diff --git a/Examples/aspnetcore_transaction/TransactionalAttribute.cs b/Examples/aspnetcore_transaction/TransactionalAttribute.cs
index 049575c1..71f8cbc4 100644
--- a/Examples/aspnetcore_transaction/TransactionalAttribute.cs
+++ b/Examples/aspnetcore_transaction/TransactionalAttribute.cs
@@ -15,7 +15,8 @@ namespace FreeSql
     public class TransactionalAttribute : DynamicProxyAttribute, IActionFilter
     {
         public Propagation Propagation { get; set; } = Propagation.Requierd;
-        public IsolationLevel? IsolationLevel { get; set; }
+        public IsolationLevel IsolationLevel { get => _IsolationLevelPriv.Value; set => _IsolationLevelPriv = value; }
+        IsolationLevel? _IsolationLevelPriv;
 
         [DynamicProxyFromServices]
         UnitOfWorkManager _uowManager;
@@ -31,7 +32,7 @@ namespace FreeSql
 
         Task OnBefore(UnitOfWorkManager uowm)
         {
-            _uow = uowm.Begin(this.Propagation, this.IsolationLevel);
+            _uow = uowm.Begin(this.Propagation, this._IsolationLevelPriv);
             return Task.FromResult(false);
         }
         Task OnAfter(Exception ex)
diff --git a/Examples/base_entity/readme.md b/Examples/base_entity/readme.md
index 6a8bde3b..de64368d 100644
--- a/Examples/base_entity/readme.md
+++ b/Examples/base_entity/readme.md
@@ -93,7 +93,7 @@ var items = UserGroup.Where(a => a.Id > 10).ToList();
 
 # 事务建议
 
-由于 AsyncLocal 平台兼容不好，所以交给外部管理。
+由于 AsyncLocal 平台兼容不好，所以交给外部管理事务。
 
 ```csharp
 static AsyncLocal<IUnitOfWork> _asyncUow = new AsyncLocal<IUnitOfWork>();
diff --git a/Extensions/FreeSql.Extensions.BaseEntity/readme.md b/Extensions/FreeSql.Extensions.BaseEntity/readme.md
index 1c347ded..32425019 100644
--- a/Extensions/FreeSql.Extensions.BaseEntity/readme.md
+++ b/Extensions/FreeSql.Extensions.BaseEntity/readme.md
@@ -93,7 +93,7 @@ var items = UserGroup.Where(a => a.Id > 10).ToList();
 
 # 事务建议
 
-由于 AsyncLocal 平台兼容不好，所以交给外部管理。
+由于 AsyncLocal 平台兼容不好，所以交给外部管理事务。
 
 ```csharp
 static AsyncLocal<IUnitOfWork> _asyncUow = new AsyncLocal<IUnitOfWork>();