如果我问了一些愚蠢的问题，很抱歉，但是我没有找到答案。我从数据库中获取DescriptionOffProduct对象到List，然后将此List绑定到Datagrid。
但是当我从数据库中获取数据时，OnPropertyChanged仍然会触发！我做错了什么？如何避免在数据导入过程中触发事件？我有一个类：

public class DescriptionOffProduct: INotifyPropertyChanged
{  
    public event PropertyChangedEventHandler PropertyChanged;
    public void OnPropertyChanged(PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, e);
    }
    private int id;
    private int producttypeid;
    private string description;
    public int Id { get; set; }
    public int ProductTypeId { get; set; }
    public string Description
    {
        get {return description;}
        set{description = value; OnPropertyChanged(new PropertyChangedEventArgs("Description"));}
    }
    public DescriptionOffProduct(int id, int producttypeid, string description)
    {
        Id = id;
        ProductTypeId = producttypeid;
        Description = description;
    }
}

XAML：

<DataGrid Grid.Row="1" x:Name="DescriptionsGrid" AutoGenerateColumns="False" Margin="10" Grid.ColumnSpan="2" >
    <DataGrid.Columns>
        <DataGridTextColumn Width="*" Header="Id описания" Binding="{Binding Path=Id, StringFormat=#{0}, Mode=OneWay}" ></DataGridTextColumn>
        <DataGridTextColumn Width="*" Header="Id типа" Binding="{Binding Path=ProductTypeId, Mode=OneWay}"></DataGridTextColumn>
        <DataGridTextColumn Width="*" Header="Описание" Binding="{Binding Path=Description, Mode=TwoWay}"></DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

我想看到这样的行为：当我在应用程序的其他地方更改Description属性时，datagrid会更新单元格中的数据。
下面是我如何绑定集合：

public void FillDescriptions()
            {
                Repository repository = new Repository();
                string sql = "select *from descriptions";
                DataTable table = repository.GetTableQuery(sql);
                var reader = table.CreateDataReader();
                using (reader)
                {
                    while (reader.Read())
                    {
                        descriptionsList.Add(new DescriptionOffProduct((int)reader["id"], (int)reader["producttypeid"], reader["description"].ToString()));
                    }
                }
                
            }

public List<DescriptionOffProduct> descriptionsList = new List<DescriptionOffProduct>();
        public List<DescriptionOffProduct> descrsOfSelected = new List<DescriptionOffProduct>();
private void TypesGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var selectedProduct = (TypeOffProduct)TypesGrid.SelectedItem;
            int IdValue = selectedProduct.Id;
            descrsOfSelected =
                descriptionsList.Where(descr => descr.ProductTypeId == IdValue).ToList();
            DescriptionsGrid.ItemsSource = descrsOfSelected;
        }