用于单选/复选框的 Xaml 绑定以在英制/公制之间切换
正如标题所述，我正在从 Db 中获取一些值，这些值均以公里为单位，但我想实现一个转换器，可以在英里或公里之间切换，并希望将其绑定到显示的复选框，或单选按钮组，以最简单的为准（首选单选按钮）。
我想我可以只使用 IValueConverter 而不是 IMultiValueConverter 和 Convert/ConvertBack 方法，因为默认值为公里，但我不知道如何调用 ConvertBack 方法。或者我可以将 true/false 作为 ConverterParameter 传递，具体取决于我是否希望显示公里/英里。
但无论哪种方式，我都不确定如何在任一方法上连接 Xaml 绑定（我知道如何进行标准值转换器绑定，但不知道所需的额外内容。
任何提示表示赞赏。
<StackPanel Grid.Row="0" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Right">
<RadioButton Content="Km" GroupName="rdBtnGrpValue" IsChecked="True" />
<RadioButton Content="Miles" GroupName="rdBtnGrpValue" />
</StackPanel>
并且：
<TextBox HorizontalAlignment="Stretch" VerticalAlignment="Top" Grid.Column="1" Text="{Binding EquatorialCircumference, Converter={StaticResource KmMiConv}, StringFormat='{}{0:0,0.0}'}" />
Pretty much as the title states, I'm grabbing some values from a Db, which are all in Km, but I want to implement a converter which I can toggle between Miles or Kilometers, and want to bind which is displayed to either a checkbox, or a radio button group, whichever is easiest (Radio would be preferred).
I'm thinking I can just use an IValueConverter rather than an IMultiValueConverter, and the Convert/ConvertBack methods, as the default will be Kilometers, but I don't know how to call the ConvertBack method. Or I could pass true/false as the ConverterParameter depending on whether I want Km/Miles displayed.
But either way I'm not sure how to hook up the Xaml Binding on either method (I know how to do a standard value converter binding, but not the extra flumff needed.
Any hints appreciated.
<StackPanel Grid.Row="0" Grid.ColumnSpan="2" Orientation="Horizontal" HorizontalAlignment="Right">
<RadioButton Content="Km" GroupName="rdBtnGrpValue" IsChecked="True" />
<RadioButton Content="Miles" GroupName="rdBtnGrpValue" />
</StackPanel>
And:
<TextBox HorizontalAlignment="Stretch" VerticalAlignment="Top" Grid.Column="1" Text="{Binding EquatorialCircumference, Converter={StaticResource KmMiConv}, StringFormat='{}{0:0,0.0}'}" />
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如果您使用 MVVM 模式，并且使用视图模型作为
DataContext，则可以在RadioButton之间使用Mode=TwoWay绑定>s 和视图模型中的布尔属性，例如 bool ConvertToImperial { get;放; }。您的实际转换可以在
EquatorialCircumference属性的 getter 中进行。如果ConvertToImperial为true，则返回以英里为单位的值，否则返回以公里为单位的值。然后，对于
TextBox，您只需将其绑定到EquatorialCircumference属性，显示的值将采用所选单位。但是，您需要针对其值受单位更改影响的任何属性发出属性更改通知。
If you are using the MVVM pattern, and are using a view-model as your
DataContext, you could use aMode=TwoWaybinding between theRadioButtons and a boolean property in the view-model, something likebool ConvertToImperial { get; set; }.Your actual conversion can occur in the getter for the
EquatorialCircumferenceproperty. IfConvertToImperialistrue, return the value in miles, otherwise return the value in kilometres.Then, for the
TextBox, you can simply bind it to theEquatorialCircumferenceproperty, and the value displayed will be in the selected unit.You will, however, need to raise a property change notification for any properties whose values are affected by a change in units.