Bitmap source = new Bitmap(pictureBox1.Image);

                    BitmapData sourceData = source.LockBits(new Rectangle(0, 0, source.Width, source.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
                    IntPtr source_scan = sourceData.Scan0;
                  
                    unsafe
                    {
                        byte* p = (byte*)source_scan.ToPointer();

                        for (int height = 0; height < sourceData.Height; ++height)  
                        {
                            for (int width = 0; width < sourceData.Width; ++width)  
                            {

                                int r, g, b;
                                r = p[2];
                                g = p[1];
                                b = p[0];

                                p[0] = p[1] = p[2] = (byte)(255);


                                p += 3;
                            }
                            p += sourceData.Stride - (sourceData.Width * 3);
                        }
                    }

                    source.UnlockBits(sourceData);
                    pictureBox1.Image=source;
            

                }

為什麼我這段code 什麼都沒有做做  好像没有运行一样  是什麼地方錯了嗎?  我是想把圖片換成一張全白圖

刚注册的新手？