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 < )
                 return default(T);
             if (p_TableIndex > p_DataSet.Tables.Count - )
                 return default(T);
             if (p_TableIndex < )
                 p_TableIndex = ;
             if (p_DataSet.Tables[p_TableIndex].Rows.Count <= )
                 return default(T);

             DataRow p_Data = p_DataSet.Tables[p_TableIndex].Rows[];
             // 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()) != - && 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 < )
                 return default(IList<T>);
             if (p_TableIndex > p_DataSet.Tables.Count - )
                 return default(IList<T>);
             if (p_TableIndex < )
                 p_TableIndex = ;
             if (p_DataSet.Tables[p_TableIndex].Rows.Count <= )
                 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 = ; 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()) != - && 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;
         }