我正在尝试加载一系列包含多个数据的对象,并将其作为网格显示,我选择了ListBox,如下所示:
<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,一切都很顺利,并且完美地显示出来。
第一次选择一个Person时,它可以正常工作并设置VM中的属性值。
问题出现在第二次选择不同的"Person"时。该属性不会改变,而且每次选择不同的人时,需要更长的时间(10或20次后,时间要长得多)。
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
我正在这样加载“People”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();
}
我有所遗漏吗?谢谢提前。
在@Ryan的问题之后,我每次尝试选择另一个值时都会出现很多:
'System.InvalidCastException'类型的第一次机会异常发生在Solution中
LoadPeople
是如何被调用的?是什么导致它被调用的? - Ed Chapel