Copying Charts from Excel fails

I want to copy a chart from Excel.

var chart = (ChartObject)allCharts.Item("SomeChart");
chart.Select();
chart.Copy();

The problem is, for some chart types copying failes with Not implemented (Exception from HRESULT: 0x80004001 (E_NOTIMPL)):

• Treemap
• Waterfall
• Sunburst
• Funnel
• Histogram
• Pareto
• Box and Whisker

As I am not sure, whether this is a full list, I want to somehow check the chart object before copying it.

So far, I found out two clues:

• There is a _Chart.Type, which is "Reserved for internal use." as Microsoft states. The Type gets a value of -1 for the objects above and some other values otherwise.

• _Chart.ChartType Enum seems not to include the objects above and returns an int value and no names like XlChartType.xlPieExploded.

The question is, can I rely on any of these two peculiarities or is there another way to prevent copy failure?