刷新 Caliburn Micro WPF 中属性更改的视图

Question

得到一个视图，其中有一个 BindingList 属性。这负责存储工作项，添加和删除。后端工作正常，但 UI 未更新。

观点：

<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>

属性:

public BindingList<WorkPieceModel> WorkPieces
{
    get { return _workPieces; }
    set
    {
        _workPieces = value; NotifyOfPropertyChange(() => WorkPieces);
        NotifyOfPropertyChange(() => CanCalculate);
    }
}

更新显示名称和设置图标显示标志的后端函数：

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 Add/Remove 时，它会正确更新元素的数量，但其余部分不会刷新按钮或 DisplayNumber。尝试在添加和移除工件后调用 NotifyOfPropertyChange()，但没有任何预期结果。

目标是仅在最后一个元素上显示 + - 图标，其余元素显示 - 图标，显示的数字始终按升序排列，而不管哪个元素已被删除。

如你所见：IV.失踪和三。有 + 图标（不应该有）

Answer 1

由于您要绑定到 IsLast，因此您应该在 WorkPieceModel class 中实现 INotifyPropertyChanged 接口，并在 PropertyChanged 中引发 PropertyChanged 事件=18=] 共 IsLast。

刷新 Caliburn Micro WPF 中属性更改的视图

Refresh view on property change in Caliburn Micro WPF

c#

wpf

caliburn.micro

刷新 Caliburn Micro WPF 中 属性 更改的视图

Refresh view on property change in Caliburn Micro WPF

c#

wpf

caliburn.micro

刷新 Caliburn Micro WPF 中属性更改的视图