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我已经看到很多关于进度条和多线程的问题和帖子，所以我希望我不是在问其他地方已经回答的问题。但如果我这样做了，我的道歉，我试图找到一个解决方案。

我有一些大文件，我想用 & 替换 & 因为这些文件很大，我希望不时看到状态更新，然后文档解析了多远。我编写的代码用于替换 & 符号，但是，只有在文档解析后才进行进度更新。有什么想法有什么问题吗？

using System;
using System.Windows;
using Microsoft.Win32;
using System.Text;
using System.Xml;
using System.IO;
using System.Diagnostics;
using System.Data.SqlClient;
using System.Data;
using System.Text.RegularExpressions;
using System.ComponentModel;

namespace DigiPort
{
    public partial class MainWindow : Window
    {

        public string filename;
        public string xmlfilename;
        BackgroundWorker worker = new BackgroundWorker();

        public MainWindow()
        {
            InitializeComponent();
        }

        private void onImportDocClicked(object sender, RoutedEventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "Text documents (.txt)|*.txt";
            Nullable<bool> result = ofd.ShowDialog();
            if (result == true)
            {
                OutPutWindow.Text = "Document wordt nu gelezen.";
                filename = ofd.FileName;
                worker.DoWork += new DoWorkEventHandler(ReplaceAmpersandAsync);
                worker.ProgressChanged += new ProgressChangedEventHandler(ProBarChanged);
                worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(ReplaceAmpersandCompleted);
                worker.WorkerReportsProgress = true;
                worker.ReportProgress(0, "Start counting lines");
                int count = ReadNumberOfLines();
                worker.ReportProgress(0, "Lines counted. Total number of lines is: " + count);
                worker.RunWorkerAsync(count);
                OutPutWindow.Text = "Document gelezen en ampersands vervangen.";
            }
        }

        private int ReadNumberOfLines()
        {
            int count = 0;
            using (FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            using (BufferedStream bs = new BufferedStream(fs))
            using (StreamReader sr = new StreamReader(bs))
                while (!sr.EndOfStream)
                {
                    sr.ReadLine();
                    count++;
                }
            return count;
        }

        private void ReplaceAmpersandAsync(object sender, DoWorkEventArgs e)
        {
            int i = 0;
            int count = (int)e.Argument;
            xmlfilename = filename + ".xml";
            StreamWriter writer = new StreamWriter(xmlfilename);
            using (FileStream fs = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            using (BufferedStream bs = new BufferedStream(fs))
            using (StreamReader sr = new StreamReader(bs))
            while (!sr.EndOfStream)
            {
                double percentage = (i++ * 100) / count;
                worker.ReportProgress((int)Math.Round(percentage, 0));
                if (i % 100000 == 0)
                {
                    worker.ReportProgress(i, "Linenumber " + i + " is now parsed");
                }
                string content = sr.ReadLine();
                writer.WriteLine(content.Replace("&", "&amp;"));
            }

            writer.Close();
            worker.ReportProgress(i, "All lines are parsed, file is saved");
        }

        private void ProBarChanged(object sender, ProgressChangedEventArgs e)
        {
            ProBar.Value = e.ProgressPercentage;
            OutPutWindow.Text += (string)e.UserState;
        }

        private void ReplaceAmpersandCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
        }
    }
}
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1 回答 1

3

你也引发了太多的事件。你不应该为每一个被解析的行引发一个事件。这将填满 Windows 消息队列，并且无法跟上。仅在您每次取得重大进展时才提出一个事件（例如，每完成 1% 就提出一个事件）。

ReportProgress 的第一个参数也应该是 0 到 100 之间的百分比，表示工作的完成程度。您在这里滥用它来返回行号：

worker.ReportProgress(i, "Linenumber " + i + " is now parsed");

还值得一提的是，您目前正在吞噬您的代码可能生成的任何异常。在完成的事件处理程序中，您应该检查是否有错误：

private void ReplaceAmpersandCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    if (e.Error != null) {
        // Show the user an error message.
    }
}
于 2013-03-19T16:07:21.013 回答