如何仅从 WPF 中的日期选择器中获取日期？

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我有一个 DatePicker 供用户手动选择日期，并且该日期作为数据网格中所选项目的值输入。

但是，例如，它显示为“23/01/2023 12:00:00 AM”。
我希望它显示为“23/01/2023”。

我的代码如下：

    public partial class Shortlist : Window
    {
     
//        public ObservableCollection<ShortlistedClient> shlclients { get; set; } = new ObservableCollection<ShortlistedClient>();
        List<ShortlistedClient1> shlclients = new List<ShortlistedClient1>();

        public DateTime? SelectedDateFormat { get; private set; }

        public Shortlist()
        {
            InitializeComponent();
        //    createShClientList();
            DataContext = shlclients;
            shlclients.Add(new ShortlistedClient1("Rich", "07515118265", "rich@gmail.com", "Glasgow", "Office", "MSc", "more than 3 years", "Yes", "No"));
            shlclients.Add(new ShortlistedClient1("Steve", "07515118265", "steve@gmail.com", "Glasgow", "Construction", "High School", "more than 3 years", "Yes", "No"));
            shlclients.Add(new ShortlistedClient1("Maria", "07485999005", "mb@gmail.com", "Edinburgh", "Office", "MSc", "more than 3 years", "No", "No"));
        }

        

        // method to add date to each selected client
        private void addInterviewDT(object sender, RoutedEventArgs e)
        {
            ShortlistedClient sc = dgr.SelectedItem as ShortlistedClient;

            if (sc != null )
            {
                sc.DT = DatePick.SelectedDate;
            }

那么我的类定义是这样的：

public class ShortlistedClient1 : Client, INotifyPropertyChanged
{
    private DateTime? _dt;

    public DateTime?  DT
    {
        get { return _dt; }
        set { _dt = value; NotifyPropertyChanged(); }
    }

    public bool InterestedinVac { get; private set; }


    public List<ShortlistedClient> clients { get; set; } = new List<ShortlistedClient1>();
    public ShortlistedClient(string n, string p, string e, string l, string wt, string q, string we, string dl, string cc) : base(n, p, e, l, wt, q, we, dl, cc)
    {
        DT = new DateTime();
        InterestedinVac = true;
    }

我尝试过的：

I have tried changing DateOnly? to DateTime? in my ShortlistedClient class, and then set { _dt = value.ToShortDateString(); .. }   but it gives an error as well.

and I have tried
```
private DateTime _dt;

        public DateTime  DT
        {
            get { return _dt; }
            set { _dt = value.Date; NotifyPropertyChanged(); }
        }

        public bool InterestedinVac { get; private set; }

        public List<ShortlistedClient> clients { get; set; } = new List<ShortlistedClient>();
        public ShortlistedClient(string n, string p, string e, string l, string wt, string q, string we, string dl, string cc) : base(n, p, e, l, wt, q, we, dl, cc)
        {
            DT = new DateTime(); 
            InterestedinVac = true; 
        }

```
which gives:
```
Error	CS0266	Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists (are you missing a cast?)

解决方案1
解决方案3

解决方案1

您可以在数据绑定中设置日期格式。例如：

XML

<DataGridTextColumn Binding="{StartDate, StringFormat=\{0:dd.MM.yy\}}" />

更新

有时在这些情况下，在主项目中实现特定功能之前创建一个原型项目来测试特定功能会很有帮助。我已经在一个快速演示项目中为您完成了此操作，展示了它的工作原理：

1. 数据模型

C＃

public class Widget
{
    public string? Name { get; set; }
    public DateTime? Date { get; set; }
}

2. 代码隐藏

C＃

public partial class MainWindow : Window
{
    private Random random = new();
    public ObservableCollection<Widget> Widgets { get; set; } = new();

    public MainWindow()
    {
        CreateWidgets();
        InitializeComponent();
    }

    private void CreateWidgets()
    {
        for (int i = 0; i < 10; i++)
        {
            Widgets.Add(new()
            {
                Name = $"Widget {i}", 
                Date = DateTime.Now.AddDays(random.NextDouble() * 5)
            });
        }
    }
}

3. 窗口：

XML

<Window x:Class="WpfDataGridDateColumnFormatting.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d"
        x:Name="Window"
        Title="MainWindow" Height="450" Width="800">

    <DataGrid DataContext="{Binding ElementName=Window}"
              ItemsSource="{Binding Widgets}"
              AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Header="Name"
                                Binding="{Binding Name}" />
            <DataGridTextColumn Header="Date"
                                Binding="{Binding Date,
                                          StringFormat=\{0:dd.MM.yy\}}" />
        </DataGrid.Columns>
    </DataGrid>
</Window>

输出的工作方式如上所述。

解决方案3

有点晚了，但问题可能是“DT”后面缺少逗号：

<datagridtextcolumn header="Interview Date" Binding="{Binding DT StringFormat=\{0:dd.MM.yy\}}" />

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