C#后台填充列表

Question

我有一個包含大量條目（100.000 及更多）的日志文件。 我使用 Streamreader 閱讀每一行並將其保存在列表中。 列表視圖獲取列表並顯示它。

我的問題是讀取整個文件並將其存儲在列表中需要很長時間。

是否有可能在應用程序運行時在后台逐漸填充列表？ 或者有另一種讀取和加載大文件的方法嗎？

Answer 1

在.net中使用后台工作者，它也有助於顯示運行百分比，例如：

public partial class Form1 : Form
{
       private BackgroundWorker _myWorker;
       
       public Form1()
       {
           InitializeComponent();
           _myWorker = new BackgroundWorker();
           _myWorker.DoWork += _myWorker_DoWork;
           _myWorker.RunWorkerCompleted += _myWorker_RunWorkerCompleted;
           _myWorker.ProgressChanged += _myWorker_ProgressChanged;
       }

       private void _myWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
       {
           //Here you can calculate procetage of reading linses from your file
       }

       private void _myWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
       {
           //Reading from file finished:
       }

       private void _myWorker_DoWork(object sender, DoWorkEventArgs e)
       {
           var counter = 0;
           var file =new System.IO.StreamReader("<file path>");

           string line;
           while ((line = file.ReadLine()) != null)
           {
               //Adding "line" value to listView etc.
               counter++;
               var percentage = yourCalculationMethos();
               _myWorker.ReportProgress(percentage);
           }
       }
   }

Answer 2

你可以嘗試用線程來做。 這是一個解釋：

https://www.tutorialspoint.com/csharp/csharp_multithreading.htm

https://docs.microsoft.com/en-us/dotnet/standard/threading/using-threads-and-threading