I wanted to store some pixels locations without allowing duplicates, so the first thing comes to mind is HashSet<Point>
or similar classes. However this seems to be very slow compared to something like HashSet<string>
.
For example, this code:
HashSet<Point> points = new HashSet<Point>();
using (Bitmap img = new Bitmap(1000, 1000))
{
for (int x = 0; x < img.Width; x++)
{
for (int y = 0; y < img.Height; y++)
{
points.Add(new Point(x, y));
}
}
}
takes about 22.5 seconds.
While the following code (which is not a good choice for obvious reasons) takes only 1.6 seconds:
HashSet<string> points = new HashSet<string>();
using (Bitmap img = new Bitmap(1000, 1000))
{
for (int x = 0; x < img.Width; x++)
{
for (int y = 0; y < img.Height; y++)
{
points.Add(x + "," + y);
}
}
}
So, my questions are:
- Is there a reason for that? I checked this answer, but 22.5 sec is way more than the numbers shown in that answer.
- Is there a better way to store points without duplicates?