Cache for data grid component

MyGrid.razor

    [Parameter]
    public IEnumerable<object> DataSource {set; get; }

    private IEnumerable<object> Cache {set; get; } = null;
    List<MyColumn> Columns = new List<MyColumn>();
    public void AddColumn(MyColumn column)
    {
        var seg = DataSource;
        Cache ??= DataSource.ToList();
        DataSource = Cache;

        Columns.Add(column);
        StateHasChanged();

        DataSource = seg;
    }