C# WPF 绑定以编程方式导致 NULL

Question

我正在尝试将代码内生成标签的背景属性设置为自定义对象属性。那么这段代码不起作用。标签正确显示，但背景属性为空值。我哪里错了？

public partial class MainWindow : Window
{

    public MainWindow()
    {
        InitializeComponent();

        Something s = new Something();

        Label testLabel = new()
        {
            Content = "TEST",
            Margin = new Thickness(5),
            Padding = new Thickness(5)
        };

        Binding binding = new("Background");
        binding.Source = s.Background;

        testLabel.SetBinding(BackgroundProperty, binding);

        stackpanel.Children.Add(testLabel);

    }
}

public class Something
{
    private Brush _background = Brushes.Green;

    public Brush Background
    {
        get { return _background; }
        set { _background = value; }
    }
}

Answer 1

绑定的源是拥有绑定属性的对象，而不是属性的值。如果将其更改为：

binding.Source = s;

绑定将正确解析。

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