Question

我正在使用Extended WPF工具包的DecimalUpDown控件，其Value属性绑定到Decimal？如下：

   <extToolkit:DecimalUpDown Value="{Binding BlahBlah, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" ShowButtonSpinner="False" />

private Decimal? blahblah = 5;
    public Decimal? BlahBlah
    {
        get { return blahblah; }
        set { blahblah = value; }
    }

我注意到，当我键入文本框中的数字时，在我点击控件外部之前，Value不会更新。在我点击外面之前，它的ValueChanged事件也不会被触发。

我打算在用户更改Value（即实时）后立即更新值。无论如何要实现这个目标吗？

Answer 1

是的，您必须使用具有UpdateSourceTrigger = PropertyChanged的控件模板替换控件模板。我去年通过复制现有模板，进行更改，然后在我的控制中使用它来做到这一点。新资源：

        <ControlTemplate x:Key="newDecimalUpDownTemplate" 
                     TargetType="{x:Type Control}">
        <extToolkit:ButtonSpinner x:Name="Spinner" 
                                  AllowSpin="{Binding AllowSpin, RelativeSource={RelativeSource TemplatedParent}}" 
                                  BorderThickness="{TemplateBinding BorderThickness}" 
                                  Background="{TemplateBinding Background}" 
                                  IsTabStop="False" 
                                  ShowButtonSpinner="{Binding ShowButtonSpinner, RelativeSource={RelativeSource TemplatedParent}}">
            <extToolkit:WatermarkTextBox x:Name="TextBox" 
                                         AcceptsReturn="False" 
                                         BorderThickness="0" 
                                         Background="{TemplateBinding Background}" 
                                         ContextMenu="{TemplateBinding ContextMenu}" 
                                         Foreground="{TemplateBinding Foreground}" 
                                         FontWeight="{TemplateBinding FontWeight}" 
                                         FontStyle="{TemplateBinding FontStyle}" 
                                         FontStretch="{TemplateBinding FontStretch}" 
                                         FontSize="{TemplateBinding FontSize}" 
                                         FontFamily="{TemplateBinding FontFamily}" 
                                         HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                         MinWidth="20" 
                                         SelectAllOnGotFocus="{Binding SelectAllOnGotFocus, RelativeSource={RelativeSource TemplatedParent}}" 
                                         TextAlignment="{Binding TextAlignment, RelativeSource={RelativeSource TemplatedParent}}" 
                                         TextWrapping="NoWrap" 
                                         Text="{Binding Text, RelativeSource={RelativeSource TemplatedParent}, UpdateSourceTrigger=PropertyChanged}" 
                                         TabIndex="{TemplateBinding TabIndex}" 
                                         VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" 
                                         WatermarkTemplate="{Binding WatermarkTemplate, RelativeSource={RelativeSource TemplatedParent}}" 
                                         Watermark="{Binding Watermark, RelativeSource={RelativeSource TemplatedParent}}">
                <extToolkit:WatermarkTextBox.IsReadOnly>
                    <Binding Path="IsEditable" RelativeSource="{RelativeSource TemplatedParent}">
                        <Binding.Converter>
                            <Converters:InverseBoolConverter/>
                        </Binding.Converter>
                    </Binding>
                </extToolkit:WatermarkTextBox.IsReadOnly>
            </extToolkit:WatermarkTextBox>
        </extToolkit:ButtonSpinner>
    </ControlTemplate>

在我的控制中：

 Template="{StaticResource newDecimalUpDownTemplate}"

Answer 2

我自己也花了一些时间来解决这个问题，并找到了一个非常好的解决方案，我编辑了模板（右键单击DecimalUpDown并转到编辑模板编辑模板，感谢Ben你为我节省了一些时间 - ＆gt; {{ 3}}）并将它与精彩的emorog解决方案结合起来！

我用一种风格写下了所有这些：

<Style x:Key="DecimalUpDownStyle1" TargetType="{x:Type xctk:DecimalUpDown}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type xctk:DecimalUpDown}">
                    <xctk:ButtonSpinner x:Name="PART_Spinner" AllowSpin="{Binding AllowSpin, RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" ButtonSpinnerLocation="{Binding ButtonSpinnerLocation, RelativeSource={RelativeSource TemplatedParent}}" Background="{TemplateBinding Background}" HorizontalContentAlignment="Stretch" IsTabStop="False" ShowButtonSpinner="{Binding ShowButtonSpinner, RelativeSource={RelativeSource TemplatedParent}}" VerticalContentAlignment="Stretch">
                        <xctk:WatermarkTextBox x:Name="PART_TextBox" Text="{Binding Text, RelativeSource={RelativeSource TemplatedParent}, UpdateSourceTrigger=PropertyChanged}" AutoMoveFocus="{Binding AutoMoveFocus, RelativeSource={RelativeSource TemplatedParent}}" AutoSelectBehavior="{Binding AutoSelectBehavior, RelativeSource={RelativeSource TemplatedParent}}" AcceptsReturn="False" BorderThickness="0" Background="Transparent" ContextMenu="{TemplateBinding ContextMenu}" Foreground="{TemplateBinding Foreground}" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsTabStop="{TemplateBinding IsTabStop}" IsUndoEnabled="True" MinWidth="20" Padding="{TemplateBinding Padding}" SelectAllOnGotFocus="{Binding SelectAllOnGotFocus, RelativeSource={RelativeSource TemplatedParent}}" TextAlignment="{Binding TextAlignment, RelativeSource={RelativeSource TemplatedParent}}" TextWrapping="NoWrap" TabIndex="{TemplateBinding TabIndex}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" WatermarkTemplate="{Binding WatermarkTemplate, RelativeSource={RelativeSource TemplatedParent}}" Watermark="{Binding Watermark, RelativeSource={RelativeSource TemplatedParent}}"/>
                    </xctk:ButtonSpinner>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

并且能够像这样使用它：

<xctk:DecimalUpDown Style="{StaticResource DecimalUpDownStyle1}" Value="{Binding DisplayValue, UpdateSourceTrigger=PropertyChanged}" />

Answer 3

我怀疑你的绑定参数在值转换中“迷失”。 NumericUpDown控件通过WatermarkTextBox在内部将Text绑定到TemplateBinding属性，以使控件尊重您可能需要在该级别应用的UpdateSourceTrigger。因此，由于此中间绑定和Value与Text之间的非直接同步，您无法控制源更新行为。

DecimalUpDown（扩展WPF工具包） - 仅在丢失焦点时更新源

3 个答案: