C# 在BorderThinkness中使用StringFormat绑定int属性
我有一个具有自己属性BorderWidth的模板:C# 在BorderThinkness中使用StringFormat绑定int属性,c#,wpf,templates,string-formatting,C#,Wpf,Templates,String Formatting,我有一个具有自己属性BorderWidth的模板: public static readonly DependencyProperty BorderWidthProperty = DependencyProperty.Register("BorderWidth", typeof(int), typeof(ProjectOverviewSensor), new PropertyMetadata(1)); 现在,我想在模板中使用StringFormat将此属性绑定到BorderThickness,
public static readonly DependencyProperty BorderWidthProperty = DependencyProperty.Register("BorderWidth", typeof(int), typeof(ProjectOverviewSensor), new PropertyMetadata(1));
现在,我想在模板中使用StringFormat将此属性绑定到BorderThickness,以创建特定边的边界。但它在所有四个方面都是1
<Border BorderThickness="{Binding Path=BorderWidth, RelativeSource={RelativeSource TemplatedParent}, StringFormat='{}{0},0,{0},0'}"></Border>
我如何才能将财产仅绑定到我想要的边界控制的两侧?是否有stringformat的替代品?Binding.stringformat仅适用于System.String类型的属性
对于用XAML编写的字符串,情况就不同了,因为在这里,XAML解析器在解析过程中将字符串转换为厚度值
要执行所需操作,您需要绑定上的转换器:
class MyConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if(value == DependencyProperty.UnsetValue)
return value;
return new Thickness((int)value,0, (int)value, 0);
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
return ((Thickness)value).Left;
}
}
然后像这样使用:
<Window.Resources>
<MyConverter x:Key="ToThickness"/>
</Window.Resources>
<Border BorderThickness="{Binding Path=BorderWidth, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource ToThickness}"></Border>
现在我创建了一个扩展转换器,我希望他不要对你隐瞒
public class CustomThicknessConverter : IValueConverter
{
protected readonly char SplitChar = ',';
protected readonly char ReplaceAt = '#';
/// <summary>
/// Create a thickness with custom format(for example #,2,#,5).
/// </summary>
/// Number for default width.
/// # for given border width.
/// ; for split the chars.
/// For example '#,0,#,0' with 1 as value return a new thickness
/// with Left = 1, Top = 0, Right = 1, Bottom = 0.
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if(value == DependencyProperty.UnsetValue)
return value;
var borderWidth = value as double?;
var format = parameter.ToString().Split(SplitChar);
if(format.Length == 1)
return new Thickness(GetValue(borderWidth, format[0]));
else if(format.Length == 2)
{
return new Thickness()
{
Left = GetValue(borderWidth, format[0]),
Top = GetValue(borderWidth, format[1]),
Right = GetValue(borderWidth, format[0]),
Bottom = GetValue(borderWidth, format[1])
};
}
else if(format.Length == 4)
{
return new Thickness()
{
Left = GetValue(borderWidth, format[0]),
Top = GetValue(borderWidth, format[1]),
Right = GetValue(borderWidth, format[2]),
Bottom = GetValue(borderWidth, format[3])
};
}
return new Thickness(0);
}
private double GetValue(double? value, string format)
{
if(format.FirstOrDefault() == ReplaceAt) return value ?? 0;
double result;
return (Double.TryParse(format, out result)) ? result : 0;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
在xaml中:
<local:CustomThicknessConverter x:Key="CustomThicknessConverter" />
<Border BorderThickness="{Binding BorderWidth, RelativeSource={RelativeSource TemplatedParent}, Converter={StaticResource CustomThicknessConverter}, ConverterParameter='0,#,0,#'}">
</Border>
将BorderWidth的类型更改为厚度是一种替代方法吗?a有一个具有多个边框的模板,这些边框具有统一的边框宽度,但所有边框都在不同的侧面接收边框宽度。在我看来,为每个边界创建一个自己的属性是非常糟糕的