diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/DynamicBuilder/DynamicProperyBuilder.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/DynamicBuilder/DynamicProperyBuilder.cs
index 844aae624..3a002e327 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/DynamicBuilder/DynamicProperyBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/DynamicBuilder/DynamicProperyBuilder.cs
@@ -68,7 +68,7 @@ namespace SqlSugar
         }
 
         #region BuilderTypes
-        public (Type a, Type b) BuilderTypes(DynamicProperyBuilder dynamicBuilderB)
+        public Tuple<Type, Type> BuilderTypes(DynamicProperyBuilder dynamicBuilderB)
         {
             if (IsCache)
             {
@@ -76,25 +76,24 @@ namespace SqlSugar
                 var key2 = dynamicBuilderB.baseBuilder.entityName + string.Join("_", dynamicBuilderB.baseBuilder.propertyAttr.Select(it => it.Name + it.Type.Name));
                 return new ReflectionInoCacheService().GetOrCreate(key1 + key2, () =>
                 {
-                    (Type, Type) result = GetBuilderTypes(dynamicBuilderB);
+                    Tuple<Type, Type> result = GetBuilderTypes(dynamicBuilderB);
                     return result;
                 });
             }
             else
             {
-                (Type, Type) result = GetBuilderTypes(dynamicBuilderB);
+                Tuple<Type, Type> result = GetBuilderTypes(dynamicBuilderB);
                 return result;
             }
         }
-        private (Type, Type) GetBuilderTypes(DynamicProperyBuilder dynamicBuilderB)
+        private Tuple<Type,Type> GetBuilderTypes(DynamicProperyBuilder dynamicBuilderB)
         {
             DynamicProperyBuilder dynamicBuilderA = this;
             TypeBuilder typeBuilderA = EmitTool.CreateTypeBuilder(dynamicBuilderA.baseBuilder.entityName, TypeAttributes.Public, dynamicBuilderA.baseBuilder.baseType, dynamicBuilderA.baseBuilder.interfaces);
             TypeBuilder typeBuilderB = EmitTool.CreateTypeBuilder(dynamicBuilderB.baseBuilder.entityName, TypeAttributes.Public, dynamicBuilderB.baseBuilder.baseType, dynamicBuilderB.baseBuilder.interfaces);
             DynamicBuilderHelper.CreateDynamicClass(typeBuilderA, typeBuilderB, dynamicBuilderA.baseBuilder.propertyAttr, dynamicBuilderA.baseBuilder.entityAttr);
             DynamicBuilderHelper.CreateDynamicClass(typeBuilderB, typeBuilderA, dynamicBuilderB.baseBuilder.propertyAttr, dynamicBuilderB.baseBuilder.entityAttr);
-            var result = (typeBuilderA.CreateTypeInfo().AsType(), typeBuilderB.CreateTypeInfo().AsType());
-            return result;
+            return new Tuple<Type, Type>(typeBuilderA.CreateTypeInfo().AsType(), typeBuilderB.CreateTypeInfo().AsType());
         } 
         #endregion