WindowsFormsTest/WpfTest/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
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;

namespace WpfTest
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            string patch = $"{AppDomain.CurrentDomain.BaseDirectory}report_with_images.pdf";
            LoadPdf(patch);
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            testcombo.Items.Add("1");
            testcombo.Items.Add("2");
        }

        private void testcombo_Loaded(object sender, RoutedEventArgs e)
        {
            var textbox = (TextBox)testcombo.Template.FindName("PART_EditableTextBox", testcombo);
            if (textbox != null)
            {
                var parent = (Border)textbox.Parent;
                parent.Background = new SolidColorBrush((System.Windows.Media.Color)System.Windows.Media.ColorConverter.ConvertFromString("#FF0087FF"));
            }
        }

        private async void LoadPdf(string pdfFilePath)
        {
            // 加载 PDF 文件
            await PdfWebView.EnsureCoreWebView2Async(null);
            PdfWebView.CoreWebView2.Navigate(pdfFilePath);
        }
        PopupTest popup = new PopupTest();
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            //myPopup.IsOpen = !myPopup.IsOpen;
            if(popup.IsLoaded)
            {
                popup.Close();
            }
            else
            {
                popup.Show();
            }
        }
    }
    public static class ComboBoxHelper
    {
        public static readonly DependencyProperty EditBackgroundProperty = DependencyProperty.RegisterAttached(
            "EditBackground", typeof(Brush), typeof(ComboBoxHelper), new PropertyMetadata(default(Brush), EditBackgroundChanged));

        // 新增：下拉框背景属性
        public static readonly DependencyProperty DropdownBackgroundProperty = DependencyProperty.RegisterAttached(
            "DropdownBackground", typeof(Brush), typeof(ComboBoxHelper), new PropertyMetadata(default(Brush), DropdownBackgroundChanged));

        private static void EditBackgroundChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
        {
            var combo = dependencyObject as ComboBox;
            if (combo != null)
            {
                if (!combo.IsLoaded)
                {
                    RoutedEventHandler comboOnLoaded = null;
                    comboOnLoaded = delegate (object sender, RoutedEventArgs eventArgs)
                    {
                        EditBackgroundChanged(dependencyObject, args);
                        combo.Loaded -= comboOnLoaded;
                    };
                    combo.Loaded += comboOnLoaded;

                    return;
                }

                var part = combo.Template.FindName("PART_EditableTextBox", combo);
                var tb = part as TextBox;
                if (tb != null)
                {
                    var parent = tb.Parent as Border;
                    if (parent != null)
                    {
                        parent.Background = (Brush)args.NewValue;
                    }
                }
            }
        }

        // 新增：下拉框背景改变处理方法
        private static void DropdownBackgroundChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
        {
            var combo = dependencyObject as ComboBox;
            if (combo != null)
            {
                if (!combo.IsLoaded)
                {
                    RoutedEventHandler comboOnLoaded = null;
                    comboOnLoaded = delegate (object sender, RoutedEventArgs eventArgs)
                    {
                        DropdownBackgroundChanged(dependencyObject, args);
                        combo.Loaded -= comboOnLoaded;
                    };
                    combo.Loaded += comboOnLoaded;
                    return;
                }

                // 查找下拉框的背景元素
                combo.ApplyTemplate();
                var dropdownBorder = combo.Template.FindName("DropDownBorder", combo) as Border;
                if (dropdownBorder != null)
                {
                    dropdownBorder.Background = (Brush)args.NewValue;
                }
            }
        }

        [AttachedPropertyBrowsableForType(typeof(ComboBox))]
        public static void SetEditBackground(DependencyObject element, Brush value)
        {
            element.SetValue(EditBackgroundProperty, value);
        }

        [AttachedPropertyBrowsableForType(typeof(ComboBox))]
        public static Brush GetEditBackground(DependencyObject element)
        {
            return (Brush)element.GetValue(EditBackgroundProperty);
        }

        // 新增：下拉框背景的访问器方法
        [AttachedPropertyBrowsableForType(typeof(ComboBox))]
        public static void SetDropdownBackground(DependencyObject element, Brush value)
        {
            element.SetValue(DropdownBackgroundProperty, value);
        }

        [AttachedPropertyBrowsableForType(typeof(ComboBox))]
        public static Brush GetDropdownBackground(DependencyObject element)
        {
            return (Brush)element.GetValue(DropdownBackgroundProperty);
        }
    }
}