c# List获取重复项

 List<Test> t = new List<Test>() {
                 new Test(){id=,name="车辆"},
                 new Test(){id=,name="车辆"},
                 new Test(){id=,name="飞机"},
                 new Test(){id=,name="火车"},
                 new Test(){id=,name="火车"},
             };
          //同名
             var q = t.GroupBy(x => x.name).Where(x => x.Count() > ).ToList();

             foreach (var item in q)
             {
                 Console.WriteLine(item.Key);
             }

sql:

 --重复的物品编码
 SELECT COUNT(0) AS num,Code
 FROM dbo.Goods
 GROUP BY Code
 HAVING COUNT(0)>1
 ORDER BY Code