XAML标记扩展

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x命名空间声明 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

x:Static 用于检索静态值，其中包括常量、静态字段、静态属性、枚举值。注意：静态值更新了，属性值依然不会更新。

using System.Windows;
using System.Windows.Media;
using System.Windows.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public const string ConstA = "content";
        public static string FieldB = "content";
        public static string PropertyC { get; set; } = "content";       
        public string dddd;   
	public MainWindow()
	{
	    InitializeComponent();      
	}     
    }

    public enum EnumD
    {
        contentaa,
        contentbb
    }
	
    private void Button_Click(object sender, RoutedEventArgs e)
    {
	FieldB = "我更新了";
    }
}

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApp1"
        Title="MainWindow">
    <StackPanel>
        <Button Content="{x:Static local:MainWindow.ConstA }" />
        <Button Content="{x:Static local:MainWindow.FieldB }" />
        <Button Content="{x:Static local:MainWindow.PropertyC }" />
        <Button Content="{x:Static local:EnumD.contentaa}" />
	<Button Content="更新值第二按钮值" Click="Button_Click"></Button>
    </StackPanel>
</Window>

 
x:Type 指定类型，如果没有命名空间前缀，就取默认的，通常是 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"下的命名空间。

<Window.Resources>
    <Style TargetType="{x:Type local:MyButton}"></Style>
    <!--<Style TargetType="local:MyButton"></Style>-->
    <Style TargetType="Button"></Style>
    <!--<Style TargetType="{x:Type Button}"></Style>
    <Style>
        <Style.TargetType>
            <x:Type TypeName="Button"></x:Type>
        </Style.TargetType>
    </Style>-->
</Window.Resources>