Question

我正在尝试在while循环中填充我的ProgressBar。但不知何故，Progressbar的价值不会增长。

我希望代码打开一个文本文件，并为其中的每一行发布请求。

我的代码：

public void registerAccounts()
{
    const Int32 BufferSize = 128;
    using (var fileStream = File.OpenRead(nsTextBox3.Text))
    using (var streamReader = new StreamReader(fileStream, Encoding.UTF8, true, BufferSize))
    {
        String line;
        while ((line = streamReader.ReadLine()) != null)
        {
            var request = (HttpWebRequest)WebRequest.Create("http://registration.zwinky.com/registration/register.jhtml");
            var postData = "form=reg&success=http://profile.zwinky.com/zwinkyprofile/main.jhtml?username=&tp=&user.partnerId=ZZzer000&source=zwinky&design=classic&ad=/&user.userName=" + line + "&user.password=" + nsTextBox1.Text + "&user.passwordConfirm=" + nsTextBox1.Text + "&user.secretQId=1&user.secretQAnswer=" + line + "&user.birthdayMonth=1&user.birthdayDay=1&user.birthdayYear=1996&user.gender=M&user.emailAddr=" + nsTextBox2.Text + "&emailAddrConfirm=" + nsTextBox2.Text + "&x=42&y=51&partnerCode=/";
            var data = Encoding.ASCII.GetBytes(postData);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;
            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }
            var response = (HttpWebResponse)request.GetResponse();
            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        }
    }
}

如何让我的GUI中的ProgressBar现在增长？

我考虑过像这样计算文本文档中的行：

var lineCount = File.ReadLines(nsTextBox3.Text).Count();

然后在其中运行for循环。但它不会悲伤地成长。

非常感谢任何帮助。

Answer 1

您似乎在应用程序的UI线程上运行此方法。这个线程负责更新UI，所以当它忙于循环时它不能这样做。可能发生的情况是，一旦你的循环完成，进度条会直接更新为100％而你却看不到它。

请看using a Background Worker。

它以非常简单的方式为您完成所有线程和回调，从而解决了上述问题。

直接从MSDN文章中获取的示例：

using System.ComponentModel;
using System.Windows;
using System.Windows.Controls;

namespace SL_BackgroundWorker_CS
{
    public partial class Page : UserControl
    {
        private BackgroundWorker bw = new BackgroundWorker();

        public Page()
        {
            InitializeComponent();

            bw.WorkerReportsProgress = true;
            bw.WorkerSupportsCancellation = true;
            bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            bw.ProgressChanged += new ProgressChangedEventHandler(bw_ProgressChanged);
            bw.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bw_RunWorkerCompleted);
        }
        private void buttonStart_Click(object sender, RoutedEventArgs e)
        {
            if (bw.IsBusy != true)
            {
                bw.RunWorkerAsync();
            }
        }
        private void buttonCancel_Click(object sender, RoutedEventArgs e)
        {
            if (bw.WorkerSupportsCancellation == true)
            {
                bw.CancelAsync();
            }
        }
        private void bw_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;

            for (int i = 1; (i <= 10); i++)
            {
                if ((worker.CancellationPending == true))
                {
                    e.Cancel = true;
                    break;
                }
                else
                {
                    // Perform a time consuming operation and report progress.
                    System.Threading.Thread.Sleep(500);
                    worker.ReportProgress((i * 10));
                }
            }
        }
        private void bw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if ((e.Cancelled == true))
            {
                this.tbProgress.Text = "Canceled!";
            }

            else if (!(e.Error == null))
            {
                this.tbProgress.Text = ("Error: " + e.Error.Message);
            }

            else
            {
                this.tbProgress.Text = "Done!";
            }
        }
        private void bw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.tbProgress.Text = (e.ProgressPercentage.ToString() + "%");
        }
    }
}

将您的循环放在DoWork，将进度条放在ProgressChanged中。 Simples！

Answer 2

你可以试试这个，这个并不完美，但有效

int linecount=0;

while ((line = streamReader.ReadLine()) != null)
{
linecount=linecount+1;
}

int number=0;

while ((line = streamReader.ReadLine()) != null)
 {
number=number+1;

    // what is yor work

progressBar1.Value = i * progressBar1.Maximum / linecount;  //show process bar counts
LabelTotal.Text = i.ToString() + " of " + linecount; //show number of count in lable
int presentage = (i * 100) / linecount;
LabelPresentage.Text = presentage.ToString() + " %"; //show precentage in lable
Application.DoEvents(); //keep form active in every loop 
}

C＃如何在while循环中填充ProgressBar？

2 个答案: