如何更新DataGrid (WPF)中的行号？

private void DataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.Column.DisplayIndex == 0)
    {
        DataGridTextColumn column = new DataGridTextColumn();
        column.Header = "行号";
        column.Binding = new Binding("DataGridRow.Header");
        e.Column = column;
    }
}

private void DataGrid_LoadingRow(object sender, DataGridRowEventArgs e)
{
    e.Row.Header = (e.Row.GetIndex() + 1).ToString();
}

<DataGrid x:Name="dataGrid" AutoGeneratingColumn="DataGrid_AutoGeneratingColumn" LoadingRow="DataGrid_LoadingRow">
    <!-- DataGrid的其他设置 -->
</DataGrid>