列表框SelectedItem不起作用

我正在尝试将包含多个数据的对象列表加载为网格,并且为它选择了ListBox,如您在此处看到的：

<ListBox ItemsSource="{Binding People, Mode=TwoWay}" SelectedItem="{Binding Person, Mode=TwoWay}" >
  <ListBox.ItemContainerStyle>
     <Style TargetType="ListBoxItem">
        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
     </Style>
  </ListBox.ItemContainerStyle>
  <ListBox.ItemTemplate>
     <DataTemplate>
         <Grid>
             <Grid.ColumnDefinitions>
                  <ColumnDefinition Width="200"></ColumnDefinition>
                  <ColumnDefinition Width="50"></ColumnDefinition>
                  <ColumnDefinition Width="30"></ColumnDefinition>
                  <ColumnDefinition Width="50"></ColumnDefinition>
                  <ColumnDefinition Width="20"></ColumnDefinition>
             </Grid.ColumnDefinitions>
             <TextBlock VerticalAlignment="Center" Text="{Binding name}" Grid.Column="0" TextAlignment="Right"></TextBlock>
             <TextBox Grid.Column="1" Margin="5,0,0,0" Height="Auto" VerticalAlignment="Center" HorizontalAlignment="Stretch" Text="{Binding age}"></TextBox>
             <TextBlock Grid.Column="2" Text="yo" VerticalAlignment="Center" Margin="5,0,0,0"></TextBlock>
             <TextBox Grid.Column="3" Margin="5,0,0,0" Height="Auto" VerticalAlignment="Center" HorizontalAlignment="Stretch" Text="{Binding baremo}"></TextBox>
             <TextBlock Grid.Column="4" Text="€" VerticalAlignment="Center" Margin="5,0,0,0"></TextBlock>
         </Grid>
    </DataTemplate>
 </ListBox.ItemTemplate>

当我将数据加载到People ObservableCollection中时,一切正常,并且显示完美.

第一次选择Person时,它可以工作,并且可以在VM中设置属性值.

问题是我第二次选择其他“人员”.该属性不会改变,并且…每次我选择一个不同的属性时,它花费的时间会稍长一些(10ó20之后为MULON LONGER).

这是我的ViewModel代码：

#region People
        public const string PeoplePropertyName = "People";

        private ObservableCollection<Player> _People;

        public ObservableCollection<Player> People
        {
            get
            {
                return _People;
            }

            set
            {
                _People = value;
                RaisePropertyChanged(People);
            }
        }
        #endregion

        #region Person
        public const string PersonPropertyName = "Person";

        private Player _Person;

        public Player Person
        {
            get
            {
                return _Person;
            }

            set
            {
                _Person = value;
                RaisePropertyChanged(PersonPropertyName);
            }
        }
        #endregion

我正在像这样加载人员列表：

void LoadPeople(GetPlayersEventArgs e)
{
     if (this.People == null) this.People = new ObservableCollection<Player>();

        foreach (Player Person in e.Result)
        {
            Player newPerson = new Player();
            ...
            this.People.Add(newPerson);
        }

        this.SetUnBusy();
}

我错过了什么吗？提前致谢.

在我每次尝试选择其他值时都看到过@Ryan问题之后,我得到了很多：

A first chance exception of type ‘System.InvalidCastException’
occurred in Solution

解决方法:

我建议打开在抛出CLR异常时将中断的功能.如果您使用的是Visual Studio 2010或2012,请转到调试->异常(或默认情况下为Ctrl-E,D)以及在“公共语言运行时异常”下,确保选中“抛出”.然后重新运行您的解决方案,看看是否有任何问题.

然后,您将在Person对象中看到问题；)