C# 运行使用EF Core的并行异步任务时出现异常

我试图理解当db上下文被注入到类中时，如何处理使用实体框架的并行异步任务

我有一个显示大量总计的仪表板，我正在尝试运行并行返回这些总计的方法。目前，我有一些代码如下所示：

public class KpiRepository : IKpiRepository
{
    private readonly kpiContext _context;

    public KpiRepository(kpiContext context)
    {
        _context = context;
    }

    public Task<int> NonCompliantTotalCountAsync()
    {
        return _context.vw_SearchData
            .CountAsync(x => x.NonComplianceDate < DateTime.Today || x.DateDueOutOfService < DateTime.Today);
    }

    public Task<int> NonCompliantInNextWeekCountAsync()
    {
        return NonCompliantBetweenNowAndDateCountAsync(DateTime.Today.AddDays(7));
    }

    public Task<int> NonCompliantInNextMonthCountAsync()
    {
        return NonCompliantBetweenNowAndDateCountAsync(DateTime.Today.AddMonths(1));
    }

    private Task<int> NonCompliantBetweenNowAndDateCountAsync(DateTime endDate)
    {
        return _context.vw_SearchData
            .CountAsync(x => (x.NonComplianceDate >= DateTime.Today && x.NonComplianceDate <= endDate)
                || (x.DateDueOutOfService >= DateTime.Today && x.DateDueOutOfService <= endDate));
    }

    var taskNonCompliantInNextWeekCountAsync = NonCompliantInNextWeekCountAsync();
    var taskNonCompliantInNextMonthCountAsync = NonCompliantInNextMonthCountAsync();  

    Task.WaitAll(
        taskNonCompliantInNextWeekCountAsync,
        taskNonCompliantInNextMonthCountAsync
    );

    data.NonCompliantInNextWeekCount= taskNonCompliantInNextWeekCountAsync.Result;
    data.NonCompliantInNextMonthCount= taskNonCompliantInNextMonthCountAsync.Result;

公共类KpiRepository:IKpiRepository
{
私有只读kpiContext\u上下文；
公共KpiRepository（kpiContext上下文）
{
_上下文=上下文；
}
公共任务不符合TotalCountAsync（）
{
返回_context.vw_SearchData
.CountAsync（x=>x.NonComplianceDate.CountAsync（x=>（x.NonComplianceDate>=DateTime.Today&&x.NonComplianceDate=DateTime.Today&&x.DateDueOutOfService我添加了一个工厂类来创建上下文的新实例：

   public class KpiContextFactory: IKpiContextFactory
    {
        private string _connection = @"Server=.\SQL2008EXP;Database=kpiDb;Trusted_Connection=True;";

        public KpiContext GetNewContext()
        {
            var optionsBuilder = new DbContextOptionsBuilder<KpiContext>();
            optionsBuilder.UseSqlServer(_connection);

            return new KpiContext(optionsBuilder.Options);
        }
    }

公共类KpiContextFactory:IKpiContextFactory
{
私有字符串_connection=@“Server=。\SQL2008EXP；Database=kpiDb；Trusted_connection=True；”；
公共KpiContext GetNewContext（）
{
var optionsBuilder=new DbContextOptionsBuilder（）；
optionsBuilder.UseSqlServer（_连接）；
返回新的KpiContext（optionsBuilder.Options）；
}
}

现在我只需注入该工厂而不是上下文本身，然后调用
\u kpiContextFactory.GetNewContext（）.[method]
而不是
\u context.[method]
。这似乎工作正常