Foreach循环(即循环ef模型)中的Async/Await生成错误

System.InvalidOperationException
  HResult=0x80131509
  Message=Error generated for warning 'Microsoft.EntityFrameworkCore.Infrastructure.LazyLoadOnDisposedContextWarning: An attempt was made to lazy-load navigation property 'Company' on entity type 'RecurringInvoiceTemplateProxy' after the associated DbContext was disposed.'. This exception can be suppressed or logged by passing event ID 'CoreEventId.LazyLoadOnDisposedContextWarning' to the 'ConfigureWarnings' method in 'DbContext.OnConfiguring' or 'AddDbContext'.
  Source=Microsoft.EntityFrameworkCore
  StackTrace:
   at Microsoft.EntityFrameworkCore.Diagnostics.EventDefinition`2.Log[TLoggerCategory](IDiagnosticsLogger`1 logger, WarningBehavior warningBehavior, TParam1 arg1, TParam2 arg2, Exception exception)
   at Microsoft.EntityFrameworkCore.Internal.CoreLoggerExtensions.LazyLoadOnDisposedContextWarning(IDiagnosticsLogger`1 diagnostics, DbContext context, Object entityType, String navigationName)
   at Microsoft.EntityFrameworkCore.Internal.LazyLoader.ShouldLoad(Object entity, String navigationName, NavigationEntry& navigationEntry)
   at Microsoft.EntityFrameworkCore.Internal.LazyLoader.Load(Object entity, String navigationName)
   at Microsoft.EntityFrameworkCore.Proxies.Internal.LazyLoadingInterceptor.Intercept(IInvocation invocation)
   at Castle.DynamicProxy.AbstractInvocation.Proceed()
   at Castle.Proxies.RecurringInvoiceTemplateProxy.get_Company()
   at SourceLine.Api.Services.InvoicingService.<>c__DisplayClass48_0.<GenerateRecurringInvoicesAsync>b__0(CustomerDto x) in 1299
   at System.Linq.Enumerable.TryGetFirst[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found)
   at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
   at SourceLine.Api.Services.InvoicingService.<GenerateRecurringInvoicesAsync>d__48.MoveNext() in line 1299
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

我的问题

 return dbContext.RecurringInvoiceTemplates.Include(x => x.Company)
                                              .Include(x => x.RecurringInvoiceFrequency)
                                              .Where(x => x.NextRun.Date.CompareTo(currentTime.Date) <= 0).ToList();

它死在哪里

    foreach (var r in recurringInvoices){
     var foundCustomer = allCustomers.FirstOrDefault(x => x.Id == r.Company.Identifier);
}

更新

问题可能就是因为这个

public async void Get(){

    var recurringInvoices = dbContext.RecurringInvoiceTemplates.Include(x => x.Company)
                                                  .Include(x => x.RecurringInvoiceFrequency)
                                                  .Where(x => 
    var allCustomer = new List<Dto>(){
        new Dto(){
            Id = 1
        }
    }

    foreach (var r in recurringInvoices)
    {
        //allcustomers is not en EF object, just a dto.
        var foundCustomer = allCustomers.FirstOrDefault(x => x.Id == r.Company.Identifier);

        if (foundCustomer != null)
        {

                var ApiKey = configuration["SendGrid:Key"];
                var sendGridClient = new SendGridClient(ApiKey);

                var msg = new SendGridMessage();
                msg.SetFrom(new EmailAddress("example@test.com, "Example User"));


                msg.SetTemplateId("d-f06bfad7374b4a3cb2ccbf846d8e96a4");


                var dynamicTemplateData = new SendInvoiceTemplateDto
                {
                    Subject = "a",
                    Body = "b"
                };

                msg.SetTemplateData(dynamicTemplateData);

                var response = await sendGridClient.SendEmailAsync(msg);
            }
        }
}

编辑2

我不明白但是当我使用

 var response = sendGridClient.SendEmailAsync(msg);
response.Wait();