如何阅读在C＃Windows.UI.XAML.Style性能

问题描述

我写一个类，将一个HTML文档转换为可在Windows 8应用RichTextBlock使用Paragrpahs列表。我希望能够给类XAML定义，该类将从样式读有用的特性，并将其应用样式列表。

I am writing a class that will convert a HTML document to a list of Paragrpahs that can be used with RichTextBlock in Windows 8 apps. I want to be able to give the class a list of Styles defined in XAML and the class will read useful properties from the style and apply them.

如果我有一个Windows .UI.XAML.Style 风格我怎么读它的属性？我试过

If I have a Windows.UI.XAML.Style style how do I read a property from it? I tried

var fontWeight = style.GetValue(TextElement.FontWeightProperty)

为风格在XAML中定义的TargetProperty =TextBlock的，但这种失败和异常

for a style defined in XAML with TargetProperty="TextBlock" but this fails with and exception

推荐答案

您可以试试这个：

var fontWeightSetter =
    style.Setters.Cast<Setter>().FirstOrDefault(
        setter => setter.Property == TextElement.FontWeightProperty);

var fontWeight =
    fontWeightSetter != null ?
        (FontWeight)fontWeightSetter.Value :
        FontWeights.Normal;

或检查其是否正常工作：

Or check if that works:

public static class StyleExtensions
{
    // Untested
    public static object GetPropertyValue(this Style style, DependencyProperty property)
    {
        var setter =
            style.Setters.Cast<Setter>().FirstOrDefault(
                s => s.Property == property);
        var value = setter != null ? setter.Value : null;

        if (setter == null &&
            style.BasedOn != null)
        {
            value = style.BasedOn.GetPropertyValue(property);
        }

        return value;
    }
}

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