update demo

Examples/aspnetcore_transaction/TransactionalAttribute02.cs

@@ -0,0 +1,54 @@
+//using FreeSql;
+//using Microsoft.AspNetCore.Mvc.Filters;
+//using System;
+//using System.Collections.Generic;
+//using System.Data;
+//using System.Text;
+//using System.Threading.Tasks;
+
+//namespace FreeSql
+//{
+//    /// <summary>
+//    /// 使用事务执行，请查看 Program.cs 代码开启动态代理
+//    /// </summary>
+//    [AttributeUsage(AttributeTargets.Method)]
+//    public class TransactionalAttribute : DynamicProxyAttribute, IActionFilter
+//    {
+//        public Propagation Propagation { get; set; } = Propagation.Required;
+//        public IsolationLevel IsolationLevel { get => _IsolationLevelPriv.Value; set => _IsolationLevelPriv = value; }
+//        IsolationLevel? _IsolationLevelPriv;
+
+//        [DynamicProxyFromServices]
+//#pragma warning disable IDE0044 // 添加只读修饰符
+//        UnitOfWorkManager _uowManager;
+//#pragma warning restore IDE0044 // 添加只读修饰符
+//        IUnitOfWork _uow;
+
+//        public override Task Before(DynamicProxyBeforeArguments args) => OnBefore(_uowManager);
+//        public override Task After(DynamicProxyAfterArguments args) => OnAfter(args.Exception);
+
+//        //这里是为了 controller 
+//        public void OnActionExecuting(ActionExecutingContext context) => OnBefore(context.HttpContext.RequestServices.GetService(typeof(UnitOfWorkManager)) as UnitOfWorkManager);
+//        public void OnActionExecuted(ActionExecutedContext context) => OnAfter(context.Exception);
+
+
+//        Task OnBefore(UnitOfWorkManager uowm)
+//        {
+//            _uow = uowm.Begin(this.Propagation, this._IsolationLevelPriv);
+//            return Task.FromResult(false);
+//        }
+//        Task OnAfter(Exception ex)
+//        {
+//            try
+//            {
+//                if (ex == null) _uow.Commit();
+//                else _uow.Rollback();
+//            }
+//            finally
+//            {
+//                _uow.Dispose();
+//            }
+//            return Task.FromResult(false);
+//        }
+//    }
+//}