只有绑定WPF控件的保证金财产的一部分 [英] Binding only part of the margin property of WPF control

问题描述

我有这样的：

<TabControl Margin="0,24,0,0">...</TabControl>

我要到TabControl，这直观地我会做这种方式的只有顶部部分绑定：

<TabControl Margin="0,{Binding ElementName=TheMenu, Path=Height},0,0">
 ...
</TabControl>

我该怎么办呢？

推荐答案

您是否尝试过使用转换器这样吗？

Have you tried using a converter like this?

在VB.Net

Public Class MarginConverter
  Implements IValueConverter

  Public Function Convert(ByVal value As Object, ByVal targetType As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IValueConverter.Convert
    Return New Thickness(0, CDbl(value), 0, 0)
  End Function

  Public Function ConvertBack(ByVal value As Object, ByVal targetType As System.Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements System.Windows.Data.IValueConverter.ConvertBack
    Return Nothing
  End Function
End Class

或在C＃

public class MarginConverter : IValueConverter
{

    public object Convert(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return new Thickness(0, System.Convert.ToDouble(value), 0, 0);
    }

    public object ConvertBack(object value, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }
}

XAML

<Window.Resources>
    <local:MarginConverter x:Key="marginConverter"></local:MarginConverter>
</Window.Resources>
<Grid>
    <StackPanel>
        <Slider Name="Slider1"></Slider>
        <TabControl Name="TabControl" Margin="{Binding ElementName=Slider1, Path=Value, Converter={StaticResource marginConverter}}">
            <Button>Some content</Button>
        </TabControl>
    </StackPanel>
</Grid>

编辑：结果
的使用多转换的

另外，也可以在运行时获得的所有四个值并使用MultiValueConverter。的厚度对象的顶级属性不是依赖对象的，因此，你不能定义一个绑定到它（除非你的来源不是依赖对象）。

It is also possible to get all four values during run-time and use a MultiValueConverter. The Top-Property of the Thickness-Object is not a Dependency-Object, therefor you can't define a binding to it (unless your source is not a Dependency-Object).

XAML

<Window.Resources>
    <local:MarginConverter x:Key="marginConverter"></local:MarginConverter>
    <local:MultiMarginConverter x:Key="multiMarginConverter"></local:MultiMarginConverter>
</Window.Resources>
<Grid>
    <StackPanel>
        <Slider Name="Slider1"></Slider>
        <Slider Name="Slider2"></Slider>
        <Slider Name="Slider3"></Slider>
        <Slider Name="Slider4"></Slider>
        <TabControl Name="TabControl">
            <TabControl.Margin>
                <MultiBinding Converter="{StaticResource multiMarginConverter}">
                    <Binding ElementName="Slider1" Path="Value"></Binding>
                    <Binding ElementName="Slider2" Path="Value"></Binding>
                    <Binding ElementName="Slider3" Path="Value"></Binding>
                    <Binding ElementName="Slider4" Path="Value"></Binding>
                </MultiBinding>
            </TabControl.Margin>
            <Button>Some content</Button>
        </TabControl>
    </StackPanel>
</Grid>

...和C＃

  class MultiMarginConverter : IMultiValueConverter
  {
    public object Convert(object[] values, System.Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      return new Thickness(System.Convert.ToDouble(values[0]),
                           System.Convert.ToDouble(values[1]),
                           System.Convert.ToDouble(values[2]),
                           System.Convert.ToDouble(values[3]));
    }

    public object[] ConvertBack(object value, System.Type[] targetType, object parameter, System.Globalization.CultureInfo culture)
    {
      return null;
    }
  }

修改（2）反向绑定：结果
我不知道这是否会令你快乐。在我的愚见我会尽量避免这种情况，但确定......如果你的来源是依赖属性，可以绑定这边距：

Edit(2) Reverse-Binding:
I'm not sure if this will make you happy. In my humble opinion I would try to avoid this, but ok... If your source is a Dependency-Property, you can bind this to the Margin:

<Slider Name="Slider5" Minimum="-99" Maximum="0" Value="{Binding ElementName=TabControl, Path=Margin.Top, Mode=OneWayToSource}"></Slider>

不过，我有这个有一定的影响。结果
诀窍是，你不绑定您的TabControl的保证金的一部分别的东西，而是绑定别的东西到你的TabControl的保证金，并指定绑定模式的 OneWayToSource 的

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