浅析WPF中常用属性的相关概念和应用

public class Person
{
	/// <summary>
	/// 私有字段
	/// </summary>
	private int id = 0;
 
	/// <summary>
	/// 公共字段
	/// </summary>
	public string Name = "Alan";
 
	/// <summary>
	/// 字段校验函数
	/// </summary>
	/// <param name="name"></param>
	/// <returns></returns>
	public bool SetName(string name)
	{
		if (string.IsNullOrEmpty(name) || name == "Admin")
		{
			return false;
		}
		this.Name = name;
		return true;
	}
 
	public void Do()
	{
		//在此示例中，Name的值，可通过公共字段进行赋值，也可通过SetName方法赋值，但是我们无法要求调用对象强制采用哪一种，，因为看起来两种都可以。
		Console.WriteLine($"Name={this.Name}");
	}
}

public class Person
{ 
	private string name =String.Empty;
	/// <summary>
	/// 属性
	/// </summary>
	public string Name {
		get { return name; }
		set
		{
			if (string.IsNullOrEmpty(value) || value == "Admin")
			{
				return;
			}
			name = value;
		}
	}
 
	public void Do()
	{
		//引入属性后，可以在属性的set方法中进行校验。
		Console.WriteLine($"Name={this.Name}");
	}
}

public partial class Test : UserControl
{
	public int Age
	{
		get { return (int)GetValue(AgeProperty); }
		set { SetValue(AgeProperty, value); }
	}
 
	public static readonly DependencyProperty AgeProperty =
		DependencyProperty.Register("Age", typeof(int), typeof(Test), new PropertyMetadata(0, AgeChangedCallBack));
 
 
	private static void AgeChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
	{
		//处理变更后的逻辑
		var test = d as Test;
		var newValue = e.NewValue;
        test.txtAge.Text = newValue.ToString();
	}
 
	public Test()
	{
		InitializeComponent();
	}
}

<UserControl x:Class="DemoMVVM.Views.Test"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:DemoMVVM.Views"
             mc:Ignorable="d" 
             d:DesignHeight="450" d:DesignWidth="800">
    <Grid>
        <StackPanel Orientation="Vertical">
            <TextBlock Text="年龄：" FontSize="14"></TextBlock>
            <TextBox x:Name="txtAge" Height="30" Width="150" HorizontalAlignment="Left" VerticalContentAlignment="Center" FontSize="14"></TextBox>
        </StackPanel>
    </Grid>
</UserControl>

<Window x:Class="DemoMVVM.TestWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DemoMVVM"
        xmlns:localView="clr-namespace:DemoMVVM.Views"
        mc:Ignorable="d"
        Title="TestWindow" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <localView:Test x:Name="test" Margin="10" Age="{Binding ElementName=t1, Path=Value}"></localView:Test>
        <Slider x:Name="t1" Width="200" Height="30" Grid.Row="1" Minimum="0" Maximum="100" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10" Interval="1"></Slider>
    </Grid>
</Window>

public static int GetDistance(DependencyObject obj)
{
    return (int)obj.GetValue(DistanceProperty);
}
 
public static void SetDistance(DependencyObject obj, int value)
{
    obj.SetValue(DistanceProperty, value);
}
 
 
public static readonly DependencyProperty DistanceProperty =
    DependencyProperty.RegisterAttached("Distance", typeof(int), typeof(Test), new PropertyMetadata(0));