C# EF Core 3.0使用SingleOrDefault时出现下一个错误

我阅读了不同的解决方案，并尝试了不同的实现，但没有任何结果。 使用不同的实现时，错误始终相同：“System.InvalidOperationException:枚举器无法移动NextAsync。”

这就是生成异常的地方

var portfolioTrades = await _context
      .Portfolios
      .Include(PortfolioEntityTypeConfiguration.TradesList)
      .SingleOrDefaultAsync(x => x.id == id);

include的处理方式是

  builder.OwnsMany<Trade>(TradesList, x =>
            {
                x.WithOwner().HasForeignKey("portfolio_id");
                x.ToTable("product_trade", SchemaNames.Public);

                x.Property<TradeID>("id");
                x.Property<DateTimeOffset>("_date").HasColumnName("date");
                x.Property("_details").HasColumnName("details");
                x.Property<Guid>("_schemaId").HasColumnName("schema_id");

                x.HasKey(x => x.id);

            });

下面是实体

 public class Trade : Entity
{
    public TradeID id { get; private set; }

    private DateTimeOffset _date { get; set; }

    public JObject _details { get; set; }

    private Guid _schemaId { get; set; }

    private Trade()
    {
        id = new TradeID(Guid.NewGuid());
    }

    private Trade( DateTimeOffset date, string details, Guid schema_id)
    {
        id = new TradeID(Guid.NewGuid());
        _date = date;
        _schemaId = schema_id;
        _details = JsonConvert.DeserializeObject<JObject>(details);
    }

    internal static Trade Create(DateTimeOffset date, string details, Guid schema_id)
    {
        return new Trade(date, details, schema_id);
    }

}

公共类交易：实体
{
publictradeid id{get；private set；}
私有日期时间偏移量_日期{get；set；}
公共作业对象_详细信息{get；set；}
私有Guid_schemaId{get；set；}
私人贸易（）
{
id=新的TradeID（Guid.NewGuid（））；
}
私人交易（DateTimeOffset日期、字符串详细信息、Guid架构\u id）
{
id=新的TradeID（Guid.NewGuid（））；
_日期=日期；
_schemaId=schema_id；
_details=JsonConvert.DeserializeObject（details）；
}
内部静态交易创建（DateTimeOffset日期、字符串详细信息、Guid架构\u id）
{
返回新交易（日期、详细信息、模式id）；
}
}

}

public类公文包：实体，IAggregateRoot
{
公共PortfolioID id{get；private set；}
私有字符串_name{get；set；}
私有字符串_end_client_name{get；set；}
私有字符串_说明{get；set；}
私人只读列表交易；
私人投资组合（）
{
_交易=新列表（）；
}
}

//错误

System.InvalidOperationException: Enumerator failed to MoveNextAsync.
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Rx.Products.Infrastructure.Domain.Portfolios.PortfolioRepository.GetByPortfolioIdAsync(PortfolioID id) in ....\PortfolioRepository.cs:line 37
   at Rx.Products.Application.Portfolios.CreateTrade.CreateTradeCommandHandler.Handle(CreateTradeCommand request, CancellationToken cancellationToken) in ...\CreateTradeCommandHandler.cs:line 19
   at MediatR.Pipeline.RequestPreProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at MediatR.Pipeline.RequestPostProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at Rx.Products.API.TradesController.RegisterCustomer(CreateTradeRequest new_trade) in ....\TradesController.cs:line 65
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   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(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

HEADERS
=======
Accept: */*
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Length: 726
Content-Type: application/json
Host: localhost:54315
User-Agent: PostmanRuntime/7.24.1
Postman-Token: 2aabfa69-9d5c-4637-9d48-02a713077235

System.InvalidOperationException:枚举器无法移动NextAsync。
位于Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource]（IAsyncEnumerable`1 asyncEnumerable，CancellationToken CancellationToken）
位于Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource]（IAsyncEnumerable`1 asyncEnumerable，CancellationToken CancellationToken）
位于..\PortfolioRepository.cs:第37行中的Rx.Products.Infrastructure.Domain.PortfolioRepository.getByPortfolioIdeAsync（PortfolioID id）
在…\CreateTradeCommandHandler.cs:第19行中的Rx.Products.Application.portfolions.CreateTrade.CreateTradeCommandHandler.Handle（CreateTradeCommand请求，CancellationToken CancellationToken）处
在MediatR.Pipeline.RequestPreProcessorBehavior`2.Handle处（TRequest请求、CancellationToken CancellationToken、RequestHandlerDelegate`1下一步）
在MediatR.Pipeline.RequestPostProcessorBehavior`2.Handle处（TRequest请求、CancellationToken取消令牌、RequestHandlerDelegate`1下一步）
在..\TradesController.cs中的Rx.Products.API.TradesController.RegisterCustomer（CreateTradeRequest new\u trade）处
位于Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute（IActionResultTypeMapper映射器、ObjectMethodExecutor执行器、对象控制器、对象[]参数）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g|u等待| 12_0（ControllerActionInvoker invoker，ValueTask`1 actionResultValueTask）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g_u等待| 10_0（ControllerActionInvoker invoker，Task lastTask，State next，Scope Scope，Object State，Boolean isCompleted）
位于Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow（ActionExecutedContextSealed上下文）
位于Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next（状态和下一步、范围和范围、对象和状态、布尔值和isCompleted）
在Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g_u等待| 13_0（ControllerActionInvoker invoker，Task lastTask，State next，Scope Scope，Object State，Boolean isCompleted）
在Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g_|19_0（ResourceInvoker invoker、Task lastTask、State next、Scope Scope、Object State、Boolean isCompleted）
在Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g|u waiting | 17|0（ResourceInvoker invoker，Task Task，IDisposable作用域）
位于Microsoft.AspNetCore.Routing.EndpointMiddleware.g_uwaitRequestTask | 6_0（端点、任务请求任务、ILogger记录器）
位于Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke（HttpContext上下文）
位于Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke（HttpContext上下文）
标题
=======
接受：*/*
接受编码：gzip，deflate，br
连接：保持活力
内容长度：726
内容类型：application/json
主机：本地主机：54315
用户代理：PostmanRuntime/7.24.1
邮递员代币：2aabfa69-9d5c-4637-9d48-02a713077235

结果将生成相同的错误。 谢谢你抽出时间

我认为，拥有一个公共的

投资组合.Trades

属性，可以用于导航，并定义

投资组合

类和

交易

类之间的关系，这将真正帮助您

public类公文包：实体，IAggregateRoot
{
//上面定义的其他类成员。。。
//关系的新公共导航属性。
公共IReadOnlyList Trades=>\u Trades.AsReadOnly（）；
}

如果使用

OwnsMany

关系，则不需要在查询中使用

.Include

语句。如果使用

具有多个

关系，则需要使用

.Include

语句

使用

有许多

和

包括

：

builder.HasMany（port.Trades，x=>
{
//上面定义的其他配置代码。。。
});
var portfolioTrades=等待上下文
.投资组合
.Include（port=>port.Trades）
.SingleOrDefaultAsync（port=>port.id==id）；

使用

OwnsMany

而不是

Include

：

builder.OwnsMany（port.Trades，x=>
{
//上面定义的其他配置代码。。。
});
var portfolioTrades=等待上下文
.投资组合
.SingleOrDefaultAsync（port=>port.id==id）；

使用

public class Portfolio : Entity, IAggregateRoot
{
    public PortfolioID id { get; private set; }

    private string _name { get; set; }

    private string _end_client_name { get; set; }

    private string _description { get; set; }

    private readonly List<Trade> _trades;

    private Portfolio()
    {
       _trades = new List<Trade>();
    }
}

System.InvalidOperationException: Enumerator failed to MoveNextAsync.
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.SingleOrDefaultAsync[TSource](IAsyncEnumerable`1 asyncEnumerable, CancellationToken cancellationToken)
   at Rx.Products.Infrastructure.Domain.Portfolios.PortfolioRepository.GetByPortfolioIdAsync(PortfolioID id) in ....\PortfolioRepository.cs:line 37
   at Rx.Products.Application.Portfolios.CreateTrade.CreateTradeCommandHandler.Handle(CreateTradeCommand request, CancellationToken cancellationToken) in ...\CreateTradeCommandHandler.cs:line 19
   at MediatR.Pipeline.RequestPreProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at MediatR.Pipeline.RequestPostProcessorBehavior`2.Handle(TRequest request, CancellationToken cancellationToken, RequestHandlerDelegate`1 next)
   at Rx.Products.API.TradesController.RegisterCustomer(CreateTradeRequest new_trade) in ....\TradesController.cs:line 65
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   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(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

HEADERS
=======
Accept: */*
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Content-Length: 726
Content-Type: application/json
Host: localhost:54315
User-Agent: PostmanRuntime/7.24.1
Postman-Token: 2aabfa69-9d5c-4637-9d48-02a713077235