c# 把现有图片顶部top50px 处理成白色

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/// <summary>        /// 把现有图片顶部50px刷成白色，去水印        /// </summary>        /// <param name="sender"></param>        /// <param name="e"></param>        private void btnBrushWhite_Click(object sender, EventArgs e)        {              // Create a new instance of the BackgroundWorker class            BackgroundWorker worker = new BackgroundWorker();              // Set the DoWork event handler            worker.DoWork += new DoWorkEventHandler(btnBrushWhite_ClickCore);              // Start the background worker            worker.RunWorkerAsync();              this.btnBrushWhite.Enabled = false;        }            private async void btnBrushWhite_ClickCore(object sender, DoWorkEventArgs e)        {            var appSettings = ConfigurationManager.AppSettings; // Get the appSettings object              var imgDicPath = appSettings["ImgDicPath"];            var imgDicOutPath = appSettings["ImgDicOutPath"];            // Get an array of file paths in the directory            string[] filePaths = Directory.GetFiles(imgDicPath);            if (!Directory.Exists(imgDicOutPath))            {                Directory.CreateDirectory(imgDicOutPath);            }              this.pbHandleImg.Maximum = filePaths.Length;              var count = 0;            var startTime = DateTime.Parse("2022-08-02");              for (int i = 0; i < filePaths.Length; i++)            {                await Task.Delay(10);                  this.pbHandleImg.Value = i + 1;                var filePath = filePaths[i];                  // 获取图片文件大小                FileInfo fileInfo = new FileInfo(filePath);                long fileSizeInBytes = fileInfo.Length;                //获取上次修改时间                var lastModified = fileInfo.LastWriteTime;                if (lastModified < startTime || fileSizeInBytes == 0)                {                    this.lblTips.Text = filePath + " 无需处理";                    continue;                }                this.lblTips.Text = filePath;                try                {                    using (Image imageCopy = Image.FromFile(filePath))                    {                        // Create a graphics object from the image                        using (Graphics graphics = Graphics.FromImage(imageCopy))                        {                            // Create a white brush                            using (SolidBrush whiteBrush = new SolidBrush(Color.White))                            {                                // Fill a rectangle at the top of the image with the white brush                                graphics.FillRectangle(whiteBrush, 0, 0, imageCopy.Width, 50);                                  // Save the modified image to file                                imageCopy.Save(filePath.Replace(imgDicPath, imgDicOutPath));                            }                        }                                             }                    count++;                }                catch (System.Exception ex)                {                      // Specify the file path and name                    string path =  AppDomain.CurrentDomain.BaseDirectory+"/log.txt";                      // Open the file in append mode and create it if it doesn't exist                    using (StreamWriter writer = new StreamWriter(path, true))                    {                        // Write the log message to the file                        writer.WriteLine(DateTime.Now+","+filePath+","+ex.Message);                    }                    continue;                }              }            this.btnBrushWhite.Enabled = true;            MessageBox.Show(string.Format("执行完毕，共处理{0}张图片", count));        }