83 lines
2.7 KiB
C#
83 lines
2.7 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Web;
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namespace HZQR.Common
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{
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public class Pub
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{
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#region 方法 -> 获取get,post传参的值
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/// <summary>
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/// 获取get,post传参的值
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/// </summary>
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/// <param name="key">参数名</param>
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/// <param name="defaultValue">参数为空时的默认值</param>
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/// <returns></returns>
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public static string Request(string key, string defaultValue = null)
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{
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var v = HttpContext.Current.Request.Form[key];
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if (v == null)
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{
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v = HttpContext.Current.Request.QueryString[key];
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}
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return v ?? (defaultValue ?? string.Empty);
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}
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#endregion
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#region 方法 -> 获取上个月第一天和最后一天
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//获取上个月第一天
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public static DateTime FirstDayOfPreviousMonth(DateTime datetime)
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{
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return datetime.AddDays(1 - datetime.Day).AddMonths(-1);
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}
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//获取上个月的最后一天
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public static DateTime LastDayOfPrdviousMonth(DateTime datetime)
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{
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return datetime.AddDays(1 - datetime.Day).AddDays(-1);
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}
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#endregion
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#region 方法 -> 计算距离
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/// <summary>
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/// 计算两点位置的距离，返回两点的距离，单位：公里或千米
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/// 该公式为GOOGLE提供，误差小于0.2米
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/// </summary>
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/// <param name="lat1">第一点纬度</param>
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/// <param name="lng1">第一点经度</param>
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/// <param name="lat2">第二点纬度</param>
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/// <param name="lng2">第二点经度</param>
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/// <returns>返回两点的距离，单位：公里或千米</returns>
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public static double GetDistance(double lat1, double lng1, double lat2, double lng2)
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{
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//地球半径，单位米
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double EARTH_RADIUS = 6378137;
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double radLat1 = Rad(lat1);
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double radLng1 = Rad(lng1);
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double radLat2 = Rad(lat2);
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double radLng2 = Rad(lng2);
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double a = radLat1 - radLat2;
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double b = radLng1 - radLng2;
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double result = 2 * Math.Asin(Math.Sqrt(Math.Pow(Math.Sin(a / 2), 2) +
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Math.Cos(radLat1) * Math.Cos(radLat2) * Math.Pow(Math.Sin(b / 2), 2))) * EARTH_RADIUS;
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return result / 1000;
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}
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/// <summary>
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/// 经纬度转化成弧度
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/// </summary>
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/// <param name="d"></param>
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/// <returns></returns>
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private static double Rad(double d)
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{
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return (double)d * Math.PI / 180d;
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}
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#endregion
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}
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}
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