很显然我在星期三早上犯了一个愚蠢的错误。我有一个错误，我应该知道答案。对不起，愚蠢的问题。

var results1 = (from p in db1.a_PCRs
            join je in db1.a_Job_Extensions on p.PCR equals je.PCR
            join j in db1.Jobs on je.Job equals j.Job1
            join d in db1.Deliveries on j.Job1 equals d.Job
            where j.Status == "Active"
            where j.Job1.StartsWith("A")
            where p.PCR == "2552"
            where d.Shipped_Quantity > 0
            orderby d.Shipped_Date descending
            select new
            {
                p.PCR,
                d.Shipped_Date
            }).FirstOrDefault();

if (results1 != null)
{
    foreach (var result1 in results1)
    {
        lastDeliveryDate = result1.Shipped_Date;
    }

}else
{
    lastDeliveryDate = Convert.ToDateTime("1/1/1980");
}

错误发生在“results1”项目的foreach循环上。

Error   CS1579  foreach statement cannot operate on variables of type '<anonymous type: string PCR, DateTime? Shipped_Date>' because '<anonymous type: string PCR, DateTime? Shipped_Date>' does not contain a public instance or extension definition for 'GetEnumerator'

有谁能给我一个正确的方向吗？