C# 用Linq实现DataTable实现重复数据过滤

DataTable dt = this.JsonToDataTable("[{\"Code\":\"SortId\",\"Name\":\"SortId\"},{\"Code\":\"SortCode\",\"Name\":\"编号\"},
{\"Code\":\"SolutionName\",\"Name\":\"名称\"},{\"Code\":\"SortId\",\"Name\":\"SortId\"},{\"Code\":\"SortId\",\"Name\":\"SortId\"},
{\"Code\":\"SortId001\",\"Name\":\"SortId\"}]");
            DataTable dtSort = dt.Clone();
            var query = from t in dt.AsEnumerable()
                        group t by new { t1 = t.Field<string>("Code"),t2 = t.Field<string>("Name") } into m
                        select new
                        {
                            code = m.Key.t1,
                            name=m.Key.t2,
                            rowcount = m.Count()
                        };
            if (query.ToList().Count > 0)
            {
                query.ToList().ForEach(q =>
                {
                    DataRow dr = dtSort.NewRow();
                    dr["Code"] = q.code;
                    dr["Name"] = q.name;
                    dtSort.Rows.Add(dr);  
                });
            }