diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/InsertNavProvider.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/InsertNavProvider.cs
index 8b7513be2..0639dd4e3 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/InsertNavProvider.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/InsertNavProvider.cs
@@ -93,21 +93,9 @@ namespace SqlSugar
         private InsertNavProvider<Root, TChild> _ThenInclude<TChild>(Expression<Func<T, List<TChild>>> expression) where TChild : class, new()
         {
             var name = ExpressionTool.GetMemberName(expression);
-            if (expression is LambdaExpression lambda) 
+            if (name == null)
             {
-                if (lambda.Body is MethodCallExpression method) 
-                {
-                    if (method.Method.Name == "ToList") 
-                    {
-                        if (method.Arguments.FirstOrDefault() is { } arg)
-                        {
-                            if (arg is MemberExpression member) 
-                            {
-                                name = member.Member.Name;
-                            }
-                        }
-                    }
-                }
+                name =ExpressionTool.GetMemberNameByMethod(expression, name);
             }
             var isRoot = false;
             if (this._ParentEntity == null)
@@ -137,7 +125,7 @@ namespace SqlSugar
                 InitParentList();
                 InsertManyToMany<TChild>(name, nav);
             }
-            AddContextInfo(name,isRoot);
+            AddContextInfo(name, isRoot);
             return GetResult<TChild>();
         }
 
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToMany.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToMany.cs
index 448bd0c0d..fdad7ec1c 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToMany.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToMany.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
@@ -137,6 +138,10 @@ namespace SqlSugar
                     }
                     children.AddRange(childs);
                 }
+                else if (childs == null && parentNavigateProperty.PropertyInfo.GetValue(item) is IList ilist && ilist != null && ilist.Count > 0)
+                {
+                    childs = GetIChildsBylList(children, thisFkColumn, parentValue, ilist);
+                }
                 ids.Add(parentValue);
                 if (_Options?.OneToManyNoDeleteNull == true && childs == null)
                 {
@@ -194,6 +199,16 @@ namespace SqlSugar
             _NavigateType = null;
             SetNewParent<TChild>(thisEntity, thisPkColumn);
         }
+        private static List<TChild> GetIChildsBylList<TChild>(List<TChild> children, EntityColumnInfo thisFkColumn, object parentValue, IList ilist) where TChild : class, new()
+        {
+            List<TChild> childs = ilist.Cast<TChild>().ToList();
+            foreach (var child in childs)
+            {
+                thisFkColumn.PropertyInfo.SetValue(child, parentValue, null);
+            }
+            children.AddRange(childs);
+            return childs;
+        }
 
         private static bool ParentIsPk(EntityColumnInfo parentNavigateProperty)
         {
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavProvider.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavProvider.cs
index e53829cef..7f55004cf 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavProvider.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavProvider.cs
@@ -97,6 +97,10 @@ namespace SqlSugar
             IsFirst = isRoot && this._ParentList == null;
             InitParentList();
             var name = ExpressionTool.GetMemberName(expression);
+            if (name == null)
+            {
+                name = ExpressionTool.GetMemberNameByMethod(expression, name);
+            }
             var nav = this._ParentEntity.Columns.FirstOrDefault(x => x.PropertyName == name);
             if (nav.Navigat == null)
             {
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
index 91d4d7158..9a8d20c44 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Common/ExpressionTool.cs
@@ -10,6 +10,29 @@ namespace SqlSugar
 {
     public class ExpressionTool
     {
+
+        public static string GetMemberNameByMethod(Expression expression, string name)  
+        {
+            if (expression is LambdaExpression lambda)
+            {
+                if (lambda.Body is MethodCallExpression method)
+                {
+                    if (method.Method.Name == "ToList")
+                    {
+                        if (method.Arguments.FirstOrDefault() is { } arg)
+                        {
+                            if (arg is MemberExpression member)
+                            {
+                                name = member.Member.Name;
+                            }
+                        }
+                    }
+                }
+            }
+
+            return name;
+        }
+
         internal static string ResolveMemberValue(ExpressionContext context, Expression item, string value)
         {
             if (item is MemberExpression member)
diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
index 4b3c4c8c5..babca7c16 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.1.4.188-preview03</version>
+    <version>5.1.4.188-preview09</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>