Question

为了学习最佳实践，我有一个问题。在找到周日开始的方法时，我遇到了这个帖子。 “http://stackoverflow.com/questions/38039/how-can-i-get-the-datetime-for-the-start-of-the-week”

问题：我需要4-3-2011的格式：有没有更有效的方法来实现这一点，而不是我的代码黑客攻击？

DateTime dt = DateTime.Now.StartOfWeek(DayOfWeek.Sunday);
            int ddt = dt.Day;
            int mdt = dt.Month;
            int ydt = dt.Year;
            string sddt = ddt.ToString();
            string smdt = mdt.ToString();
            string sydt = ydt.ToString();
            string fdate = (smdt + "-" + sddt + "-" + sydt);

线程代码：作者Sarcastic

public static class DateTimeExtensions
    {
        public static DateTime StartOfWeek(this DateTime dt, DayOfWeek startOfWeek)
        {
            int diff = dt.DayOfWeek - startOfWeek;
            if (diff < 0)
            {
                diff += 7;
            }

            return dt.AddDays(-1 * diff).Date;
        }
DateTime dt = DateTime.Now.StartOfWeek(DayOfWeek.Sunday);

Answer 1

fdate = DateTime.Now.StartOfWeek(DayOfWeek.Sunday).ToString("M-d-yyyy");

在此处查看：Standard Date and Time Format Strings，DateTimeFormatInfo，用于格式化信息。

Answer 2

更好？不确定。

对我来说第二个代码更好，那么你肯定可以使用

dt.ToString("d-m-yyyy");

Answer 3

稍微好一点的扩展方法，将当前的文化考虑在内(from the same thread above)：

public static class DateTimeExtensions {
    public static DateTime StartOfWeek(this DateTime date) {
        System.Globalization.CultureInfo culture = System.Threading.Thread.CurrentThread.CurrentCulture;
        DayOfWeek dayOfWeek = culture.DateTimeFormat.FirstDayOfWeek;
        return date.AddDays(dayOfWeek - date.DayOfWeek);
    }
}

然后使用：

DateTime.Now.StartOfWeek().ToString("M-d-yyyy");

有没有更好的方法来解构约会？

3 个答案: