正確使用進度條

Question

這是我第一次在C＃中使用進度條。 我的代碼正在複製一些文件，我想通過進度條顯示進度。

我不喜歡我的代碼的事情是，我必須通過所有文件來設置最大的酒吧......後來我再次通過相同的過程複製文件。

我只是想不出一種方法來確保酒吧的流暢進步而不會做到這一點。我首先必須知道最大的權利？或者有一個竅門？

代碼看起來像這樣：

• 設置最大：

  private static void setProgressBar(List<Source> sources, List<Destination> destinations) 
  { 
      progress.Value = 0; 
      progress.Maximum = 0; 
  
      foreach (var source in sources) 
      { 
       progress.Maximum += System.IO.Directory.GetDirectories(source.directory, "*", 
        SearchOption.AllDirectories).Count() * destinations.Count + 
        System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories).Count() * 
        destinations.Count; 
      } 
  

• 複製文件：

  public static void CopyData(List<Source> sources, List<Destination> destinations, RichTextBox box, ProgressBar bar) 
  { 
      log = box; 
      progress = bar; 
      setProgressBar(sources, destinations); 
  
      foreach (var source in sources) 
      { 
       foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*", 
        SearchOption.AllDirectories)) 
       { 
        foreach (var destination in destinations) 
        { 
         logger(dirPath); 
         System.IO.Directory.CreateDirectory(dirPath.Replace(source.directory, destination.directory)); 
        } 
       } 
  
       foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories)) 
       { 
        foreach (var destination in destinations) 
        { 
         logger(newPath); 
         File.Copy(newPath, newPath.Replace(source.directory, destination.directory), true); 
        } 
       } 
      } 
  } 
  

• 增量進度條：

  private static void logger（string output） log.Text + =「Copy：」+ output + System.Environment.NewLine; log.SelectionStart = log.Text.Length; log.ScrollToCaret（）; progress.Increment（1）; }

於是我運行相同的代碼兩次......，我不喜歡這樣:)

Answer 1

我看到兩個錯誤在這裏：你永遠在了CopyData設置你的進度的值方法 和第二個是：您的CopyData方法將導致您的用戶界面凍結，直到方法完成（並且進度條此時從0跳到100％）。

您可以將您的CopyData方法放入BackgroundWorker中，並調用ReportProgress並在ReportProgress事件中設置您的酒吧的新值。

下面是它如何完成的一個例子。相反static void Main(..)呼叫從那裏您將開始您的了CopyData法

static void Main(string[] args) 
{ 
    System.ComponentModel.BackgroundWorker worker = new System.ComponentModel.BackgroundWorker(); 
    worker.ProgressChanged += Worker_ProgressChanged; 
    worker.DoWork += Worker_DoWork; 

    //Do work 
    worker.RunWorkerAsync(); 
} 

private static void Worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) 
{ 
    //Get Values 
    var source = null; 
    var destinations = null; 

    //CopyData Method 
    setProgressBar(sources, destinations); 
    foreach (var source in sources) 
    { 
     foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*", SearchOption.AllDirectories)) 
     { 
      foreach (var destination in destinations) 
      { 
       logger(dirPath); 
       System.IO.Directory.CreateDirectory(dirPath.Replace(source.directory, destination.directory)); 
       //Increase Value by 1 
       (sender as System.ComponentModel.BackgroundWorker).ReportProgress(1); 
      } 
     } 

     foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories)) 
     { 
      foreach (var destination in destinations) 
      { 
       logger(newPath); 
       File.Copy(newPath, newPath.Replace(source.directory, destination.directory), true); 
       //Increase Value by 1 
       (sender as System.ComponentModel.BackgroundWorker).ReportProgress(1); 
      } 
     } 
    } 
} 

private static void Worker_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) 
{ 
    if (e.ProgressPercentage == 1) 
    { 
     //If Value gets higher than Maximum it will cause an Exception 
     if (progress.Value < progress.Maximum) 
      progress.Value += 1; 
    } 
} 

private static void setProgressBar(List sources, List destinations) 
{ 
    progress.Value = 0; 
    progress.Maximum = 0; 
    foreach (var source in sources) 
    { 
     foreach (var dirPath in System.IO.Directory.GetDirectories(source.directory, "*", SearchOption.AllDirectories)) 
     { 
      //Simplified 
      progress.Maximum += destinations.Count; 
     } 

     foreach (var newPath in System.IO.Directory.GetFiles(source.directory, "*.*", SearchOption.AllDirectories)) 
     { 
      //Simplified 
      progress.Maximum += destinations.Count; 
     } 
    } 
}