C# 无法初始化类型'；PeopleModel'；使用集合初始值设定项，因为它不实现'；System.Collections.IEnumerable'；

我有一个方法，目的是从OleDB填充PersonModel

public IEnumerable<PeopleModel> GetPeopleDetails()
{
    var constr = ConfigurationManager.ConnectionStrings["dbfString"].ConnectionString;
    using (var dbfCon = new OleDbConnection(constr))
    {
        dbfCon.Open();
        using (var dbfCmd = dbfCon.CreateCommand())
        {
            dbfCmd.CommandText = "SELECT pp_firstname, pp_surname, pp_title, pp_compnm, pp_hmaddr1, pp_hmaddr2, pp_hmtown, pp_hmcounty, pp_hmpcode, pp_spouse, pp_children FROM people ORDERBY pp_surname";
            using (var myReader = dbfCmd.ExecuteReader())
            {
                var peopleList = new List<PeopleModel>();
                while (myReader.Read())
                {
                    var details = new PeopleModel
                    {
                        details.Firstname = myReader[0].ToString(),
                        details.Lastname = myReader[1].ToString(),
                        details.Title = myReader[2].ToString(),
                        details.Company = myReader[3].ToString(),
                        details.Addr1 = myReader[4].ToString(),
                        details.Addr2 = myReader[5].ToString(),
                        details.Town = myReader[6].ToString(),
                        details.County = myReader[7].ToString(),
                        details.Spouse = myReader[8].ToString(),
                        details.Children = myReader[9].ToString(),                            
                    };
                    peopleList.Add(details);
                }
                return peopleList;
            }
        }
    }
} 

虽然companys方法以前工作得很好，但在实现人员代码后尝试构建项目时，我现在遇到以下错误：无法使用集合初始值设定项初始化类型“PeopleModel”，因为它没有实现“System.Collections.IEnumerable”

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我真的对此束手无策，因为它对一家公司的工作方式几乎相同。

语法正确，没有

细节。

在初始值设定项中的赋值中：

var details = new PeopleModel
{
    Firstname = myReader[0].ToString(),
    Lastname = myReader[1].ToString(),
    Title = myReader[2].ToString(),
    Company = myReader[3].ToString(),
    Addr1 = myReader[4].ToString(),
    Addr2 = myReader[5].ToString(),
    Town = myReader[6].ToString(),
    County = myReader[7].ToString(),
    Spouse = myReader[8].ToString(),
    Children = myReader[9].ToString(),                            
};

var details = new PeopleModel
{
    Firstname = myReader[0].ToString(),
    Lastname = myReader[1].ToString(),
    Title = myReader[2].ToString(),
    Company = myReader[3].ToString(),
    Addr1 = myReader[4].ToString(),
    Addr2 = myReader[5].ToString(),
    Town = myReader[6].ToString(),
    County = myReader[7].ToString(),
    Spouse = myReader[8].ToString(),
    Children = myReader[9].ToString(),                            
};