泛型绑定的一个问题

绑定的语句是：

List<TUnitObject> units = TUnitFacade.GetData();
cBUnit.DataSource = units;
cBUnit.DisplayMember = "Unit_Name";
cBUnit.ValueMember = "Unit_Id";

当TUnitObject是这样的时候发现是绑定不上去的

public struct TUnitObject
    {
        public string Unit_Id;
        public string Unit_Name;
        public TUnitObject(string unit_Id, string unit_Name)
        {
            Unit_Id = unit_Id;
            Unit_Name= unit_Name;
        }
    }

后来修改了一下，就可以了：

public struct TUnitObject
    {
        private String fId;
        private String fName;
       
        public string Unit_Id
        {
            get { return fId; }
        }
        public string Unit_Name
        {
            get { return fName; }
        }

        public TUnitObject(string unit_Id, string unit_Name)
        {
            fId = unit_Id;
            fName = unit_Name;
        }
    }

结论是“绑定DataSource只能用属性，貌似”