C# 客户端服务引用无法正常工作

我正试图与我的客户解决这个问题 我收到错误：无法将类型“DentistServiceReference.Dentist[]”隐式转换为“DentistServiceReference.DentistServiceClient[]”

代码如下：

private List<DentistServiceReference.DentistServiceClient> DentistDetail()
{
    DentistServiceReference.DentistServiceClient client = new 
    DentistServiceReference.DentistServiceClient();

    DentistServiceReference.DentistServiceClient[] dentists = client.DentistDetail();  <== error

    return dentists.ToList();

private List DentistDetail（）
{
DentistServiceReference.DentistServiceClient客户端=新建
DentistServiceReference.DentistServiceClient（）；
DentistServiceReference.DentistServiceClient[]dentists=client.DentistDetail（）；您是否尝试过
ToArray（）
（注意括号）？
client.DentistDetail（）的返回类型是什么？不要使用
ArrayList
-它是在泛型之前创建的，作为向集合添加对象的“简单”方法。client.DentistDetail（）.ToArray（）相同的错误错误3无法将类型“DentistServiceReference.Dentist[]”隐式转换为“DentistServiceReference.DentistServiceClient[]”@D Stanley当我转到DentistService1.xsd时，我会认为这是一种数组类型。
 public class DentistService : IDentistService
 {
 /*   public List<Dentist>  DentistDetail()    */    use to be like this before the change
    public List<DentistServiceReference.Dentist> DentistDetail()
    {
        using (DentistDataContext db = new DentistDataContext())
        {
            return (from dentist in db.Dentists

                select new  Dentist()    
                {
                    Id = dentist.Id,
                    Dentist_name = dentist.Dentist_name
                }).ToList();     <=== error after the change
    }
}