相同的“哪里”每次返回不同的结果

Question

I have a .NET service (using Entity Framework 6.0.0-rc-1)

public class MyController : ApiController
{
    protected DbConnection _connection = new DbConnection();

    public HttpResponseMessage MyProcedure1()
    {
        ...
        var dayPlans = _connection.DayPlans
                          .Where(dp => dp.period >= start && dp.period < end);
        if (dayPlans.Count() > 0)
        {
            //success
        }
        else
        {
            //fail
        }
        ...
    }

    public HttpResponseMessage MyProcedure2()
    {
        ...
        var dayPlans = _connection.DayPlans
                          .Where(dp => dp.period >= start && dp.period < end);
        if (dayPlans.Count() > 0)
        {
            //success
        }
        else
        {
            //fail
        }
        ...
    }
}

These procedures being used simultaneously by client side. The thing is from time to time dayPlans.Count() equals zero while it should not. I've double checked filtration params and database content, there are few records that has to be selected from db, but they are not.

Another important moment is when LINQ request in one method fails, it always fails in another. But when these procedures are called one after another they might fail in all possible variants - first request failed, second succeeded; first failed second failed; etc.

What might be the problem?

Answer 1

那是我的错误，日期边界计算不正确