DataTable建立行和列

          DataTable dt = new DataTable();
            dt.Columns.Add("ID",typeof(string));
            dt.Columns.Add("SpecID", typeof(string));
            dt.Columns.Add("SpecValue", typeof(string));
            dt.Columns.Add("SectionID", typeof(string));
            foreach(ProductReferenceSpecValue value in list){
                DataRow dr = dt.NewRow();
                dr["ID"] = value.ID;
                dr["SpecID"] = value.SpecID;
                dr["SpecValue"] = string.IsNullOrEmpty(value.SpecValue) ? null : value.SpecValue;
                dr["SectionID"] = string.IsNullOrEmpty(value.SectionID) ? null : value.SectionID;
                dt.Rows.Add(dr);
            }