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Emigrant
Asked:2020-11-18 22:51:41 +0000 UTC2020-11-18 22:51:41 +0000 UTC

如何以编程方式更改资源字典中声明的键的值

  • 772

我在资源中声明了两个键：

<x:Double x:Key="LargerSize">20</x:Double>
<x:Double x:Key="BigSize">24</x:Double>

在这里使用：

<Style x:Key="baseTitleStyle" TargetType="TextBlock">
    <Setter Property="FontFamily" Value="/Assets/Fonts/Poppins-Regular.ttf#Poppins"/>
    <Setter Property="FontSize" Value="{StaticResource LargerSize}" />
</Style>

<Style x:Key="CaptionStyle" TargetType="TextBlock" BasedOn="{StaticResource baseTitleStyle}">
    <Setter Property="FontWeight" Value="Bold"/>
    <Setter Property="FontSize" Value="{StaticResource BigSize}" />
</Style>

当以这种方式以编程方式更改时：

App.Current.Resources["LargerSize"] = 16d;
App.Current.Resources["BigSize"] = 18d;

应用程序因异常而崩溃System.Exception: "Разрушительный сбой (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED))"

uwp

1 个回答

  1. Best Answer

    解决了这个问题。添加了一个FontSettings带有静态字段的类：

    public class FontSettings
{
    public static double TitleSize { get; }
    public static double CaptionSize { get; }

    static FontSettings()
    {
        FontSizeType fontSize = (FontSizeType)AppSettings.SelectedFontSize;
        switch (fontSize)
        {
            case FontSizeType.Small:
                TitleSize = 16d;
                CaptionSize = 18d;
                break;
            case FontSizeType.Medium:
                TitleSize = 18d;
                CaptionSize = 20d;
                break;
            case FontSizeType.Large:
                TitleSize = 20d;
                CaptionSize = 24d;
                break;
        }
    }
}

    与资源字典中的样式相关的静态字段：

    <local:FontSettings x:Key="FontSettings"/>

<Style x:Key="baseTitleStyle" TargetType="TextBlock">
    <Setter Property="FontFamily" Value="/Assets/Fonts/Poppins-Regular.ttf#Poppins"/>
    <Setter Property="FontSize" Value="{Binding Source={StaticResource FontSettings}, Path=TitleSize}" />
</Style>

<Style x:Key="CaptionStyle" TargetType="TextBlock" BasedOn="{StaticResource baseTitleStyle}">
    <Setter Property="FontWeight" Value="Bold"/>
    <Setter Property="FontSize" Value="{Binding Source={StaticResource FontSettings}, Path=CaptionSize}" />
</Style>
    • 0

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