ISupportInitialize support

Dapper NET40/SqlMapper.cs

@@ -2850,6 +2850,7 @@ public static void SetTypeMap(Type type, ITypeMap map)
 
             ConstructorInfo specializedConstructor = null;
 
+            bool supportInitialize = false;
             if (type.IsValueType)
             {
                 il.Emit(OpCodes.Ldloca_S, (byte)1);
@@ -2874,6 +2875,12 @@ public static void SetTypeMap(Type type, ITypeMap map)
                 {
                     il.Emit(OpCodes.Newobj, ctor);
                     il.Emit(OpCodes.Stloc_1);
+                    supportInitialize = typeof(ISupportInitialize).IsAssignableFrom(type);
+                    if(supportInitialize)
+                    {
+                        il.Emit(OpCodes.Ldloc_1);
+                        il.EmitCall(OpCodes.Callvirt, typeof(ISupportInitialize).GetMethod("BeginInit"), null);
+                    }
                 }
                 else
                     specializedConstructor = ctor;
@@ -3120,6 +3127,11 @@ public static void SetTypeMap(Type type, ITypeMap map)
                     il.Emit(OpCodes.Newobj, specializedConstructor);
                 }
                 il.Emit(OpCodes.Stloc_1); // stack is empty
+                if (supportInitialize)
+                {
+                    il.Emit(OpCodes.Ldloc_1);
+                    il.EmitCall(OpCodes.Callvirt, typeof(ISupportInitialize).GetMethod("EndInit"), null);
+                }
             }
             il.MarkLabel(allDone);
             il.BeginCatchBlock(typeof(Exception)); // stack is Exception

Tests/Tests.cs

@@ -2878,6 +2878,29 @@ public void DataTableParameters()
             }
         }
 
+        public void SupportInit()
+        {
+            var obj = connection.Query<WithInit>("select 'abc' as Value").Single();
+            obj.Value.Equals("abc");
+            obj.Flags.Equals(31);
+        }
+
+        class WithInit : ISupportInitialize
+        {
+            public string Value { get; set; }
+            public int Flags { get;set; }
+
+            void ISupportInitialize.BeginInit()
+            {
+                Flags += 1;
+            }
+
+            void ISupportInitialize.EndInit()
+            {
+                Flags += 30;
+            }
+        }
+
 #if POSTGRESQL
 
         class Cat