Just a quick fix, the last line is wrong.
Alpha channel comes before the other values:
string hex = String.Format("#{0:X2}{1:X2}{2:X2}{3:X2}", alpha, red, green, blue);
and this is best for an extension method:
public static class ExtensionMethods
{
public static string GetHexString(this Xamarin.Forms.Color color)
{
var red = (int)(color.R * 255);
var green = (int)(color.G * 255);
var blue = (int)(color.B * 255);
var alpha = (int)(color.A * 255);
var hex = $"#{alpha:X2}{red:X2}{green:X2}{blue:X2}";
return hex;
}
}
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