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I’ve got an OhlcDataSeries<DateTime, double> and I’m trying to add a VerticalLineAnnotation by setting X1 = DateTime.UtcNow.AddDays(-2).

However, when the annotation is added, I get an InvalidCastException saying it can’t convert from DateTime to Int32.

What gives?


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Hi Georgios,

Probably the reason why this happens is that you use the CategoryDateTimeAxis. It uses IndexRange as VisibleRange, not DateRange. So to place an annotation, you need to convert a data value to its index. Please take a look at the article on coordinate transformation here:
(see under the “CoordinateCalculators API when using CategoryDateTimeAxis” paragraph)

Also this thread may be helpful:

Hope this helps! Please feel free to comment if you have any questions,

Best regards,

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