XdCxRhDW/XdCxRhDW.Repostory/XlCache.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using XdCxRhDW.Repostory.EFContext;
using XdCxRhDW.Repostory.Model;

namespace XdCxRhDW.Repostory
{
    public static class XlCache
    {
        /// <summary>
        /// 获取数据库所有双行根数
        /// </summary>
        /// <param name="maxCount">最大条数.超过此条数时不再继续查询,为0则不限制条数</param>
        /// <returns></returns>
        public static async Task<List<XlInfo>> GetAllAsync()
        {
            try
            {
                using (RHDWContext db = new RHDWContext())
                {
                    var res = await db.XlInfos.OrderByDescending(p => p.TimeBJ).OrderByDescending(p => p.Lon).ToListAsync();
                    return res;
                }
            }
            catch (Exception ex)
            {
                Serilog.Log.Error(ex, "加载星历信息异常");
                return null;
            }
        }


        /// <summary>
        /// 获取某个星某个时刻最近的双行根(可能返回null)
        /// </summary>
        /// <param name="satCode">卫星编号</param>
        /// <param name="timeBj">时刻</param>
        /// <returns></returns>
        public static async Task<XlInfo> GetLatestAsync(int satCode, DateTime timeBj)
        {
            try
            {
                using (RHDWContext db = new RHDWContext())
                {
                    var res= await db.XlInfos.Where(p => p.SatCode == satCode).OrderBy(p => (p.TimeBJ - timeBj).Duration()).FirstOrDefaultAsync();
                    return res;
                }
            }
            catch (Exception ex)
            {
                Serilog.Log.Error(ex, $"获取卫星[{satCode}]--{timeBj:yyyyMMddHHmmss}时刻附近的双行根数出错!");
                return null;
            }
        }
    }
}