为什么我在将通用列表转换为相同的列表类型时不断收到错误消息？

Question

我遇到了这个错误

无法从“System.Collections.Generic.List”转换为“HWC.DataAccess.FAREmailList”HWC.DataAccess

我不理解这个错误，因为它是相同的列表类型

这是我正在使用的方法

public void PrepareToSendEmailFromFAR(int id)
{
    HWC = new HWCEntities();

    FileAReport far = HWC.FileAReports.Where(w => w.FileAReportID == id).FirstOrDefault();

    List<FAREmailList> emailList = null;



    if(far.DistrictID != 0)
    {
        emailList = new List<FAREmailList>();
        var query = from dcx in HWC.DistrictContactXREFs
                    where
                      dcx.DistrictID == far.DistrictID
                    select new
                    {
                        dcx.ContactID,
                        dcx.Contact.ContactEmail,
                        dcx.Contact.ContactName
                    };

        foreach(var a in query)
        {
            emailList.Add(new FAREmailList
            {
                ContactName = a.ContactName,
                EmailAddress = a.ContactEmail
            });
        }

        SendEmailFromFAR(emailList);
    }

    if(far.DistrictID == 0)
    {
        emailList = new List<FAREmailList>();
        var query = from dcx in HWC.DistrictContactXREFs
                    join d in HWC.Districts on dcx.DistrictID equals d.DistrictID into d_join
                    from d in d_join.DefaultIfEmpty()
                    join sp in HWC.StateProvinces on new { StateProvinceID = d.StateID } equals new { StateProvinceID = sp.StateProvinceID }
                    where
                      d.StateID == far.StateCountyID
                    select new
                    {
                        dcx.ContactID,
                        dcx.Contact.ContactEmail,
                        dcx.Contact.ContactName
                    };

        foreach (var a in query)
        {
            emailList.Add(new FAREmailList
            {
                ContactName = a.ContactName,
                EmailAddress = a.ContactEmail
            });
        }
        SendEmailFromFAR(emailList);
    }
}

这是接收 emailList 的方法

public void SendEmailFromFAR(FAREmailList el)
{

}

数据类是

public class FAREmailList
{
    public string ContactName { get; set; }
    public string EmailAddress { get; set; }
}

错误被抛出

SendEmailFromFAR(emailList);

我没有看到问题是什么，是因为这些都在同一个类文件中吗？

Answer 1

这个错误对我来说很有意义。 emailList 是 List<FAREmailList> 类型，SendEmailFromFAR 接受 FAREmailList 作为输入。