使用INotifyDataErrorInfo的交叉属性验证不起作用

using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;

public class UserModel : INotifyDataErrorInfo
{
    private string password;
    private string confirmPassword;

    public string Password
    {
        get { return password; }
        set
        {
            if (value != confirmPassword)
            {
                AddError("Password", "Password and Confirm Password do not match.");
            }
            else
            {
                RemoveError("Password");
            }

            password = value;
            RaiseErrorsChanged("Password");
            RaiseErrorsChanged("ConfirmPassword");
        }
    }

    public string ConfirmPassword
    {
        get { return confirmPassword; }
        set
        {
            if (value != password)
            {
                AddError("ConfirmPassword", "Password and Confirm Password do not match.");
            }
            else
            {
                RemoveError("ConfirmPassword");
            }

            confirmPassword = value;
            RaiseErrorsChanged("Password");
            RaiseErrorsChanged("ConfirmPassword");
        }
    }

    public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;

    public IEnumerable GetErrors(string propertyName)
    {
        // 根据属性名称返回对应的错误信息集合
        throw new NotImplementedException();
    }

    public bool HasErrors => throw new NotImplementedException();

    private void AddError(string propertyName, string error)
    {
        // 将错误信息添加到Errors集合中
        throw new NotImplementedException();
    }

    private void RemoveError(string propertyName)
    {
        // 从Errors集合中移除指定属性的错误信息
        throw new NotImplementedException();
    }

    private void RaiseErrorsChanged(string propertyName)
    {
        // 触发ErrorsChanged事件，通知数据绑定框架验证结果的变化
        ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(propertyName));
    }
}