我已经阅读了一些帖子,但没有人帮我解决问题。 所以,我有一个View with Viewmodel和View a DataGrid boudn到viewmodel里面的ObservableCollection。 Selected Item也绑定到Type T == ObservableCollection
public ObservableCollection<TableProperty> TableProperties
{
get
{
return tableProperties;
}
set
{
if (tableProperties != value)
{
tableProperties = value;
OnPropertyChanged("TableProperties");
}
}
}
public TableProperty Property
{
get
{
return property;
}
set
{
property = value;
OnPropertyChanged("Property");
}
}
这里是DataGrid:
<toolkit:DataGrid AutoGenerateColumns="False"
UseLayoutRounding="True"
ItemsSource="{Binding Path=TableProperties,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged,NotifyOnTargetUpdated=True}"
SelectedItem="{Binding Path=Property,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
[...]>
<toolkit:DataGrid.Columns>
现在我想实现一个逻辑,即更改复选框会触发命令设置所选项目的某些值:
<toolkit:DataGridTemplateColumn Header="Mandatory" IsReadOnly="False">
<toolkit:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
<CheckBox IsChecked="{Binding Path=Mandatory,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
<CheckBox.Style>
<Style TargetType="{x:Type CheckBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=MandatoryDB}" Value="True">
<Setter Property="IsEnabled" Value="False" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=MandatoryDB}" Value="False">
<Setter Property="IsEnabled" Value="True" />
</DataTrigger>
</Style.Triggers>
</Style>
</CheckBox.Style>
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<cmd:EventToCommand Command="{Binding Path=DataContext.SetMandatory, Mode=OneWay, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</StackPanel>
</DataTemplate>
</toolkit:DataGridTemplateColumn.CellTemplate>
</toolkit:DataGridTemplateColumn>
这就是它背后的命令:
private void OnSetMandatory()
{
property.Visible = true;
property.ReadOnly = false;
property.VisibleInGrid = true;
property.UIPropertyName = DateTime.Now.TimeOfDay.ToString();
OnPropertyChanged("Property");
OnPropertyChanged("TableProperties");
}
问题是:当我更改属性时,集合中的项目也已更新,并且在Property Getter中正确进行... 如果我直接在视图中调用Datagrid.Items.Refresh(),它也会正确显示值,但不会自动更新集合。
你有什么想法吗? :)
答案 0 :(得分:3)
TableProperty类必须实现INotifyPropertyChanged并正确引发它。