Windows Phone 8.1仅绑定“左”边距属性
作者:互联网
我有一个静态资源:
<x:Double x:Key="dOffset">9.6</x:Double>
我想将此资源关联到Style中的Margin.Left属性.
我尝试了这个:
<Style x:Key="HomeButtonTextContainer" TargetType="StackPanel">
<Setter Property="Margin">
<Setter.Value>
<Binding Path="Thickness">
<Binding.Source>
<local:CustomThickness Left="{StaticResource dOffset}" Top="0" Bottom="0" Right="0" />
</Binding.Source>
</Binding>
</Setter.Value>
</Setter>
</Style>
但这行不通.
我不能像以下那样将Thickness声明为资源,编译器对此有所抱怨.
<Thickness x:Key="dOffset" Left="9.6" Right="0" Left="0" Top="0"></Thickness>
我不能从Thickness类派生,因此我必须创建一个构建Thickness的Custom(CustomThickness类)
我该如何解决?
解决方法:
您不能仅设置TopMargin.您应该设置Thickness实例的所有值.如果您不想更改其他边距,只需将其设置为零即可.
XAML
<Style x:Key="HomeButtonTextContainer"
TargetType="StackPanel">
<Setter Property="Margin"
Value="{Binding Source={StaticResource dOffset},
Converter={StaticResource myConverter}}">
</Setter>
并且您应该创建返回厚度实例的转换器类:
public class MyConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
var topMargin = (double)value;
return new Thickness(0, topMargin, 0, 0);
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotImplementedException();
}
}
编辑:
Windows Phone不支持setter值的绑定.也许this文章可以帮助您.
标签:mobile,windows-phone-8-1,windows,xaml,c 来源: https://codeday.me/bug/20191121/2049018.html