4.使用代码和未经编译的XAML创建WPF应用程序

using System.Windows;
using System.Windows.Markup;
using System.IO;
namespace WpfApp4
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        public MainWindow(string xamlFile)
        {
            this.Width = this.Height = 285;
            this.Left = this.Top = 100;
            this.Title = "Dynamically Loaded XAML";
            //从一个XAML文件里获取XAML内容
            DependencyObject rootElement;
            using (FileStream fs = new FileStream(xamlFile, FileMode.Open))
            {
                rootElement = (DependencyObject)XamlReader.Load(fs);
            }
            this.Content= rootElement;
        }
    }
}

using System;
using System.Windows;
namespace WpfApp4
{
    class Program:Application
    {
        [STAThread()]
        static void Main() { 
            Program app=new Program();
            app.MainWindow= new MainWindow("Window1.xaml");
            app.MainWindow.ShowDialog();
        }
    }
}

<DockPanel xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <Button Name="button1" Margin="30">Please click me.</Button>
</DockPanel>