将库中的数据绑定到 XAML

Question

我正在开发一个使用 ModernWPF 的项目。我想将 TitleBar.Background 绑定到 GetBG。这是我的代码：

using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using ModernWpf;

namespace TestApp.Desktop
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            Color GetBG()
            {
                var bc = new BrushConverter();
                if (ModernWpf.ThemeManager.GetRequestedTheme(window).ToString() == "Black" || ModernWpf.ThemeManager.GetRequestedTheme(window).ToString() == "Dark")
                {
                    return (Color)ColorConverter.ConvertFromString("#1E1E1E");
                }
                else { return (Color)ColorConverter.ConvertFromString("#E6E6E6"); }
            }
        }
    }
}

<Window x:Name="window" x:Class="OpenRelease.Desktop.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TestApp"
        mc:Ignorable="d"
        ui:ThemeManager.RequestedTheme="Light"

        <!---Here's where i want to use the binding.--->
        ui:TitleBar.Background="{GetBG}"

        ui:TitleBar.IsIconVisible="False"
        ui:ThemeManager.IsThemeAware="True"
        xmlns:ui="http://schemas.modernwpf.com/2019"
        ui:WindowHelper.UseModernWindowStyle="True"
        Title="TestApp" Height="850" Width="1260">
    <Grid>
    </Grid>

编辑，我重命名了 GetBG 并在 MainWindow.cs 文件中将其设为 public：

public Color ThemeAwareBackground()
        {
            var bc = new BrushConverter();
            if (ModernWpf.ThemeManager.GetRequestedTheme(window).ToString() == "Black" || ModernWpf.ThemeManager.GetRequestedTheme(window).ToString() == "Dark")
            {
                return (Color)ColorConverter.ConvertFromString("#1E1E1E");
            }
            else { return (Color)ColorConverter.ConvertFromString("#E6E6E6"); }
        }

谢谢。

Answer 1

要使绑定正常工作，它需要是一个依赖项属性，我相信它应该设置画笔而不是颜色。这是可能有效的依赖项属性的可能实现；在构造函数中，可以使用类似于原始 GetBG() 中的代码来确定正确的值，并设置依赖项的值属性.

public static readonly DependencyProperty ThemeAwareBackgroundBrushProperty =
    DependencyProperty.Register(
        nameof(ThemeAwareBackgroundBrush),
        typeof(SolidColorBrush),
        typeof(MainWindow),
        new PropertyMetadata(default(SolidColorBrush)));

public SolidColorBrush ThemeAwareBackgroundBrush
{
    get => (SolidColorBrush) GetValue(ThemeAwareBackgroundBrushProperty);
    set => SetValue(ThemeAwareBackgroundBrushProperty, value);
}

将库中的数据绑定到 XAML

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