c# - 我应该添加什么引用来修复 GetPixel 错误？

Question

在我尝试编写一些代码时，收到此错误:

Error 1 'System.Drawing.Image' does not contain a definition for 'GetPixel' and no extension method 'GetPixel' accepting a first argument of type 'System.Drawing.Image' could be found (are you missing a using directive or an assembly reference?)

有人知道我需要做什么吗？

//Create a Image-Object on which we can draw
Image bmp = new Bitmap(100, 100);
//Create the Graphics-Object to paint on the Bitmap
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
g.DrawString(randomString, myFont, new SolidBrush(Color.Black), new PointF(0, 0));
pictureBox1.Image = bmp;
bmp.Save(@"CAPTCHA.bmp", System.Drawing.Imaging.ImageFormat.Bmp);

var backgroundPixels = 0;

for (int x = 0; x < bmp.Width; x++)
  for (int y = 0; y < bmp.Height; y++)
    if (bmp.GetPixel(x, y) == Color.White)
      backgroundPixels++;

Answer 1

GetPixel 是 Bitmap 类的方法，而不是 Image 类的方法。您可以通过向构造函数提供图像来实例化位图。问题不在于您的 using 指令，而在于您使用了错误的类。