C# 在Xamarin.Forms Daily Count中显示条形图

我正在与Xamarin.Forms合作，我正在使用Microcharts创建条形图

我正试图制作一个条形图，显示本周从周一到周日每天输入的图书数量

但是，当用户在星期日查看页面时，条形图仅显示星期日的计数，因为它显示的是周一至周六的下一周天数

相反，条形图应显示本周周一至周日的数据

var days = Enum.GetValues(typeof(DayOfWeek)).OfType<DayOfWeek>().OrderBy(day => day < DayOfWeek.Monday);
var dailyBookCounts =  new Dictionary<string, int>();
foreach (var day in days)
{
    var specificDayAtMidnight = DateTime.Today.AddDays(-(int)DateTime.Today.DayOfWeek + (int)day);
    var bookCount = App.Database.GetDailyCount(specificDayAtMidnight);
    dailyBookCounts.Add(day.ToString("G"), bookCount);
}

var entries = new List<ChartEntry>();
foreach (var (nameOfTheDay, bookCountOfTheDay) in dailyBookCounts)
{
    entries.Add(new ChartEntry(bookCountOfTheDay)
    {
        Label = nameOfTheDay,
        ValueLabel = bookCountOfTheDay.ToString(),
        Color = SKColor.Parse("#004daa")
    });
}

chartView.Chart = new BarChart
{
    Entries = entries, 
    LabelTextSize = 32f, 
    LabelOrientation = Orientation.Horizontal, 
    ValueLabelOrientation = Orientation.Horizontal, 
    Margin = 20
};

Database.cs：

public int GetDailyCount(DateTime day)
{
     var dayAfterCurrentDay = day.AddDays(1); 
     return database.ExecuteScalar<int>("SELECT COUNT(*) FROM Book WHERE bookSaveTime> ? AND bookSaveTime< ?;", day, dayAfterCurrentDay);   
}

---

如何更改此设置，使条形图显示本周周一至周日的数据，而不是在周日查看页面时显示接下来几周的数据？

您没有正确计算本周的天数。您可以使用此中的扩展方法来执行此操作

// get the first day of current week, starting Monday at 12:00AM
DateTime dt = DateTime.Now.StartOfWeek(DayOfWeek.Monday);

for (var d = 0; d < 7; d++)
{
  var specificDayAtMidnight = dt.AddDays(d);
  var bookCount = App.Database.GetDailyCount(specificDayAtMidnight);
  dailyBookCounts.Add(specificDayAtMidnight.ToString("G"), bookCount);
}