简化的通用分页代码封装

/// <summary>
/// 数据库分页操作辅助类
/// </summary>
public sealed class PaginationHelper<Entity>
{
/// <summary>
/// 实例化
/// </summary>
/// <returns></returns>
public static PaginationHelper<Entity> Instance()
{
return new PaginationHelper<Entity>();
}

/// <summary>
/// 取当前页，使用存储过程p_CommonPagination
/// </summary>
/// <param name="Table"></param>
/// <param name="Fields"></param>
/// <param name="Where"></param>
/// <param name="Order"></param>
/// <param name="PageIndex"></param>
/// <param name="PageSize"></param>
/// <param name="UseDistinct"></param>
/// <param name="Action">0表示返回查询结果和总数，1表示只返回查询结果，2表示只返回总数</param>
/// <param name="TotalCount"></param>
/// <returns>List>Entity<</returns>
public List<Entity> GetCurrentPage4List(string Table, string Fields, string Where, string Order,
int PageIndex, int PageSize, bool UseDistinct, int Action, out int TotalCount)
{
List<Entity> list = new List<Entity>();

Database db = DatabaseFactory.CreateDatabase();
DbCommand cmd = db.GetStoredProcCommand("p_CommonPagination");

db.AddInParameter(cmd, "@Fields", DbType.String, Fields);
db.AddInParameter(cmd, "@Table", DbType.String, Table);
db.AddInParameter(cmd, "@Where", DbType.String, Where);
db.AddInParameter(cmd, "@Order", DbType.String, Order);
db.AddInParameter(cmd, "@PageIndex", DbType.Int32, PageIndex);
db.AddInParameter(cmd, "@PageSize", DbType.Int32, PageSize);
db.AddInParameter(cmd, "@UseDistinct", DbType.Boolean, UseDistinct);
db.AddInParameter(cmd, "@Action", DbType.Int32, Action);
db.AddOutParameter(cmd, "@TotalCount", DbType.Int32, 4);

using (IDataReader dr = db.ExecuteReader(cmd))
{
while (dr.Read())
{
Entity entity = EntityBuilder<Entity>.CreateBuilder(dr).Build(dr);
list.Add(entity);
}
}

object result = db.GetParameterValue(cmd, "@TotalCount");
if (result == null)
TotalCount = 0;
else
int.TryParse(result.ToString(), out TotalCount);

return list;
}
}

/// <summary>
/// 获取当页User
/// </summary>
/// <param name="where"></param>
/// <param name="orderBy"></param>
/// <param name="pageIndex"></param>
/// <param name="pageSize"></param>
/// <param name="total"></param>
/// <returns>List>User<</returns>
public static List<User> GetPagedUser(string where, string orderBy, int pageIndex, int pageSize, out int total)
{
return PaginationHelper<User>.Instance()
.GetCurrentPage4List("[dbo].[Ts_User]", "*", where, orderBy, pageIndex, pageSize, false, 0, out total);
}