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我可以为实际上是一个集合（TextDecorationCollection）的依赖属性指定任何 xaml 序列化属性吗？

我想使用序列化来克隆一个非常大而复杂的对象。这里是简化的代码示例：

有一个 MyVisualObject，它包含很多属性，包括我想克隆的自定义字体

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]
public class Export : Attribute
{
}

public class MyVisualObject : DependencyObject
{
    [Export]
    public CustomFont Font
    {
        get { return (CustomFont)GetValue(FontProperty); }
        set { SetValue(FontProperty, value); }
    }

    // Using a DependencyProperty as the backing store for Font.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty FontProperty =
        DependencyProperty.Register("Font", typeof(CustomFont), typeof(MyVisualObject));

    public MyVisualObject()
    {
        this.Font = new CustomFont();
    }
}

自定义字体定义如下：

public class CustomFont : DependencyObject
    {
        public TextDecorationCollection Decorations
        {
            get { return (TextDecorationCollection)GetValue(DecorationsProperty); }
            set { SetValue(DecorationsProperty, value); }
        }

        // Using a DependencyProperty as the backing store for TextDecorations.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty DecorationsProperty =
            DependencyProperty.Register("Decorations", typeof(TextDecorationCollection), typeof(CustomFont), new UIPropertyMetadata(new TextDecorationCollection()));

        public CustomFont()
        {
            this.Decorations = System.Windows.TextDecorations.Underline;
        }
    }

深度克隆方法：

public static T DeepClone<T>(T from)
        {
            object clone = Activator.CreateInstance(from.GetType());

            Type t = from.GetType();
            System.Reflection.PropertyInfo[] pinf = t.GetProperties();

            foreach (PropertyInfo p in pinf)
            {
                bool serialize = false;

                foreach (object temp in p.GetCustomAttributes(true))
                {
                    if (temp is Export)
                    {
                        serialize = true;
                    }
                }

                if (serialize)
                {
                    string xaml = XamlWriter.Save(p.GetValue(from, null));                        
                    XmlReader rd = XmlReader.Create(new StringReader(xaml));
                    p.SetValue(clone, XamlReader.Load(rd), null);
                }                
            }

            return (T)clone;
        }

问题是每次我将装饰初始化为下划线

this.Decorations = System.Windows.TextDecorations.Underline;

克隆过程因以下错误而崩溃：'向'System.Windows.TextDecorationCollection'类型的集合添加值引发异常。' 行号“1”和行位置“213”。

据我所知，序列化，也就是这部分

string xaml = XamlWriter.Save(p.GetValue(from, null));

返回一个没有将装饰设置为集合的 xaml：

<CustomFont xmlns="clr-namespace:WpfApplication1;assembly=WpfApplication1" xmlns:av="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <CustomFont.Decorations>
        <av:TextDecoration Location="Underline" /> 
    </CustomFont.Decorations>
</CustomFont>

但是如果 xaml 是这样的，克隆过程将起作用：

<CustomFont xmlns="clr-namespace:WpfApplication1;assembly=WpfApplication1" xmlns:av="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <CustomFont.Decorations>
        <av:TextDecorationCollection>
            <av:TextDecoration Location="Underline" /> 
        </av:TextDecorationCollection>
    </CustomFont.Decorations>
</CustomFont>

我找到了一种解决方法，使用字符串替换：

xaml = xaml.Replace("<CustomFont.Decorations><av:TextDecoration Location=\"Underline\" /></CustomFont.Decorations>", "<CustomFont.Decorations><av:TextDecorationCollection><av:TextDecoration Location=\"Underline\" /></av:TextDecorationCollection></CustomFont.Decorations>");

但我认为它真的很脏，如果你能提供一个更干净的解决方案，我会很感激（例如，为 Decorations 属性指定一个属性）

4

1 回答 1

0

您是否尝试过将以下属性应用于装饰属性：

[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
于 2011-12-14T14:33:35.177 回答