[英]Refresh view on property change in Caliburn Micro WPF
有一个视图,它具有BindingList属性。 这负责存储工作项,添加和删除。 后端工作正常,但用户界面未更新。
风景:
<ListBox Grid.Row="7" Grid.Column="0" Grid.ColumnSpan="2" x:Name="WorkPieces" HorizontalAlignment="Stretch">
<ListBox.ItemTemplate>
<DataTemplate>
<Grid HorizontalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
<ColumnDefinition Width="auto" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="1" x:Name="DisplayName" Text="{Binding DisplayName}" MinWidth="40
" FontWeight="Bold"/>
<TextBlock Grid.Column="2" Text="{x:Static lang:Resources.Txt_W}" />
<TextBox Grid.Column="3" x:Name="Width" MinWidth="50" Text="{Binding Width}" TextAlignment="Right"/>
<TextBlock Grid.Column="4" Text=" x " />
<TextBlock Grid.Column="5" Text="{x:Static lang:Resources.Txt_L}" />
<TextBox Grid.Column="6" x:Name="Length" MinWidth="50" Text="{Binding Length}" TextAlignment="Right"/>
<Button Grid.Row="0" Grid.Column="7" Margin="5" BorderThickness="0" Background="Transparent"
Visibility="{Binding IsLast, Converter={StaticResource Converter}}">
<Image Source ="/Images/plus-sign.png" Height="16" Width="16" />
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<cal:ActionMessage MethodName="AddNewWorkPiece" />
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
<Button Grid.Row="0" Grid.Column="8" Margin="5" BorderThickness="0" Background="Transparent">
<Image Source ="/Images/minus-sign.png" Height="16" Width="16" />
<i:Interaction.Triggers>
<i:EventTrigger EventName="Click">
<cal:ActionMessage MethodName="RemoveWorkPiece">
<cal:Parameter Value="{Binding Id}" />
</cal:ActionMessage>
</i:EventTrigger>
</i:Interaction.Triggers>
</Button>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
物业:
public BindingList<WorkPieceModel> WorkPieces
{
get { return _workPieces; }
set
{
_workPieces = value; NotifyOfPropertyChange(() => WorkPieces);
NotifyOfPropertyChange(() => CanCalculate);
}
}
后端功能可更新显示名称并设置图标显示标志:
private void UpdateWorkPiecesDisplayName()
{
var counter = 1;
foreach (var item in WorkPieces)
{
item.DisplayName = Roman.To(counter);
item.IsLast = false;
counter++;
}
WorkPieces.Last().IsLast = true;
NotifyOfPropertyChange(() => WorkPieces);
}
因此,当我单击“添加/删除”时,它会正确更新元素的数量,但其余元素不会刷新按钮或DisplayNumber。 尝试在添加和移除工件之后调用NotifyOfPropertyChange(),但没有任何期望的结果。
目的是仅在最后一个元素上显示一个+-图标,其余元素显示-图标,并且所显示的数字始终递增,而不考虑哪个元素已被删除。
既然你绑定到IsLast
,应实现INotifyPropertyChanged
的接口WorkPieceModel
类和提高PropertyChanged
中的二传手事件IsLast
。
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