在 EF Core 3.1 中删除多行时出错 "Failed to compare two elements in the array - At least one object must implement IComparable"

Question

我使用 EF Core 3.1，这是我的代码：

public async Task DeleteSessions(List<Guid> ids)
{
    var sessions = new List<Session>();
    foreach (var sessionId in ids)
    {
        var session = await _dbContext.Sessions.FindAsync(sessionId);
        sessions.Add(session);
    }

    _dbContext.Sessions.RemoveRange(sessions);

    // error occurred on this line
    await _dbContext.SaveChangesAsync();
}

但在 SaveChagedAsync 上抛出异常并出现此错误

Failed to compare two elements in the array - At least one object must implement IComparable

我也将代码更改为：

public async Task DeleteSessions(List<Guid> ids)
{
     foreach (var sessionId in ids)
     {
          var session = await _dbContext.Sessions.FindAsync(sessionId);
          _dbContext.Sessions.Remove(session);
     }

     // error occurred on this line
     await _dbContext.SaveChangesAsync();
 }

但没关系，SaveChagedAsync 方法再次抛出异常

如果我逐一删除并调用 SaveChangedAsync 该方法可以正常工作，但我需要在一个事务中删除多行。

为什么 EF Core 不支持多行删除？以及如何解决这个问题？

更多信息：

    public class Session
    {
        public BusinessId Id { get; private set; }

        public string Title { get; private set; }

        public DateTime StartDate { get; private set; }

        public int ExtraDurationAsMinute { get; private set; }

        public string LatestServerId { get; private set; }

        public Courses.Course Course { get; private set; }

        private Session()
        {
        }

        public static async Task<Session> Create(Guid sessionId, Courses.Course course, DateTime startDate, string title)
        {
            var session = new Session
            {
                Id = sessionId,
                Course = course
            };

            session.ChangeStartDate(startDate);
            session.ChangeTitle(title);

            return session;
        }

        public void ChangeServer(string serverId)
        {
            this.LatestServerId = serverId;
        }

        public void ChangeTitle(string title)
        {
            if (Title == title)
            {
                return;
            }

            this.Title = title;
        }

        public void ChangeStartDate(DateTime startDate)
        {
            if (StartDate == startDate)
            {
                return;
            }

            this.StartDate = startDate;

            Course.CalculateFirstAndLastSession();
        }

        public void ChangeExtraDuration(int duration)
        {
            if (ExtraDurationAsMinute == duration)
            {
                return;
            }

            ExtraDurationAsMinute = duration;

            Course.CalculateFirstAndLastSession();
        }

    }

这是 EF 会话配置：

public class SessionConfiguration : IEntityTypeConfiguration<Core.DomainModels.Sessions.Session>
    {
        public void Configure(EntityTypeBuilder<Core.DomainModels.Sessions.Session> builder)
        {
            builder.Property(x => x.Id)
                .HasConversion(x => x.Value,
                    x => BusinessId.FromGuid(x));

            builder.Property(x => x.LatestServerId).HasMaxLength(100);

            builder.HasOne(x => x.Course);
        }
    }

这是异常堆栈跟踪：

   at System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer)
   at System.Array.Sort[T](T[] array, Int32 index, Int32 length, IComparer`1 comparer)
   at System.Collections.Generic.List`1.Sort(Int32 index, Int32 count, IComparer`1 comparer)
   at Microsoft.EntityFrameworkCore.Update.Internal.CommandBatchPreparer.<BatchCommands>d__11.MoveNext()
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.<ExecuteAsync>d__8.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.<ExecuteAsync>d__8.MoveNext()
   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.TaskAwaiter`1.GetResult()
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<SaveChangesAsync>d__97.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<SaveChangesAsync>d__101.MoveNext()
   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.TaskAwaiter`1.GetResult()
   at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.<ExecuteAsync>d__7`2.MoveNext()
   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.TaskAwaiter`1.GetResult()
   at Microsoft.EntityFrameworkCore.DbContext.<SaveChangesAsync>d__54.MoveNext()
   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.TaskAwaiter`1.GetResult()
   at SilverPath.Infra.Data.Sql.Commands.BaseEntityFrameworkUnitOfWork`1.<CommitAsync>d__5.MoveNext() in O:\Projects\SpAzure\Elearno-Reborn\Institute\Develop\Framework\SilverPath.Infra.Data.Sql.Commands\BaseEntityFrameworkUnitOfWork.cs:line 32
   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.TaskAwaiter`1.GetResult()
   at ElearnoInstitute.Core.ApplicationServices.Sessions.Command.SaveSessions.SaveSessionHandler.<Handle>d__2.MoveNext() in O:\Projects\SpAzure\Elearno-Reborn\Institute\Develop\Institute\src\Core\ElearnoInstitute.Core.ApplicationServices\Sessions\Command\SaveSessions\SaveSessionHandler.cs:line 83
   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.TaskAwaiter`1.GetResult()
   at SilverPath.Framework.EndPoints.Web.Controllers.BaseApiController.<Execute>d__11`1.MoveNext() in O:\Projects\SpAzure\Elearno-Reborn\Institute\Develop\Framework\SilverPath.EndPoints.Web\Controllers\BaseApiController.cs:line 66
   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.TaskAwaiter`1.GetResult()
   at ElearnoInstitute.Endpoint.ClientApi.Controllers.V1.SessionController.<SaveSession>d__3.MoveNext() in O:\Projects\SpAzure\Elearno-Reborn\Institute\Develop\Institute\src\Endpoint\ElearnoInstitute.Endpoint.ClientApi\Controllers\V1\SessionController.cs:line 85
   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.TaskAwaiter`1.GetResult()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.<Execute>d__0.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Threading.Tasks.ValueTask`1.get_Result()
   at System.Runtime.CompilerServices.ValueTaskAwaiter`1.GetResult()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<<InvokeActionMethodAsync>g__Logged|12_1>d.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<<InvokeNextActionFilterAsync>g__Awaited|10_0>d.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<<InvokeInnerFilterAsync>g__Awaited|13_0>d.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<<InvokeNextResourceFilter>g__Awaited|24_0>d.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<<InvokeFilterPipelineAsync>g__Awaited|19_0>d.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<<InvokeAsync>g__Logged|17_1>d.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<<Invoke>g__AwaitRequestTask|6_0>d.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.<Invoke>d__5.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.<Invoke>d__6.MoveNext()
   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.TaskAwaiter.GetResult()
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.<Invoke>d__5.MoveNext()
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.<Invoke>d__4.MoveNext()
   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.TaskAwaiter.GetResult()
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.<Invoke>d__3.MoveNext()
   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.TaskAwaiter.GetResult()
   at SilverPath.Framework.EndPoints.Web.Middlewares.ApiExceptionHandler.ApiExceptionMiddleware.<Invoke>d__5.MoveNext() in O:\Develop\Framework\EndPoints.Web\Middlewares\ApiExceptionHandler\ApiExceptionMiddleware.cs:line 35

Answer 1

Ef 在更新行时需要一个确定的顺序，因为如果有两个线程更新相同的行并且顺序颠倒可能会导致死锁看到这个 SaveChanges() deadlocks

所以

BusinessId should implement IComparable<BusinessId>

您的问题将得到解决:)

在 EF Core 3.1 中删除多行时出错 "Failed to compare two elements in the array - At least one object must implement IComparable"

Error "Failed to compare two elements in the array - At least one object must implement IComparable" for delete multiple row in EF Core 3.1

c#

ef-core-3.1