C# 进度条和文本框不更新

Question

我在这里看到了一些很好的答案，想知道是否有人可以帮助我。

这是我的代码:

namespace expandGUIWPF
{

        public static string getSHA256b64(string filepath)
        {
            byte[] bytes = SHA256.Create().ComputeHash(File.ReadAllBytes(filepath));
            return Convert.ToBase64String(bytes);
        }

        private void btnRun_Click(object sender, RoutedEventArgs e)
        {
            {
                string folder = txtFolder.Text;
                string filelist = folder + "\\FileList.txt";
                string[] test = Directory.GetFiles(folder, "*", System.IO.SearchOption.AllDirectories);
                File.WriteAllLines(filelist, test);


                int length = File.ReadLines(filelist).Count();
                pBar1.Minimum = 1;
                pBar1.Maximum = length;

                File.WriteAllLines(filelist, test);

                using (StreamReader sr = new StreamReader(filelist))
                {
                    string line;
                    while ((line = sr.ReadLine()) != null)
                    {
                        string oldfile = line;
                        string newfile = oldfile + ".expanded";
                        string oldhash = "";
                        string newhash = "";

                        try
                        {
                            ProcessStartInfo startInfo = new ProcessStartInfo(@"C:\test\test.exe", oldfile + " " + newfile);
                            startInfo.WindowStyle = ProcessWindowStyle.Hidden;
                            Process.Start(startInfo);

                            Thread.Sleep(1000);

                            if (File.Exists(oldfile))
                            {
                                oldhash = getSHA256b64(oldfile);
                            }
                            if (File.Exists(newfile))
                            {
                                newhash = getSHA256b64(newfile);
                                File.Delete(oldfile);
                                File.Move(newfile, oldfile);
                            }

                            pBar1.Value = pBar1.Value + 1;

                            txtLog.AppendText(oldfile + "\r\n   Old: " + oldhash + "\r\n   New: " + newhash + "\r\n");
                            if (!(oldhash == newhash))
                            {
                                txtLog.AppendText("Successfully expanded file \r\n");
                            }
                            else
                            {
                                txtLog.AppendText("Unable to expand file \r\n");
                            }
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.ToString());
                        }
                    }
                }
            }
        }
    }
}

问题是我的进度条没有更新。我知道一点 C#，但我是 WPF 的初学者，无法设置后台工作人员来更新我的 UI。有人可以给我一些指示吗？目前该应用程序运行正常，但进度条跳到 100% 完成并且所有文本突然出现。

提前致谢!

汤姆

Answer 1

首先，您需要后台工作人员处理其 DoWork 事件中的流程。在该事件中，您可以调用 ProgressChanged 事件来更新进度条。下面是一个例子:

    private void btnRun_Click(object sender, RoutedEventArgs e)
    {
        if(workerThread.IsBusy == false)  // Make sure someone doesn't click run multiple times by mistake
        {
            pBar1.Value = 0;
            workerThread.RunWorkerAsync();
        }
    }

    private void workerThread_DoWork(object sender, DoWorkEventArgs e)
    {
        // Definitions and so forth
        pBar1.Minimum = 0;
        pBar1.Maximum = length;
        int status = 0;
        using (StreamReader sr = new StreamReader(filelist))
        {
            string line;
            while ((line = sr.ReadLine()) != null)
            {
                // Try/Catch work here
                status++;
                workerThread.ReportProgress(status);
            }
    }

    private void workerThread_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        pBar1.Value = e.ProgressPercentage;
    }