如何使用Bindings获取DateTime值？(WPF-MVVM)

Question

我想要这样的东西:

<DatePicker SelectedDate="{Binding StartDate}" />

对此有任何控制或简单的解决方案吗？(我使用MVVM.)

Answer 1

在这种情况下,您必须StartDate在ViewModel中只有属性才能正常工作.

当您在DatePicker中更改日期时,它将自动反映在ViewModel类的属性StartDate中.

简单的ViewModel:

class MainViewModel : INotifyPropertyChanged
    {
        private DateTime _startDate = DateTime.Now;
        public DateTime StartDate
        {
            get { return _startDate; }
            set { _startDate = value; OnPropertyChanged("StartDate");  }
        }

        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged(string name)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
                handler(this, new PropertyChangedEventArgs(name));
        }
    }

简单视图:

<Window x:Class="SimpleBinding.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" 
        Title="MainWindow" Height="350" Width="525">
    <StackPanel>    
        <DatePicker SelectedDate="{Binding StartDate}" />        
    </StackPanel>
</Window>

代码隐藏:

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();         
            this.DataContext = new MainViewModel();
        }        
    }