilerServices;
-using AutoMapper.Mappers;
-using AutoMapper.Mappers.Internal;
-using AutoMapper.QueryableExtensions;
 
 namespace AutoMapper.Extensions.ExpressionMapping.Impl
 {
+    using static Expression;
     using MemberPaths = IEnumerable<IEnumerable<MemberInfo>>;
     using ParameterBag = IDictionary<string, object>;
-    using static Expression;
 
     public class SourceInjectedQueryProvider<TSource, TDestination> : IQueryProvider
     {

src/AutoMapper.Extensions.ExpressionMapping/MapperExtensions.cs

@@ -1,11 +1,10 @@
-using System;
+using AutoMapper.Internal;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
-using static System.Linq.Expressions.Expression;
 using System.Reflection;
-using AutoMapper.Mappers.Internal;
-using AutoMapper.Internal;
+using static System.Linq.Expressions.Expression;
 
 namespace AutoMapper.Extensions.ExpressionMapping
 {
@@ -36,10 +35,22 @@ private static TDestDelegate _MapExpression<TSourceDelegate, TDestDelegate>(this
             where TDestDelegate : LambdaExpression
             => mapper.MapExpression<TSourceDelegate, TDestDelegate>(expression);
 
-
         private static MethodInfo GetMapExpressionMethod(this string methodName)
             => typeof(MapperExtensions).GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Static);
 
+        public static object MapObject(this IMapper mapper, object obj, Type sourceType, Type destType) 
+            => "_MapObject".GetMapObjectMethod().MakeGenericMethod
+            (
+                sourceType,
+                destType
+            ).Invoke(null, new object[] { mapper, obj });
+
+        private static TDest _MapObject<TSource, TDest>(IMapper mapper, TSource source) 
+            => mapper.Map<TSource, TDest>(source);
+
+        private static MethodInfo GetMapObjectMethod(this string methodName)
+           => typeof(MapperExtensions).GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Static);
+
         /// <summary>
         /// Maps an expression given a dictionary of types where the source type is the key and the destination type is the value.
         /// </summary>

src/AutoMapper.Extensions.ExpressionMapping/ReflectionExtensions.cs

@@ -17,12 +17,6 @@ public static object GetDefaultValue(this ParameterInfo parameter)
         public static object MapMember(this ResolutionContext context, MemberInfo member, object value, object destination = null)
             => ReflectionHelper.MapMember(context, member, value, destination);
 
-        public static bool IsDynamic(this object obj)
-            => ReflectionHelper.IsDynamic(obj);
-
-        public static bool IsDynamic(this Type type)
-            => ReflectionHelper.IsDynamic(type);
-
         public static void SetMemberValue(this MemberInfo propertyOrField, object target, object value)
             => ReflectionHelper.SetMemberValue(propertyOrField, target, value);
 
@@ -38,27 +32,12 @@ public static MemberPaths GetMemberPaths(Type type, string[] membersToExpand) =>
         public static MemberPaths GetMemberPaths<TResult>(Expression<Func<TResult, object>>[] membersToExpand) =>
             membersToExpand.Select(expr => MemberVisitor.GetMemberPath(expr));
 
-        public static MemberInfo GetFieldOrProperty(this LambdaExpression expression)
-            => ReflectionHelper.GetFieldOrProperty(expression);
-
         public static MemberInfo FindProperty(LambdaExpression lambdaExpression)
             => ReflectionHelper.FindProperty(lambdaExpression);
 
         public static Type GetMemberType(this MemberInfo memberInfo)
             => ReflectionHelper.GetMemberType(memberInfo);
 
-        /// <summary>
-        /// if targetType is oldType, method will return newType
-        /// if targetType is not oldType, method will return targetType
-        /// if targetType is generic type with oldType arguments, method will replace all oldType arguments on newType
-        /// </summary>
-        /// <param name="targetType"></param>
-        /// <param name="oldType"></param>
-        /// <param name="newType"></param>
-        /// <returns></returns>
-        public static Type ReplaceItemType(this Type targetType, Type oldType, Type newType)
-            => ReflectionHelper.ReplaceItemType(targetType, oldType, newType);
-
         public static IEnumerable<TypeInfo> GetDefinedTypes(this Assembly assembly) =>
             assembly.DefinedTypes;
 

src/AutoMapper.Extensions.ExpressionMapping/TypeExtensions.cs

@@ -1,4 +1,4 @@
-using AutoMapper.Configuration.Internal;
+using AutoMapper.Internal;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -124,7 +124,7 @@ public static bool IsNotPublic(this ConstructorInfo constructorInfo) => construc
 
         public static bool IsLiteralType(this Type type)
         {
-            if (PrimitiveHelper.IsNullableType(type))
+            if (type.IsNullableType())
                 type = Nullable.GetUnderlyingType(type);
 
             return LiteralTypes.Contains(type);
@@ -165,5 +165,11 @@ public static bool IsLiteralType(this Type type)
         public static MethodInfo GetSetMethod(this PropertyInfo propertyInfo) => propertyInfo.SetMethod;
 
         public static FieldInfo GetField(this Type type, string name) => type.GetRuntimeField(name);
+
+        public static bool IsQueryableType(this Type type)
+           => typeof(IQueryable).IsAssignableFrom(type);
+
+        public static Type GetGenericElementType(this Type type)
+            => type.HasElementType ? type.GetElementType() : type.GetTypeInfo().GenericTypeArguments[0];
     }
 }

src/AutoMapper.Extensions.ExpressionMapping/XpressionMapperVisitor.cs

@@ -38,11 +38,40 @@ protected override Expression VisitParameter(ParameterExpression node)
             return !pair.Equals(default(KeyValuePair<Type, MapperInfo>)) ? pair.Value.NewParameter : base.VisitParameter(node);
         }
 
+        private object GetConstantValue(object constantObject, string fullName, Type parentType)
+        {
+            return fullName.Split('.').Aggregate(constantObject, (parent, memberName) =>
+            {
+                MemberInfo memberInfo = parentType.GetFieldOrProperty(memberName);
+                parentType = memberInfo.GetMemberType();
+                return memberInfo.GetMemberValue(parent);
+            });
+        }
+
         protected override Expression VisitMember(MemberExpression node)
         {
             var parameterExpression = node.GetParameterExpression();
             if (parameterExpression == null)
+            {
+                var baseExpression = node.GetBaseOfMemberExpression();
+                if (baseExpression?.NodeType == ExpressionType.Constant)
+                {
+                    return this.Visit
+                    (
+                        Expression.Constant
+                        (
+                            GetConstantValue
+                            (
+                                ((ConstantExpression)baseExpression).Value,
+                                node.GetPropertyFullName(),
+                                baseExpression.Type
+                            )
+                        )
+                    );
+                }
+
                 return base.VisitMember(node);
+            }
 
             InfoDictionary.Add(parameterExpression, TypeMappings);
             return GetMappedMemberExpression(node.GetBaseOfMemberExpression(), new List<PropertyMapInfo>());
@@ -145,33 +174,58 @@ protected override Expression VisitMemberInit(MemberInitExpression node)
                 //The destination becomes the source because to map a source expression to a destination expression,
                 //we need the expressions used to create the source from the destination
 
-                IEnumerable<MemberBinding> bindings = node.Bindings.Select
-                (
-                    binding =>
-                    {
-                        Expression bindingExpression = ((MemberAssignment)binding).Expression;
-                        return DoBind
+                //IEnumerable<MemberBinding> bindings = node.Bindings.Select
+                //(
+                //    binding =>
+                //    {
+                //        Expression bindingExpression = ((MemberAssignment)binding).Expression;
+                //        return DoBind
+                //        (
+                //            GetSourceMember(typeMap.GetPropertyMapByDestinationProperty(binding.Member.Name)),
+                //            bindingExpression,
+                //            this.Visit(bindingExpression)
+                //        );
+                //    }
+                //);
+
+                IEnumerable<MemberBinding> bindings = node.Bindings.Aggregate(new List<MemberBinding>(), (list, binding) =>
+                {
+                    var propertyMap = typeMap.PropertyMaps.SingleOrDefault(item => item.DestinationName == binding.Member.Name);
+                    if (propertyMap == null)
+                        return list;
+
+                    Expression bindingExpression = ((MemberAssignment)binding).Expression;
+                    list.Add
+                    (
+                        DoBind
                         (
-                            typeMap.GetPropertyMapByDestinationProperty(binding.Member.Name),
+                            GetSourceMember(propertyMap),
                             bindingExpression,
                             this.Visit(bindingExpression)
-                        );
-                    }
-                );
+                        )
+                    );
+
+                    return list;
+                });
 
                 return Expression.MemberInit(Expression.New(newType), bindings);
             }
 
             return base.VisitMemberInit(node);
         }
 
-        private MemberBinding DoBind(PropertyMap propertyMap, Expression initial, Expression mapped)
+        private MemberBinding DoBind(MemberInfo sourceMember, Expression initial, Expression mapped)
         {
-            mapped = mapped.ConvertTypeIfNecessary(propertyMap.SourceMember.GetMemberType());
+            mapped = mapped.ConvertTypeIfNecessary(sourceMember.GetMemberType());
             this.TypeMappings.AddTypeMapping(ConfigurationProvider, initial.Type, mapped.Type);
-            return Expression.Bind(propertyMap.SourceMember, mapped);
+            return Expression.Bind(sourceMember, mapped);
         }
 
+        private MemberInfo GetSourceMember(PropertyMap propertyMap)
+            => propertyMap.CustomMapExpression != null
+                ? propertyMap.CustomMapExpression.GetMemberExpression()?.Member
+                : propertyMap.SourceMember;
+
         protected override Expression VisitBinary(BinaryExpression node)
         {
             return DoVisitBinary(this.Visit(node.Left), this.Visit(node.Right), this.Visit(node.Conversion));
@@ -261,7 +315,9 @@ Expression DoVisitUnary(Expression updated)
         protected override Expression VisitConstant(ConstantExpression node)
         {
             if (this.TypeMappings.TryGetValue(node.Type, out Type newType))
-                return base.VisitConstant(Expression.Constant(Mapper.Map(node.Value, node.Type, newType), newType));
+                return base.VisitConstant(Expression.Constant(Mapper.MapObject(node.Value, node.Type, newType), newType));
+            //Issue 3455 (Non-Generic Mapper.Map failing for structs in v10)
+            //return base.VisitConstant(Expression.Constant(Mapper.Map(node.Value, node.Type, newType), newType));
 
             return base.VisitConstant(node);
         }