public static List<T> PutAllVal<T>(T entity, DataSet ds) where T : new() {  List<T> lists = new List<T>();  if (ds.Tables[0].Rows.Count > 0) {    foreach (DataRow row in ds.Tables[0].Rows) {      lists.Add(PutVal(new T(),row));    }  }  return lists;}public static T PutVal<T>(T entity, DataRow row) where T : new() {  //初始化 如果為null  if (entity == null){    entity = new T();  }  //得到類型  Type type = typeof(T);  //取得屬性集合  PropertyInfo[] pi = type.GetProperties();  foreach (PropertyInfo item in pi){    //給屬性賦值    if (row[item.Name] != null && row[item.Name] != DBNull.Value) {      if (item.PropertyType == typeof(System.Nullable<System.DateTime>)) {        item.SetValue(entity, Convert.ToDateTime(row[item.Name].ToString()), null);      } else {        item.SetValue(entity, Convert.ChangeType(row[item.Name], item.PropertyType), null);      }    }  }  return entity;}