DatePicker验证 - WinRT

Question

您好我正在开发一个WinRT应用程序，其中我使用DatePicker。我想做DatePicker验证，但无法找到相关的侦听器。

我发现的唯一监听者是日期改变时触发的datePicker_dateChanged。

我有两个日期选取器“dpStartDate”和“dpEndDate”，我的验证规则 dpStartDate后不能dpEndDate dpEndDate不能dpStartDate之前。

<DatePicker x:Name="dpStartDate " DateChanged="dpStartDate_DateChanged" Header="End date" Margin="0,10,0,0"></DatePicker> 
<DatePicker x:Name="dpEndDate" DateChanged="dpEndDate_DateChanged" Header="Start date" Margin="0,10,0,0"></DatePicker> 

private void dpStartDate_DateChanged(object sender, DatePickerValueChangedEventArgs e) 
    { 

    } 

    private void dpEndDate_DateChanged(object sender, DatePickerValueChangedEventArgs e) 
    { 

    } 

您能否建议如何进行验证。 如果你可以在WinRT中为datePicker提供任何其他方式的建议，这将有很大的帮助。

在此先感谢 饶

Answer 1

我建议建立类似如下：

using System; 
using System.Collections.Generic; 
using System.IO; 
using System.Linq; 
using System.Runtime.InteropServices.WindowsRuntime; 
using Windows.Foundation; 
using Windows.Foundation.Collections; 
using Windows.UI.Xaml; 
using Windows.UI.Xaml.Controls; 
using Windows.UI.Xaml.Controls.Primitives; 
using Windows.UI.Xaml.Data; 
using Windows.UI.Xaml.Input; 
using Windows.UI.Xaml.Media; 
using Windows.UI.Xaml.Navigation; 

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x409 

namespace App9 
{ 
    /// <summary> 
    /// An empty page that can be used on its own or navigated to within a Frame. 
    /// </summary> 
    public sealed partial class MainPage : Page 
    { 
     DateTimeOffset endDate; 
     public MainPage() 
     { 
      this.InitializeComponent(); 
     } 

     private void DatePickerStart_DateChanged(object sender, DatePickerValueChangedEventArgs e) 
     { 
     if (DatePickerStart.Date > DatePickerEnd.Date) 
     { 
      DatePickerEnd.Date = DatePickerStart.Date; 
      endDate = DatePickerEnd.Date; 
     } 
     } 

     private void DatePickerEnd_DateChanged(object sender, DatePickerValueChangedEventArgs e) 
     { 
      if (DatePickerStart.Date > DatePickerEnd.Date) 
      { 
       // Show message can't 
       DatePickerEnd.Date = endDate; 
      } 
      else 
      { 
       endDate = DatePickerEnd.Date; 
      } 

     } 
    } 
}