C＃位图类作为字段

Question

我正在尝试将此类用于处理图像，我希望它具有一个位图字段，而构造函数则可以让我允许我进入位图路径，以便其他方法可以使用该位图。所以我希望它能够做到这一点：

ImageProcessing image = new ImageProcessing("D:\image.bmp");
int time_of_processing = image.grayscale();
image.SaveTo("D:\image2.bmp");

，这是我的代码：

public class ImageProcessing
{
    Bitmap image;
    public ImageProcessing(string path)
    {
        image = new Bitmap(path);
    }
    public int Grayscale()
    {
        Stopwatch time = new Stopwatch();
        time.Start();
        for (int x = 0; x < image.Width; x++)
        {
            for (int y = 0; y < image.Height; y++)
            {
                Color pixelColor = image.GetPixel(x, y);
                int grayScale = (int)((pixelColor.R * 0.21) + (pixelColor.G * 0.72) + (pixelColor.B * 0.07));
                Color newColor = Color.FromArgb(grayScale, grayScale, grayScale);
                image.SetPixel(x, y, newColor);
            }
        }
        time.Stop();
        TimeSpan ts = time.Elapsed;
        int milliseconds = ts.Milliseconds + (ts.Seconds * 1000);
        return milliseconds;
    }
    public void SaveTo(string path)
    {
        image.Save(path);
    }
}

当我拥有这个时，Visual Studio告诉我，图像将永远是无效的。构造函数应该如何工作？

Answer 1

当您使用它时，将命名空间添加到ImageProcessing类中，以确保其始终使用正确的类。以下代码(主要仅是原始代码(已进行了测试并有效(刻在列出的图像(中。

namespace WindowsFormsApplication10
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        string path1 = @"C:worktest.bmp";
        string path2 = @"C:worktest2.bmp";
        WindowsFormsApplication10.ImageProcessing image = new WindowsFormsApplication10.ImageProcessing(path1);
        int time_of_processing = image.Grayscale();
        image.SaveTo(path2);
    }
}
public class ImageProcessing
{
    Bitmap image;
    public ImageProcessing(string path)
    {
        image = new Bitmap(path);
    }
    public int Grayscale()
    {
        Stopwatch time = new Stopwatch();
        time.Start();
        for (int x = 0; x < image.Width; x++)
        {
            for (int y = 0; y < image.Height; y++)
            {
                Color pixelColor = image.GetPixel(x, y);
                int grayScale = (int)((pixelColor.R * 0.21) + (pixelColor.G * 0.72) + (pixelColor.B * 0.07));
                Color newColor = Color.FromArgb(grayScale, grayScale, grayScale);
                image.SetPixel(x, y, newColor);
            }
        }
        time.Stop();
        TimeSpan ts = time.Elapsed;
        int milliseconds = ts.Milliseconds + (ts.Seconds * 1000);
        return milliseconds;
    }
    public void SaveTo(string path)
    {
        image.Save(path);
    }
}
}