LINQ返回IList，绑定到ComboBox

                        //构造"自定义通用代码"数据集
                        Infos<MM_TYDMInfo> CustomTYDMInfos = new Infos<MM_TYDMInfo>();
                        MM_TYDMInfo item = new MM_TYDMInfo();
                        item.LBID = (decimal)enumTydmlb;
                        item.DMMC = "无";
                        item.ID = 0;
                        CustomTYDMInfos.DataMember.Add(item);
                        item = new MM_TYDMInfo();
                        item.LBID = (decimal)enumTydmlb;
                        item.DMMC = "一级";
                        item.ID = 1;
                        CustomTYDMInfos.DataMember.Add(item);
                        item = new MM_TYDMInfo();
                        item.LBID = (decimal)enumTydmlb;
                        item.DMMC = "二级";
                        item.ID = 2;
                        CustomTYDMInfos.DataMember.Add(item);
                        item = new MM_TYDMInfo();
                        item.LBID = (decimal)enumTydmlb;
                        item.DMMC = "三级";
                        item.ID = 3;
                        CustomTYDMInfos.DataMember.Add(item);
                        item = new MM_TYDMInfo();
                        item.LBID = (decimal)enumTydmlb;
                        item.DMMC = "四级";
                        item.ID = 4;
                        CustomTYDMInfos.DataMember.Add(item);
                        //用LINQ根据LBID属性从自定义数据集读取数据
                        var query = from tydminfos in CustomTYDMInfos
                                    where tydminfos.LBID == (decimal)enumTydmlb
                                    select tydminfos;
                        //转换成IList<T>
                        IList<MM_TYDMInfo> TYDMList = query.ToList();
                        //绑定数据
                        this.DataSource = TYDMList;
                        //设置默认选择
                        if (TYDMList.Count > 0)
                            this.SelectedIndex = 0;