WPF-Base/WPF基础-1-2-和xaml一起创建/MainWindow.xaml.cs

using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Markup;

namespace WPF基础_1_2_和xaml一起创建;

/// <summary>
///     Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    public MainWindow(string xamlFile)
    {
        Width = Height = 285;
        Left = Top = 100;
        Title = "混合xaml";

        DependencyObject rootElement;
        using (var fileStream = new FileStream(xamlFile, FileMode.Open))
        {
            rootElement = (DependencyObject)XamlReader.Load(fileStream);
        }

        Content = rootElement;

        _button = (Button)LogicalTreeHelper.FindLogicalNode(rootElement, "_button");

        _button.Click += Button_OnClick;
    }

    private void Button_OnClick(object sender, RoutedEventArgs eventArgs)
    {
        _button!.Content = "栓Q";
    }
}