如何使用后台工作者以正确的方式报告文件图像转换的进度

private int FilesNamesCounter = 0;
        private String FileName = "";
        private List<string> myGifs = new List<string>();
        private bool cancelop = false;
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker bgw = (BackgroundWorker)sender;
            int Counter = 0;
            int percentage = 0;
            int total = allfiles.Count;
            for (int i = 0; i < allfiles.Count; i++)
            {
                if (bgw.CancellationPending == true)
                {
                    pictureBox1.Image.Dispose();
                    pictureBox1.Image = Properties.Resources.Weather_Michmoret;
                    e.Cancel = true;
                    makeGif = false;
                    cancelop = true;
                    timer1.Stop();
                    break;
                }
                else
                {
                    timer1.Start();
                    Counter += 1;
                    // calculating percentage and report it
                    percentage = Counter * 100 / total;
                    bgw.ReportProgress(percentage);
                    converttogif();
                }

            }
            if (makeGif == true)
            {
                FilesNamesCounter += 1;
                unfreez.MakeGIF(myGifs, outputfile + FilesNamesCounter + ".gif", 80, true);
            }
            bgw.ReportProgress(100);
            e.Result = allfiles;
        }

转换方法：

private void converttogif()
    {
        DirectoryInfo dirinfo = new DirectoryInfo(selectedfilesdirectoryName);
        FileInfo[] gifFileInfo = dirinfo.GetFiles("*.gif");
        Image gifImage;
        for (int i = 0; i < allfiles.Count; i++)
        {
            FileName = allfiles[i];
            gifImage = Image.FromFile(gifFileInfo[i].FullName);
            gifImage.Save(FileName, System.Drawing.Imaging.ImageFormat.Gif);
            gifImage.Dispose();
            myGifs.Add(FileName);
        }
    }

进度更改事件：

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
        lblStatus.Text = "Processing......" + progressBar1.Value.ToString() + "%";
    }

已完成的活动：

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        if ((e.Cancelled == true))
        {
            button2.Enabled = false;
            lblStatus.Text = "Task Cancelled.";
        }
        else if (!(e.Error == null))
        {
            lblStatus.Text = "Error while performing background operation.";
        }
        else
        {
            lblStatus.Text = "Task Completed...";
            allfiles = (List<string>)e.Result;
            timer1.Stop();
            button1.Enabled = false;
            progressBar1.BackColor = Color.FromArgb(0, 211, 040);
            displaylastanimatedgif();
        }
    }

问题出在 DoWork 事件中的转换 gif 方法上。它将循环循环，并且每次都会一遍又一遍地循环转换 gif 中，因为我已经在 dowork 中的图像上循环了。

我想做的是以转换进度的百分比向进度栏 1 报告进度。例如，如果我在所有文件中都有 285 个要转换的文件图像，然后转换它们一次并报告每个文件将进度百分比转换为进度栏，因此整个转换应该在进度栏中从 0% 到 100% 开始，或者从 1% 到 100% 开始是合乎逻辑的。

但是报告和显示转换进度的想法。

更新

这是我现在尝试的：

private int FilesNamesCounter = 0;
        private String FileName = "";
        private List<string> myGifs = new List<string>();
        private bool cancelop = false;
        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker bgw = (BackgroundWorker)sender;            
            converttogif(bgw);            
            bgw.ReportProgress(100);
            e.Result = allfiles;
        }
        private void converttogif(BackgroundWorker bgw)
        {
            int Counter = 0;
            int percentage = 0;
            int total = allfiles.Count;
            DirectoryInfo dirinfo = new DirectoryInfo(selectedfilesdirectoryName);
            FileInfo[] gifFileInfo = dirinfo.GetFiles("*.gif");
            Image gifImage;
            for (int i = 0; i < allfiles.Count; i++)
            {
                FileName = allfiles[i];
                gifImage = Image.FromFile(gifFileInfo[i].FullName);
                gifImage.Save(FileName, System.Drawing.Imaging.ImageFormat.Gif);
                gifImage.Dispose();
                myGifs.Add(FileName);
                Counter += 1;
                // calculating percentage and report it
                percentage = Counter * 100 / total;
                bgw.ReportProgress(percentage);
            }
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progressBar1.Value = e.ProgressPercentage;
            lblStatus.Text = "Processing......" + progressBar1.Value.ToString() + "%";
        }

    private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if ((e.Cancelled == true))
            {
                button2.Enabled = false;
                lblStatus.Text = "Task Cancelled.";
            }
            else if (!(e.Error == null))
            {
                lblStatus.Text = "Error while performing background operation.";
            }
            else
            {
                if (makeGif == true)
                {
                    FilesNamesCounter += 1;
                    unfreez.MakeGIF(myGifs, outputfile + FilesNamesCounter + ".gif", 80, true);
                }
                lblStatus.Text = "Task Completed...";
                allfiles = (List<string>)e.Result;
                timer1.Stop();
                button1.Enabled = false;
                progressBar1.BackColor = Color.FromArgb(0, 211, 040);
                displaylastanimatedgif();
            }
        }

现在的问题是它达到了 99%，并且在进度条结束之前很久，就像 3/4 一样，但显示 99%，然后它正在等待我使用断点，它正在到达创建动画 gif 的已完成事件然后显示 100% 和进度条到达最后。

我该如何解决它？