C#日期时间选择器清除特定项目
本文关键字：项目 清除 选择器 日期 时间 | 更新日期: 2023-09-27 18:22:41
我有一个Java应用程序正在尝试转换为C#。我已经解决了相当多的程序，但我有一个明确的方法困扰着我：
private void checkCourts()
{
if (splMonth.getSelectedValue() != null && splDate.getSelectedValue() != null)
{
courtModel.clear();
Calendar booking = new GregorianCalendar();
int year = Calendar.getInstance().get(Calendar.YEAR);
int month = new Scanner(splMonth.getSelectedValue().toString()).nextInt() - 1;
int date = new Scanner(splDate.getSelectedValue().toString()).nextInt();
int time = Integer.parseInt(cmbxTime.getSelectedItem().toString());
int currentMonth = Calendar.getInstance().get(Calendar.MONTH);
int currentDate = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
int currentTime = Calendar.getInstance().get(Calendar.HOUR_OF_DAY);
booking.set(year, month, date, time, 0, 0);
if (month > currentMonth || (month == currentMonth && date > currentDate) || (month == currentMonth && date == currentDate && time > currentTime))
{
try
{
ArrayList<Reservation> rs = BookingManager.getInstance().getReservations();
Reservation r = new Reservation(booking);
ArrayList<String> courtNames = BookingManager.getInstance().getCourtsName();
for (int i = 0; i < rs.size(); i++)
{
r.getReservationTime().clear(Calendar.MILLISECOND);
rs.get(i).getReservationTime().clear(Calendar.MILLISECOND);
}
if (!rs.contains(r))
{
for (String c : courtNames)
{
courtModel.addElement(c);
}
}
else
{
for (String c : courtNames)
{
courtModel.addElement(c);
}
for (int i = 0; i < rs.size(); i++)
{
if (r.getReservationTime().getTime().equals(rs.get(i).getReservationTime().getTime()))
{
String courtName = BookingManager.getInstance().getNameById(rs.get(i).getCourtId());
courtModel.removeElement(courtName);
}
}
}
splCourt.setModel(courtModel);
}
catch (Exception e)
{
System.out.println("ERROR - " + e.getMessage());
}
}
else
{
JOptionPane.showMessageDialog(null, "Den valgte dato er ikke tilgængelig for booking.", "Advarsel", JOptionPane.INFORMATION_MESSAGE);
}
}
}
嗯，我认为循环的顶部才是真正的问题。我想删除已经预订的预订时间。
这是我第一次尝试循环：
private void checkCourts()
{
DateTime current = DateTime.Now;
int year = Int32.Parse(DateTimePicker.Value.ToString("yyyy"));
int currentYear = current.Year;
int month = Int32.Parse(DateTimePicker.Value.ToString("MM"));
int currentMonth = current.Month;
int day = Int32.Parse(DateTimePicker.Value.ToString("dd"));
int currentDay = current.Day;
int time = (int)cmbxTime.SelectedItem;
int currentTime = current.TimeOfDay.Hours;
string date1 = year.ToString() + "," + month.ToString() + "," + day.ToString();
DateTime thisdate = DateTime.Parse(date1);
thisdate = thisdate.AddHours(time);
List<Reservation> rs = BookingManager.getInstance().getReservations();
Reservation r = new Reservation(thisdate);
List<string> courtNames = BookingManager.getInstance().getCourtsName();
if (month > currentMonth || (month == currentMonth && day > currentDay) ||
(month == currentMonth && day == currentDay && time > currentTime) && year >= currentYear)
{
try
{
for (int i = 0; i < rs.Count; i++)
{
r.ReservationTime = r.ReservationTime.AddTicks(-r.ReservationTime.Ticks % 10000000);
rs[i].ReservationTime = rs[i].ReservationTime.AddTicks(-rs[i].ReservationTime.Ticks % 10000000);
}
if (!rs.Contains(r))
{
foreach (string c in courtNames)
{
lboxCourts.Items.Add(c);
}
}
else
{
foreach (string c in courtNames)
{
lboxCourts.Items.Add(c);
}
for (int i = 0; i < rs.Count; i++)
{
if (r.ReservationTime.Equals(rs[i].ReservationTime))
{
String courtName = BookingManager.getInstance().getNameById(rs[i].CourtId);
lboxCourts.Items.Remove(courtName);
MessageBox.Show("is equal");
}
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
else
{
MessageBox.Show("Den valgte dato er ikke gyldig! - vær opmærksom på at hvis du vælger dags dato, at tidspunktet ikke kan være tidligere end nuværende tidspunkt!");
}
}
希望你能帮我澄清一下。。我只是失去了注意力。我知道我在网上看到的情况——日期时间选择器并不是那么容易编辑。但随后我会将已预订的项目编辑为类似"已预订"的内容。
根据文档，Java代码.clear(Calendar.MILLISECOND)只是从值中删除任何毫秒。它不会对您的应用程序逻辑做任何事情来删除实际的预订时间。它似乎也不涉及任何类型的DateTimePicker。
假设在c#中，ReservationTime是DateTime属性，而r.ReservationTime是与rs[i].ReservationTime不同的属性，则需要执行以下操作：
for (int i = 0; i < rs.Count; i++)
{
r.ReservationTime = r.ReservationTime.AddTicks(-r.ReservationTime.Ticks % 10000000);
rs[i].ReservationTime = rs[i].ReservationTime.AddTicks(-rs[i].ReservationTime.Ticks % 10000000);
}
有几点需要注意：
- Java的
Calendar类的分辨率为毫秒，因此删除毫秒等于将值截断为秒 - .Net中的
DateTime具有刻度的分辨率。我的刻度是100纳秒，所以一秒钟有10000000个刻度 - 因此，你不能只清除毫秒，你必须通过计算小于一秒的剩余时间来清除。然后从原始值中减去这些值，得到相同的结果
- .Net中的
DateTime是不可变的，所以不能只更改一个属性。您必须计算一个新值，然后将其分配回原始变量
结果是这样的：
for (int i = 0; i < rs.Count; i++)
{
r.ReservationTime = r.ReservationTime;
rs[i].ReservationTime = DateTime.Parse(rs[i].ReservationTime.ToString());
if (thisdate.CompareTo(rs[i].ReservationTime) != 0)
{
foreach (string c in courtNames)
{
lboxCourts.Items.Add(c);
}
}
else
{
lboxCourts.Items.Clear();
foreach (string c in courtNames)
{
lboxCourts.Items.Add(c);
}
for (int j = 0; j < rs.Count; j++)
{
if (r.ReservationTime.Equals(rs[j].ReservationTime))
{
string courtName = BookingManager.getInstance().getNameById(rs[j].CourtId);
lboxCourts.Items.Remove(courtName);
}
}
}
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
else
{
MessageBox.Show("Den valgte dato er ikke gyldig! - vær opmærksom på at hvis du vælger dags dato, at tidspunktet ikke kan være tidligere end nuværende tidspunkt!");
}
}
谢谢你的帮助。。。现在我的方法是删除已经预订的球场；-）
致以最诚挚的问候Rasmus