DataSet转化为实体集合类

/// <summary>
        /// DataSet转换为实体类
        /// </summary>
        /// <typeparam name="T">实体类</typeparam>
        /// <param name="p_DataSet">DataSet</param>
        /// <param name="p_TableIndex">待转换数据表索引</param>
        /// <returns>实体类</returns>
        public static T DataSetToEntity<T>(DataSet p_DataSet, int p_TableIndex)
        {
            if (p_DataSet == null || p_DataSet.Tables.Count < 0)
                return default(T);
            if (p_TableIndex > p_DataSet.Tables.Count - 1)
                return default(T);
            if (p_TableIndex < 0)
                p_TableIndex = 0;
            if (p_DataSet.Tables[p_TableIndex].Rows.Count <= 0)
                return default(T);

            DataRow p_Data = p_DataSet.Tables[p_TableIndex].Rows[0];
            // 返回值初始化
            T _t = (T)Activator.CreateInstance(typeof(T));
            PropertyInfo[] propertys = _t.GetType().GetProperties();
            foreach (PropertyInfo pi in propertys)
            {
                if (p_DataSet.Tables[p_TableIndex].Columns.IndexOf(pi.Name.ToUpper()) != -1 && p_Data[pi.Name.ToUpper()] != DBNull.Value)
                {
                    pi.SetValue(_t, p_Data[pi.Name.ToUpper()], null);
                }
                else
                {
                    pi.SetValue(_t, null, null);
                }
            }
            return _t;
        }

        /// <summary>
        /// DataSet转换为实体列表
        /// </summary>
        /// <typeparam name="T">实体类</typeparam>
        /// <param name="p_DataSet">DataSet</param>
        /// <param name="p_TableIndex">待转换数据表索引</param>
        /// <returns>实体类列表</returns>
        public static IList<T> DataSetToEntityList<T>(DataSet p_DataSet, int p_TableIndex)
        {
            if (p_DataSet == null || p_DataSet.Tables.Count < 0)
                return default(IList<T>);
            if (p_TableIndex > p_DataSet.Tables.Count - 1)
                return default(IList<T>);
            if (p_TableIndex < 0)
                p_TableIndex = 0;
            if (p_DataSet.Tables[p_TableIndex].Rows.Count <= 0)
                return default(IList<T>);

            DataTable p_Data = p_DataSet.Tables[p_TableIndex];
            // 返回值初始化
            IList<T> result = new List<T>();
            for (int j = 0; j < p_Data.Rows.Count; j++)
            {
                T _t = (T)Activator.CreateInstance(typeof(T));
                PropertyInfo[] propertys = _t.GetType().GetProperties();
                foreach (PropertyInfo pi in propertys)
                {
                    if (p_Data.Columns.IndexOf(pi.Name.ToUpper()) != -1 && p_Data.Rows[j][pi.Name.ToUpper()] != DBNull.Value)
                    {
                        pi.SetValue(_t, p_Data.Rows[j][pi.Name.ToUpper()], null);
                    }
                    else
                    {
                        pi.SetValue(_t, null, null);
                    }
                }
                result.Add(_t);
            }
            return result;
        }