C＃ - ObservableCollection的异常＆lt;＆gt; .Add（）

Question

我是绑定逻辑的初学者，我正在关注ListView Data Sources。

我根据使用情况调整了教程，但是，WinPhone有一个例外： When converting a string to DateTime, parse the string to get the date before putting each variable into the DateTime object. 问题是我没有使用任何DateTime对象... Android抛出另一个异常 System.FormatException: One of the identified items was in an invalid format. 我虽然我的变量在我的DataTemplated对象Duration是它的原因，但我重命名它，它最终不是这个异常的原因......那么发生了什么？

我正在尝试制作以下视图，但是我没有将de map部分放在代码中，因为我只想创建我的列表。

为此，我有以下三个文件：

Page.xaml.cs

public partial class ListeCourses : ContentPage
{
    public ListeCourses()
    {
        InitializeComponent();
        initList();
    }

    ObservableCollection<Course> courses = new ObservableCollection<Course>();
    private void initList()
    {
        ListViewCourses.ItemsSource = courses;

        courses.Add(new Course { _Ride = "Caen - Narbonne", _Since = "6 mins", _Duration = "15 mins", _Pseudo = "Simca", _StopNumber = "1" });
        courses.Add(new Course { _Ride = "Le Mans - Ruaudin", _Since = "8 mins", _Duration = "8 mins", _Pseudo = "Sixela05", _StopNumber = "2" });
        courses.Add(new Course { _Ride = "Rennes - Epitech", _Since = "3 mins", _Duration = "11mins", _Pseudo = "Emixam23", _StopNumber = "1" });
    }
}

page.xaml // Each item shown on the image above have another design that just a Label, but it's not the problem at the moment, so I didn't put the final design to focus the main problem.

<ContentPage.Content>
<ListView x:Name="ListViewCourses">
  <ListView.ItemTemplate>
    <DataTemplate>
      <Grid>
        <!--Custom course cell-->
        <Grid.RowDefinitions>
          <RowDefinition Height="50dp" />
          <RowDefinition Height="50dp" />
        </Grid.RowDefinitions>

        <Grid Grid.Row="0">
          <!-- Top grid -->
          <Grid.RowDefinitions>
            <RowDefinition Height="*" />
          </Grid.RowDefinitions>
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="70*" />
            <ColumnDefinition Width="30*" />
          </Grid.ColumnDefinitions>

          <Label Text="{Binding _Ride}" Grid.Row="0" Grid.Column="0"/>
          <Label Text="{Binding _Since}" Grid.Row="0" Grid.Column="1"/>

        </Grid>

        <Grid Grid.Row="1">
          <!-- Bottom grid -->
          <Grid.RowDefinitions>
            <RowDefinition Height="*" />
          </Grid.RowDefinitions>
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width="20*" />
            <ColumnDefinition Width="30*" />
            <ColumnDefinition Width="20*" />
            <ColumnDefinition Width="15*" />
            <ColumnDefinition Width="15*" />
          </Grid.ColumnDefinitions>
        </Grid>
        <Label Text="{Binding _Duration}" Grid.Row="0" Grid.Column="0" />
        <Label Text="{Binding _Pseudo}" Grid.Row="0" Grid.Column="1" />
        <Label Text="{Binding _StopNumber}" Grid.Row="0" Grid.Column="2" />
        <Button x:Name="More" Text="+" Grid.Row="0" Grid.Column="3"/>
        <Button x:Name="Agree" Text="V" Grid.Row="0" Grid.Column="4"/>
      </Grid>
    </DataTemplate>
  </ListView.ItemTemplate>
</ListView>
</ContentPage.Content>

Course.cs

public class Course
{
    public string _Ride { get; set; }
    public string _Since { get; set; }
    public string _Duration { get; set; }
    public string _Pseudo { get; set; }
    public string _StopNumber { get; set; }
}

也许这很愚蠢，但是当我在创建这个问题时，在 TAGs部分中，Stackoverflow建议我datetime TAG ...我真的错过了什么吗？

感谢您的帮助！

调用堆栈 [外部代码]

  

Project.ni.DLL！Project.Controlers.Driver.ListeCourses.initList（）第20行C＃       Project.ni.DLL！Project.Controlers.Driver.ListeCourses.ListeCourses（）第12行C＃       Project.ni.DLL！Project.App.App（）第12行C＃       Project.WinPhone.ni.EXE！Project.WinPhone.MainPage.MainPage（）第18行C＃       [外部代码]       Project.WinPhone.ni.EXE！Project.WinPhone.App.OnLaunched（Windows.ApplicationModel.Activation.LaunchActivatedEventArgs e）第96行C＃