为什么我的 C# 程序不显示生日提醒？ [关闭]

Question

我已将此代码写入我的主类 (C#) 中用于生日提醒。它以前可以工作，但现在不行了。我根本没有更改代码。可能是什么问题？

/// <summary>
/// Find all members that have birthdays occurring this week
/// </summary>
/// <returns>Returns an ArrayList containing members</returns>
public ArrayList BirthdaysThisWeek()
{
    ArrayList members = new ArrayList();

    DateTime today = DateTime.Today;

    //Work out how many days to add or to take away to get us to Monday
    int delta = DayOfWeek.Monday - today.DayOfWeek;
    //Change the date to point to Monday
    DateTime monday = today.AddDays(delta);
    //Make this date point to Sunday
    DateTime sunday = monday.AddDays(6);

    foreach (Member member in allMembers)
    {
        DateTime dob = member.DateOfBirth.Date;
        //Check to see if a member's birthdate is between Monday and Sunday
        if(dob >= monday.Date && dob <= sunday.Date)
        {
            //Add member to members ArrayList
            members.Add(member);
        }
    }

    //Return all members that have a birthday this week if none were     found return an empty ArrayList
    return members;
}

Answer 1

您的情况不适用，因为您将生日的年份、月份和日期与实际一周的日期进行比较。在 CodeCaster 的评论之后我改变了我的答案，因为 DayOfYear 不适用于闰年 2 月 28 日之后的生日，你可以通过像这样初始化 dobDateTime 来解决这个问题：

int actuelYear = member.DateOfBirth.Month == monday.Month ? monday.Year : sunday.Year;
DateTime dob = new DateTime(actuelYear, member.DateOfBirth.Month, member.DateOfBirth.Day);
if (dob.Date >= monday.Date && dob.Date <= sunday.Date)
{
    members.Add(member);
}

Answer 2

除非他们本周出生，否则我看不出这会如何。

你需要忽略他们出生的年份。

public static bool IsBirthDayInRange(DateTime birthday, DateTime start, DateTime end)
{
    DateTime temp = birthday.AddYears(start.Year - birthday.Year);

    if (temp < start) temp = temp.AddYears(1);

    return birthday <= end && temp >= start && temp <= end;
}

参考：https://stackoverflow.com/a/2554881/495455

所以你需要把你的代码改成这样：

public ArrayList BirthdaysThisWeek()
{
    ArrayList members = new ArrayList();

    DateTime today = DateTime.Today;
    int delta = DayOfWeek.Monday - today.DayOfWeek;
    DateTime monday = today.AddDays(delta);
    DateTime sunday = monday.AddDays(6);

    foreach (Member member in allMembers)
    {
        DateTime dob = member.DateOfBirth.Date;

        //Check to see if a member's birthdate is between Monday and Sunday
        if (IsBirthDayInRange(dob, monday, sunday)
        {
            //Add member to members ArrayList
            members.Add(member);
        }
    }
    return members;
}