lyfz_repos/其他源码/LYFZ.WinAPI/LinQExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace LYFZ
{
    public static class LinQExtensions
    {
        public static string ToYYYY_MM_dd_HH_mm_ss(this DateTime dtime)
        {
            return dtime.ToString("yyyy-MM-dd HH:mm:ss");
        }
        public static string ToYYYY_MM_dd(this DateTime dtime)
        {
            return dtime.ToString("yyyy-MM-dd");
        }
        public static string ToHH_mm_ss(this DateTime dtime)
        {
            return dtime.ToString("HH:mm:ss");
        }
        /// <summary>
        /// 转对象为字符串 如果对象为null 返加 空字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToString_s(this object obj)
        {
            if (obj != null)
            {
                return obj.ToString();
            }
            else {
                return "";
            }
        }
        /// <summary>
        /// 转为小写字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToLowerString(this object obj)
        {
            return obj.ToString().ToLower();
        }
        /// <summary>
        /// 转为去除前后空格的小写字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToTrimLowerString(this object obj)
        {
            return obj.ToString().ToLower().Trim();
        }
        /// <summary>
        /// 转为大写字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToUpperString(this object obj)
        {
            return obj.ToString().ToUpper();
        }
        /// <summary>
        /// 转为去除前后空格的大写字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToTrimUpperString(this object obj)
        {
            return obj.ToString().ToUpper().Trim();
        }

        /// <summary>
        ///  通过使用默认的相等比较器对值进行比较返回序列中的非重复元素。
        /// </summary>
        /// <typeparam name="TSource"></typeparam>
        /// <typeparam name="TKey"></typeparam>
        /// <param name="source"></param>
        /// <param name="keySelector"></param>
        /// <returns></returns>
        public static IEnumerable<TSource> DistinctBy<TSource, TKey>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector)
        {
            HashSet<TKey> seenKeys = new HashSet<TKey>();
            foreach (TSource element in source)
            {
                if (seenKeys.Add(keySelector(element)))
                {
                    yield return element;
                }
            }
        }
        /// <summary>
        /// 转 布尔值为 int 
        /// </summary>
        /// <param name="bl"></param>
        /// <returns></returns>
        public static int BoolToInt(this bool bl)
        {
            return bl ? 1 : 0;
        }
        /// <summary>
        /// 转 int 为 布尔值
        /// </summary>
        /// <param name="i"></param>
        /// <returns></returns>
        public static bool IntToBool(this int i)
        {
            return i > 0;
        }
        /// <summary>
        /// DateTime转换为JavaScript时间戳  13位数长度
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static long ToJavaScriptTimeStamp(this DateTime t)
        {
            return LYFZ.WinAPI.TimeStampConversion.DateTimeToJavaScriptTimeStamp(t);
        }
        /// <summary>
        /// JavaScript时间戳转换为DateTime
        /// </summary>
        /// <param name="timeStamp">为有效的时间戳整数</param>
        /// <returns></returns>
        public static DateTime JavaScriptTimeStampToDateTime(this long timeStamp)
        {
            try
            {
                return LYFZ.WinAPI.TimeStampConversion.JavaScriptTimeStampToDateTime(timeStamp);
            }
            catch (Exception ex)
            {
                throw new Exception("时间戳转换时出错,时间戳无效：" + ex.Message);
            }
        }

        /// <summary>
        /// 序列化object到byte[]
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static byte[] ToSerializerRetBytes(this object o)
        {
            if (o != null)
            {
                return LYFZ.WinAPI.DataSetSerializerDeserialize.ObjectSerializerRetBytes(o);
            }
            else
            {
                return null;
            }
        }
    }
}