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Furion 版本号

2.9.3

Web 项目类型

• WebApi
• Mvc
• Razor Pages
• Blazor Server

描述你的问题

我通过messageCenter发布一个事件后，执行了一个方法，方法执行如下方法，其中skus（是实体类的Sku的数组）是事件总线发布的参数

        Scoped.Create((_, scope) =>
        {                
            var services = scope.ServiceProvider;

            var service = (ISkuService)services.GetService(typeof(ISkuService));
            service.GenerateSkuT(skus);
        });

然后再genergeSkuT里边执行了

通过sku数组根据一定的规则生成skuts（实体类SkuT）数组.
最后执行 (1)skuts.ForEach(r=>r.Insert()); (2) sql.SqlNonQuery()//sql是某个语句
然后提交保存 rep.Context.SaveChanges();
如上执行 如果只执行1，则系统不报错但是数据库没有插入，如果执行了1和2，则2报错如下堆栈

然后通过改变方法。（1） skuts.ForEach(r => { rep.Insert(r); }); （2）rep.Context.Database.ExecuteNonQuery(sql); 然后提交保存 rep.Context.SaveChanges();则提交成功

根据错误提示，和变通代码的成功，猜测可能是数据库上下文串线程和作用域了，可能是主线程里的context执行完被disposed，影响到了另外一个线程的context也被释放了，是不是可以考虑用ThreadLocal线程安全来管理数据库上下文。另外使用Scoped.CreateUow同样会出现别的错误。

异常堆栈信息

Cannot access a disposed context instance. A common cause of this error is disposing a context instance that was resolved from dependency injection and then later trying to use the same context instance elsewhere in your application. This may occur if you are calling 'Dispose' on the context instance, or wrapping it in a using statement. If you are using dependency injection, you should let the dependency injection container take care of disposing context instances.
Object name: 'DefaultDbContext'.
at MySqlConnector.Core.ServerSession.StartQuerying(ICancellableCommand command) in //src/MySqlConnector/Core/ServerSession.cs:line 290
at MySqlConnector.Core.CommandExecutor.d__0.MoveNext() in //src/MySqlConnector/Core/CommandExecutor.cs:line 56
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MySqlConnector.MySqlCommand.d__69.MoveNext() in /_/src/MySqlConnector/MySqlCommand.cs:line 266
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter1.GetResult() at MySqlConnector.MySqlCommand.ExecuteNonQuery() in /_/src/MySqlConnector/MySqlCommand.cs:line 101 at StackExchange.Profiling.Data.ProfiledDbCommand.ExecuteNonQuery() in C:\projects\dotnet\src\MiniProfiler.Shared\Data\ProfiledDbCommand.cs:line 288 at Furion.DatabaseAccessor.SqlAdoNetExtensions.ExecuteNonQuery(DatabaseFacade databaseFacade, String sql, DbParameter[] parameters, CommandType commandType) at Furion.DatabaseAccessor.PrivateSqlRepository.SqlNonQuery(String sql, DbParameter[] parameters) at Furion.DatabaseAccessor.SqlStringExecutePart.SqlNonQuery(DbParameter[] parameters) at Furion.DatabaseAccessor.Extensions.SqlStringExecuteExtensions.SqlNonQuery(String sql, DbParameter[] parameters) at LL.Refound.Core.Service.SkuService.GenerateSkuT(Object skuso) inService\Sku\SkuService.cs:line 279 at LL.Refound.Core.Service.SkuChangeSubscribeHandler.<>c__DisplayClass3_0.<DealSku>b__0(IServiceScopeFactory _, IServiceScope scope) in xxxx\Service\Sku\Event\SkuChangeSubscribeHandler.cs:line 60 at Furion.DependencyInjection.Scoped.Create(Action2 handler, IServiceScopeFactory scopeFactory)
at LL.Refound.Core.Service.SkuChangeSubscribeHandler.DealSku(Sku[] skus) in xxxx\Service\Sku\Event\SkuChangeSubscribeHandler.cs:line 52
at LL.Refound.Core.Service.SkuChangeSubscribeHandler.CreateSku(String eventId, Object payload) in xxxx\Service\Sku\Event\SkuChangeSubscribeHandler.cs:line 39
at Furion.EventBus.InternalMessageCenter.<>c__DisplayClass7_1.<b__0>d.MoveNext()

代码或代码仓库

//SkuService:ISkuService
public class SkuService : BaseController, ISkuService, ITransient
    {
        public IRepository<Sku> _skuRep;  // 菜单表仓储  
      public   SkuService （）{
        
            //注入rep
    }

        [HttpPost("batchCreate")]
        public async Task batchCreate()
        {
              List<Sku> skus = new List<Sku>();
            for (var i = 0; i < 3; i++)
            {
                var Sku = new Sku() { Id = 3 + i, Cn = "测试" + i, En = "1" };
                Sku.Insert();
                skus.Add(Sku);
            }
            _skuRep.Context.SaveChanges();

            Debug.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString());
            MessageCenter.Send("create:Sku", skus.ToArray());
        }

         [NonAction]
        public void GenerateSkuT(Sku[] skus)
        {
            Debug.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString());
            for (var i = 0; i < 2; i++)
            {
                var Sku = new SkuT() { Id = i, Cn = "SKUT测试" + i, En = "1" };
                _skuRepository.Context.Add<SkuT>(Sku);
                //Sku.Insert();

            }


            string sql = "update sku set Cn ='sdf' where id =3";

            sql.SqlNonQuery();
            _skuRepository.Context.SaveChanges();

        }
}
   //事件
 public class SkuChangeSubscribeHandler : ISubscribeHandler
    {

        // 定义一条消息
        [SubscribeMessage("create:Sku")]
        public void CreateSku(string eventId, object payload)
        {
            Debug.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString());
            DealSku((Sku[])payload);


        }

        public void DealSku(Sku[] skus)
        {


            Scoped.Create((_, scope) =>
            {
                Debug.WriteLine(Thread.CurrentThread.ManagedThreadId.ToString());
                var services = scope.ServiceProvider;

                var service = (TestService)services.GetService(typeof(TestService));
                service.GenerateSkuT(skus);
            });

        }
    }

数据库信息

• Sqlite
• SqlServer
• Mysql
• Oracle
• PGSql
• Firebird
• Cosmos

期待结果

我的需求是，当用户批量导入数据后，快速提交并相应成功，通过异步事件方法GenerateSkuT去执行其他多余的任务（这个任务可能很繁琐）。
另外针对单个操作A方法，我用UnitOfWork， 我希望在数据提交后再发布事件去执行其他的操作，除了手动提交外有没有其他办法