C#dictionary根据索引值获取Key值

根据dictionary索引获取Key和Value值

var key = dictionary.ElementAt("索引值").Key;
var value= dic.ElementAt("索引值").Value;

获取一个序列的随机开始时间，并设置对应的结束时间

Dictionary<string, string> dic = new Dictionary<string, string>();
dic.Add("06:00", "07:30");
dic.Add("08:00", "11:30");
dic.Add("12:00", "14:00");
dic.Add("14:30", "17:00");
dic.Add("16:00", "21:00");
dic.Add("17:00", "21:00");
dic.Add("19:00", "21:00");

/// 

/// 获取开始和结束时间
/// 
private void GetTime(out DateTime dtStart, out DateTime dtEnd)
{
    var strKey= dic.ElementAt(ran.Next(dic.Count())).Key;
    var strValue = dic[strKey];
    dtStart = DateTime.Parse(strKey);
    dtEnd = DateTime.Parse(strValue);
}