问题描述
有谁将为时间跨度对象转换为友好的字符串，如知道一个很好的库（或代码片段）的：
Does anyone know of a good library (or code snippet) for converting a TimeSpan object to a "friendly" string such as:
- 两年三个月四天
- 一周两天
（这是为一个文件有效期制度，在期满可以从几天什么几十年）
(It's for a document expiry system, where the expiry could be anything from a few days to several decades)
只是为了澄清，说我有一个时间跨度为7天，即应打印1周，14天2周，366天1年和1天，等等等等。
Just to clarify, say I had a TimeSpan with 7 days, that should print "1 week", 14 days "2 weeks", 366 days "1 year and 1 day", etc etc.
推荐答案
不是一个完整的实现，但它应该让你足够接近
Not a fully featured implementation, but it should get you close enough.
DateTime dtNow = DateTime.Now;
DateTime dtYesterday = DateTime.Now.AddDays(-435.0);
TimeSpan ts = dtNow.Subtract(dtYesterday);
int years = ts.Days / 365; //no leap year accounting
int months = (ts.Days % 365) / 30; //naive guess at month size
int weeks = ((ts.Days % 365) % 30) / 7;
int days = (((ts.Days % 365) % 30) % 7);
StringBuilder sb = new StringBuilder();
if(years > 0)
{
sb.Append(years.ToString() + " years, ");
}
if(months > 0)
{
sb.Append(months.ToString() + " months, ");
}
if(weeks > 0)
{
sb.Append(weeks.ToString() + " weeks, ");
}
if(days > 0)
{
sb.Append(days.ToString() + " days.");
}
string FormattedTimeSpan = sb.ToString();
在最后，你真的需要让别人知道一个文件即将过期准确1年5个月，2周，3天从现在开始？你能不能跟告诉他们该文件会从现在起1年以上到期从现在起，或通过5个月度日？只取最大的单位，说在该单位的n个。
In the end, do you really need to let someone know a document is going to expire exactly 1 year, 5 months, 2 weeks, and 3 days from now? Can't you get by with telling them the document will expire over 1 year from now, or over 5 months from now? Just take the largest unit and say over n of that unit.
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