工程師的雜記

 

  public partial class CustomerData
    {
        public int CustomerId { get; set; }
        public string Cellphone { get; set; }
    }

========================上面是MVC 架構中的使用

Data=LIST<CustomerData>();

var Customerdata = (from a in Data group a by a.CustomerId into g where g.Count() > 1 select g.Key).ToList();