加载和编译Xaml(宝典2）

三个方式来实现wpf的应用程序

1/只使用代码

好处：就是随意的定制应用程序，相比之下xaml文档，它们只能作为固定的不变的资源嵌入到程序集中

坏处：因为wpf控件包含没有参数的构造函数，所以一个简单的控件就可写很多代码

demo:

新建一个普通类（不是窗口类）

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.Markup;

namespace WPF_Valuable
{
    class Window1:Window
    {
        private Button button1;
        public Window1()
        {
            InitializeComponent();
        }
        private void InitializeComponent()
        {
            //configure the form
            this.Width = this.Height = 285;
            this.Left = this.Top = 100;
            this.Title = "Code-only Window";

            //creater a container to hold a button
            DockPanel panel = new DockPanel();

            //Creater a button.
            button1 = new Button();
            button1.Content = "Please click me";
            button1.Margin = new System.Windows.Thickness(30);
            //Attach  the event handler
            button1.Click += button1_Click;

            IAddChild container = panel;
            container.AddChild(button1);

            container = this;
            container.AddChild(panel);

        }

        void button1_Click(object sender, RoutedEventArgs e)
        {
            //throw new NotImplementedException();
            button1.Content = "Thank you ";
        }
    }
}

 二，使用代码xaml

 public class Window1 : Window
    {
        private Button button1;        

        public Window1(string xamlFile)
        {
            InitializeComponent(xamlFile);
        }                

        private void InitializeComponent(string xamlFile)
        {
            // Configure the form.
            this.Width = this.Height = 285;
            this.Left = this.Top = 100;
            this.Title = "Dynamically Loaded XAML";

            // Get the XAML content from an external file.
            DependencyObject rootElement;
            using (FileStream fs = new FileStream(xamlFile, FileMode.Open))
            {
                rootElement = (DependencyObject)XamlReader.Load(fs);
            }

            // Insert the markup into this window.
            this.Content = rootElement;                       

            // Find the control with the appropriate name.
            //button1 = (Button)LogicalTreeHelper.FindLogicalNode(rootElement, "button1");
            FrameworkElement frameworkElement = (FrameworkElement)rootElement;
            button1 = (Button)frameworkElement.FindName("button1");

            // Wire up the event handler.
            button1.Click += new RoutedEventHandler(button1_Click);
        }
        
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            button1.Content = "Thank you.";
        }

// First approach: window with XAML content.
Window1 window1 = new Window1("Window1.xaml");
window1.Show();