[C++] Bitmap使用注意事项

string file="one image path";
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(file);
Task.Run(() =>
{
  try
  {
    while (true)
    {
      for (int i = 0; i < bmp.Width; i++)
        for (int j = 0; j < bmp.Height; j++)
        {
          var c1 = bmp.GetPixel(i, j);
        }
      Thread.Sleep(100);
    }

  }
  catch (Exception ex)
  {

  }
});

Task.Run(() =>
{
  try
  {
    while (true)
    {
      for (int i = 0; i < bmp.Width; i++)
        for (int j = 0; j < bmp.Height; j++)
        {
          var c1 = bmp.GetPixel(i, j);
        }
      Thread.Sleep(100);
    }

  }
  catch (Exception ex)
  {

  }
});

string file="one image path";
System.Drawing.Bitmap bmp1 = new System.Drawing.Bitmap(file);
Task.Run(() =>
{
  try
  {
    var cpbmp1 = (Bitmap)bmp1.Clone();
    while (true)
    {
      for (int i = 0; i < cpbmp1.Width; i++)
        for (int j = 0; j < cpbmp1.Height; j++)
        {
          var c1 = cpbmp1.GetPixel(i, j);
        }
      Thread.Sleep(100);

    }
  }
  catch (Exception ex)
  {

  }
});

Task.Run(() =>
{
  try
  {
    var cpbmp2 = (Bitmap)bmp1.Clone();
    while (true)
    {
      for (int i = 0; i < cpbmp2.Width; i++)
        for (int j = 0; j < cpbmp2.Height; j++)
        {
          var c1 = cpbmp2.GetPixel(i, j);
        }
      Thread.Sleep(100);

    }
  }
  catch (Exception ex)
  {

  }
});

int times = 10;

//no. 2
System.Drawing.Bitmap bmp1 = new System.Drawing.Bitmap(file);
Stopwatch sw = new Stopwatch();
sw.Start();
for (int number = 0; number < times; number++)
  for (int i = 0; i < bmp1.Width; i++)
    for (int j = 0; j < bmp1.Height; j++)
    {
      var c1 = bmp1.GetPixel(i, j);
    }
sw.Stop();
Console.WriteLine($"{nameof(Bitmap)}:{sw.ElapsedMilliseconds}");

//no. 1
OldLockBitmap oldLockBitmap = new OldLockBitmap(bmp1);
oldLockBitmap.LockBits();
sw.Restart();
for (int number = 0; number < times; number++)
  for (int i = 0; i < bmp1.Width; i++)
    for (int j = 0; j < bmp1.Height; j++)
    {
      var c1 = oldLockBitmap.GetPixel(i, j);
    }
sw.Stop();
oldLockBitmap.UnlockBits();
Console.WriteLine($"{nameof(OldLockBitmap)}1:{sw.ElapsedMilliseconds}");