C# 使用ObservableCollection填充listview时出现问题

当我按下按钮时，listview不填充。有人能帮我吗？
公共可见收集支票

    public ObservableCollection<CheckInData> CheckInCollection
    {
        get { return _CheckInCollection; }
    }

    public class CheckInData
    {
        public string RoomNumber { get; set; }
        public decimal Price { get; set; }
        public string Currecny { get; set; }
        public decimal Discount { get; set; }
        public string CheckOut { get; set; }
        public int TotalDay { get; set; }
        public decimal TotalPrice { get; set; }
        public int CheckOutYear { get; set; }
        public int CheckOutMonth { get; set; }
        public int CheckOutDay { get; set; }
        public Boolean IncToday { get; set; }
    }
    private void btnAdd_Click(object sender, RoutedEventArgs e)
    {
        string _CheckOut = "" + datePicker1.SelectedDate.Value.Day.ToString() + "/" + datePicker1.SelectedDate.Value.Month.ToString() + "/" + datePicker1.SelectedDate.Value.Year.ToString() + "";
        int _TotalDays;
        decimal _TotalPrice;
        Boolean _IncToday;

        if (cbIncToday.IsChecked == true)
        {
            _IncToday = true;
            var checkIn = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
            var checkOut = new DateTime(datePicker1.SelectedDate.Value.Year, datePicker1.SelectedDate.Value.Month, datePicker1.SelectedDate.Value.Day + 1);

            TimeSpan ts = checkOut - checkIn;
            _TotalDays = Convert.ToInt32(ts.Days);
            _TotalPrice = _TotalDays * Convert.ToDecimal(txtPrice.Text);
        }
        else
        {
            _IncToday = false;
            var checkIn = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day);
            var checkOut = new DateTime(datePicker1.SelectedDate.Value.Year, datePicker1.SelectedDate.Value.Month, datePicker1.SelectedDate.Value.Day);

            TimeSpan ts = checkOut - checkIn;
            _TotalDays = Convert.ToInt32(ts.Days);
            _TotalPrice = _TotalDays * Convert.ToDecimal(txtPrice.Text);
        }

        _CheckInCollection.Add(new CheckInData
        {
            RoomNumber = cbRooms.Text,
            Price = Convert.ToDecimal(txtPrice.Text),
            Currecny = cbCurreny.Text,
            Discount = Convert.ToDecimal(txtDiscount.Text),
            CheckOut = _CheckOut,
            CheckOutYear = datePicker1.SelectedDate.Value.Year,
            CheckOutMonth = datePicker1.SelectedDate.Value.Month,
            CheckOutDay = datePicker1.SelectedDate.Value.Day,
            IncToday = _IncToday,
            TotalDay = _TotalDays,
            TotalPrice = _TotalPrice

        });
    }

public observeablecollection CheckInCollection
{
获取{return\u CheckInCollection；}
}
公共类CheckInData
{
公共字符串RoomNumber{get；set；}
公共十进制价格{get；set；}
公共字符串Currecny{get；set；}
公共十进制折扣{get；set；}
公共字符串签出{get；set；}
公共整数全天{get；set；}
公共十进制总价{get；set；}
公共int签出年份{get；set；}
public int CheckOutMonth{get；set；}
公共int签出日{get；set；}
公共布尔值{get；set；}
}
私有无效btnAdd_单击（对象发送者，路由目标e）
{
字符串_CheckOut=”“+datePicker1.SelectedDate.Value.Day.ToString（）+“/”+datePicker1.SelectedDate.Value.Month.ToString（）+“/”+datePicker1.SelectedDate.Value.Year.ToString（）+”；
整数天；
十进位(总价格);；
布尔!；
if（cbIncToday.IsChecked==true）
{
_IncToday=正确；
var checkIn=new DateTime（DateTime.Now.Year、DateTime.Now.Month、DateTime.Now.Day）；
var checkOut=新日期时间（datePicker1.SelectedDate.Value.Year、datePicker1.SelectedDate.Value.Month、datePicker1.SelectedDate.Value.Day+1）；
TimeSpan ts=签出-签入；
_TotalDays=转换为32（ts.Days）；
_TotalPrice=_TotalDays*Convert.ToDecimal（txtPrice.Text）；
}
其他的
{
_IncToday=假；
var checkIn=new DateTime（DateTime.Now.Year、DateTime.Now.Month、DateTime.Now.Day）；
var checkOut=新日期时间（datePicker1.SelectedDate.Value.Year、datePicker1.SelectedDate.Value.Month、datePicker1.SelectedDate.Value.Day）；
TimeSpan ts=签出-签入；
_TotalDays=转换为32（ts.Days）；
_TotalPrice=_TotalDays*Convert.ToDecimal（txtPrice.Text）；
}
_CheckInCollection.Add（新的CheckInData
{
RoomNumber=cbRooms.Text，
Price=Convert.ToDecimal（txtPrice.Text），
Currecny=cbCurreny.Text，
折扣=Convert.ToDecimal（txtdepriff.Text），
结帐=\u结帐，
CheckOutYear=datePicker1.SelectedDate.Value.Year，
CheckOutMonth=datePicker1.SelectedDate.Value.Month，
CheckOutDay=datePicker1.SelectedDate.Value.Day，
IncToday=\u IncToday，
TotalDay=\u TotalDays，
总价=_总价
});
}

XAML：

Title=“CheckIn”Height=“473”Width=“682”WindowStartupLocation=“CenterScreen”ResizeMode=“NoResize”DataContext=“{Binding RelativeSource={RelativeSource Self}”>

试试这个

<ListView Margin="8,8,5,1.04" ItemsSource="{Binding Path=CheckInCollection UpdateSourceTrigger = PropertyChanged}">

---

在ListView元素上，应该将ItemsSource属性绑定到集合，而不是DisplayMemberPath

<ListView Margin="8,8,5,1.04" ItemsSource="{Binding Path=CheckInCollection UpdateSourceTrigger = PropertyChanged}">