- 增加 UnitOfWorkManager 工作单元管理器，实现多种传播事务；#289

Examples/aspnetcore_transaction/TransactionalAttribute.cs

@@ -0,0 +1,51 @@
+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.Requierd;
+        public IsolationLevel? IsolationLevel { get; set; }
+
+        [DynamicProxyFromServices]
+        UnitOfWorkManager _uowManager;
+        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.IsolationLevel);
+            return Task.FromResult(false);
+        }
+        Task OnAfter(Exception ex)
+        {
+            try
+            {
+                if (ex == null) _uow.Commit();
+                else _uow.Rollback();
+            }
+            finally
+            {
+                _uow.Dispose();
+            }
+            return Task.FromResult(false);
+        }
+    }
+}