Entity framework 无法将LINQ查询的结果强制转换为IEnumerable

无法强制转换类型为的对象 'System.Data.Entity.Infrastructure.DbQuery`1[f_uAnonymousType1`8[System.Int32，System.String，System.String，System.String，System.String，System.String，System.String，System.Nullable`1[System.Boolean]，System.Nullable`1[System.DateTime]] 键入“System.Collections.Generic.IEnumerable`1[ConsultantManagement.CustomBuffers.CUSTOM\u CONSULTANT\u LIST]”

这是我的定制顾问列表课程：

  public class CUSTOM_CONSULTANT_LIST
  {
    public int ID_CONSULTANT { get; set; }
    public string NME_FIRST { get; set; }
    public string NME_LAST { get; set; }
    public string PHN_CELL { get; set; }
    public string NME_PAY_TO { get; set; }
    public string CDE_PAYMENT_METHOD { get; set; }
    public Nullable<bool> IND_ACTIVE { get; set; }
    // Added custom field to contain the MAX Invoice Date for the Consultant...
    public Nullable<System.DateTime> LATEST_INVOICE_DATE { get; set; }
  }

这是函数第一行失败的代码

public static IEnumerable<CUSTOM_CONSULTANT_LIST> Get_Consultant_List(ref ConsultantListViewModel vm)
{
  // Retrieve the list of consultants with the latest (MAX) invoice date joined...
  IEnumerable<CUSTOM_CONSULTANT_LIST> query = (IEnumerable<CUSTOM_CONSULTANT_LIST>)(from c in db.CCC_CONSULTANT
                                               join i in db.CCC_INVOICE on c.ID_CONSULTANT equals i.ID_CONSULTANT
               select new
                         {
                           c.ID_CONSULTANT, c.NME_FIRST, c.NME_LAST, c.PHN_CELL, c.NME_PAY_TO, c.CDE_PAYMENT_METHOD, c.IND_ACTIVE, 
                           LATEST_INVOICE_DATE = c.CCC_CONSULTANT_ACTIVITY.Max((a) => a.DTM_ACTIVITY) });

  return query.ToList();
}

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我做错了什么？

您的查询返回一个匿名类型的枚举，因为错误消息说这是f_uAnonymousType18[System.Int32，…bit；匿名类型在某种意义上确实有名称，但它们由无法形容的Lovecraftian line noise和Chtonic jabberwocky组成：

select new
{
    c.ID_CONSULTANT, c.NME_FIRST, ...

试试这个：

select new CUSTOM_CONSULTANT_LIST
{
    ID_CONSULTANT = c.ID_CONSULTANT, 
    NME_FIRST = c.NME_FIRST, 
    //  ... other properties ...
    LATEST_INVOICE_DATE = c.CCC_CONSULTANT_ACTIVITY.Max((a) => a.DTM_ACTIVITY) 
}

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是的-真实的事实-Cthulu生成anon classesEd的名称，非常感谢！