默认值类型与属性的类型不匹配

我有这堂课

public class Tooth
{
    public string Id {get;set;}
}

而这个立方控制

public partial class ToothUI : UserControl
{
    public ToothUI()
    {
        InitializeComponent();
    }

    public Tooth Tooth
    {
        get { return (Tooth)GetValue(ToothProperty); }
        set
        {
            SetValue(ToothProperty, value);
            NombrePieza.Text =   value.Id.Replace("_",String.Empty);
        }
    }
    public static readonly DependencyProperty ToothProperty =
        DependencyProperty.Register("Tooth", typeof(Tooth), typeof(ToothUI), new PropertyMetadata(0)); 

}

我的问题是在添加牙齿依赖属性后，发生此错误

默认值类型与属性的类型不匹配

这个错误到底是什么意思？目前的设定方式是什么DP

Default value对于DP不符合您的类型。

更改

public static readonly DependencyProperty ToothProperty =
        DependencyProperty.Register("Tooth", typeof(Tooth), typeof(ToothUI),
                                         new PropertyMetadata(0));

至

public static readonly DependencyProperty ToothProperty =
        DependencyProperty.Register("Tooth", typeof(Tooth), typeof(ToothUI),
                                      new PropertyMetadata(default(Tooth)));

或者，只需省略DP的默认设置即可：

public static readonly DependencyProperty ToothProperty =
        DependencyProperty.Register("Tooth", typeof(Tooth), typeof(ToothUI));

我来这里是问题的标题，但我的类型是十进制默认值，我用此0.0M值进行了解析https://msdn.microsoft.com/zh-cn/library/83fhsxwc.aspx