使用INotifyDataErrorInfo添加错误信息时向下移动项目

public class MyEntity : INotifyDataErrorInfo
{
    private Dictionary<string, List<string>> _errors = new Dictionary<string, List<string>>();

    public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;

    public bool HasErrors => _errors.Any();

    public IEnumerable GetErrors(string propertyName)
    {
        if (_errors.ContainsKey(propertyName))
        {
            return _errors[propertyName];
        }
        return null;
    }

    // 添加错误信息的方法
    private void AddError(string propertyName, string error)
    {
        if (!_errors.ContainsKey(propertyName))
        {
            _errors[propertyName] = new List<string>();
        }
        if (!_errors[propertyName].Contains(error))
        {
            _errors[propertyName].Add(error);
            OnErrorsChanged(propertyName);
        }
    }

    // 移除错误信息的方法
    private void RemoveError(string propertyName, string error)
    {
        if (_errors.ContainsKey(propertyName) && _errors[propertyName].Contains(error))
        {
            _errors[propertyName].Remove(error);
            if (_errors[propertyName].Count == 0)
            {
                _errors.Remove(propertyName);
            }
            OnErrorsChanged(propertyName);
        }
    }

    // 触发ErrorsChanged事件的方法
    private void OnErrorsChanged(string propertyName)
    {
        ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(propertyName));
    }

    // 其他属性和方法...
}

public class MyEntity : INotifyDataErrorInfo
{
    // ...

    private string _name;
    public string Name
    {
        get { return _name; }
        set
        {
            if (string.IsNullOrEmpty(value))
            {
                AddError(nameof(Name), "Name is required.");
            }
            else
            {
                RemoveError(nameof(Name), "Name is required.");
            }
            _name = value;
        }
    }

    // ...
}

<TextBox Text="{Binding Name, ValidatesOnNotifyDataErrors=True, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding (Validation.Errors)[0].ErrorContent, ElementName=textBox}" />