Why do I get CS8601 null pointers warning even I do null check before

November 13, 2023

I have a code piece below which creates an IplImage object from a camera and then creates a bitmap using this iplImage.

var iplImage = Globals.ActiveCamera.Acquisition?.IplImage?.ConvertTo(PixelFormatName.BGR8, ConversionMode.Fast);

if (iplImage == null)
{
    return;
}

frame = new Bitmap(Convert.ToInt16(iplImage?.Width()), Convert.ToInt16(iplImage?.Height()), Convert.ToInt16(iplImage?.PixelFormat().CalculateStorageSizeOfPixels(iplImage.Width())), System.Drawing.Imaging.PixelFormat.Format24bppRgb, iplImage.Data());

Even, I check for null and return if it is. I still get warning CS8601 when using iplImage.Data().

I’m confused what I am missing at this point.

>Solution :

My suspicion would be that the warning is because

Convert.ToInt16(iplImage?.Width())

has nullable input to Convert.ToInt16. But you know iplImage cannot be null here. So, make it Convert.ToInt16(iplImage.Width()) and Convert.ToInt16(iplImage.Height()) respective.