[Question] Does anyone know why my chart on ASP.Net Core only renders data on first load?

I’ve been trying to use Microcharts inside an ASP.Net Core 3.1 application and have encountered the following problems:

• The chart renders with data on the first refresh, but on subsequent refreshes it only shows the entry labels (no values or chart lines). If I restart the ASP.Net application, I can get the data to appear again.
• On that first refresh, the sizing of the Y axis is off and chart lines appear very low on chart.

I’m using .Net Core 3.1 and Microcharts 0.9.5.1. The code for my action method is below and I’m assuming I’m missing something super basic and silly, but just can’t spot it! 😅

public IActionResult ChartTest()
{	
	var entries = new[]
	{
		new ChartEntry(212)
		{
			Label = "UWP",
			ValueLabel = "212",
			Color = SKColor.Parse("#2c3e50"),
			TextColor = SKColor.Parse("#000000")
		},
		new ChartEntry(248)
		{
			Label = "Android",
			ValueLabel = "248",
			Color = SKColor.Parse("#77d065"),
			TextColor = SKColor.Parse("#000000")
		},
		new ChartEntry(128)
		{
			Label = "iOS",
			ValueLabel = "128",
			Color = SKColor.Parse("#b455b6"),
			TextColor = SKColor.Parse("#000000")
		},
		new ChartEntry(514)
		{
			Label = "Forms",
			ValueLabel = "514",
			Color = SKColor.Parse("#3498db"),
			TextColor = SKColor.Parse("#000000")
		}
	};
	
	var chart = new LineChart
	{
		Entries = entries,
		LabelOrientation = Orientation.Horizontal,
		LineMode = LineMode.Spline,
		MaxValue = 1000,
		MinValue = 0
	};
	
	var width = 800;
	var height = 500;
	
	var bitmap = new SKBitmap(width, height);
	bitmap.Erase(SKColor.Parse("#ffffff"));
	
	var canvas = new SKCanvas(bitmap);
	
	chart.DrawContent(canvas, width, height);

	using (var image = SKImage.FromPixels(bitmap.PeekPixels()))
	{
		using (var data = image.Encode(SKEncodedImageFormat.Jpeg, 100))
		{
			var memStream = new MemoryStream();
			data.SaveTo(memStream);
			memStream.Seek(0, SeekOrigin.Begin);
			
			return new FileStreamResult(memStream, "image/jpeg");
		}
	}
}

[enkomio]

Might I suggest to change the text in the README to better reflect this aspect? By reading it, it looks like Microcharts is a general purpose chart library, and this is misleading.

[eman1986]

I can alter the readme, the target audience is honestly really xamarin and desktop apps.