c# - 是否可以为绑定(bind)内联定义转换器(没有资源)？

Question

是否可以为绑定(bind)内联定义类型转换器(无资源)？

像这样:

   <Button Visibility="{Binding ElementName=checkBox, Path=IsChecked, Converter={new BooleanToVisibilityConverter}" />

Answer 1

您可以通过自定义 MarkupExtension 创建和公开您的转换器，这将为您提供您正在寻找的内联声明:

public class BooleanToVisibilityConverterExtension : MarkupExtension, IValueConverter
{
  private BooleanToVisibilityConverter converter;

  public BooleanToVisibilityCoverterExtension() : base()
  {
    this.converter = new BooleanToVisibilityConverter();
  }

  public override object ProvideValue(IServiceProvider serviceProvider)
  {
    return this;
  }

  public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
  {
    return this.converter.Convert(value, targetType, parameter, culture);
  }

  public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
  {
    return this.converter.ConvertBack(value, targetType, parameter, culture);
  }
}

现在您可以使用 MarkupExtension 内联来创建一个新的转换器:

<Button Visibility="{Binding Converter={local:BooleanToVisibilityConverter} ...}" .. />