如何在Windows应用程序中显示进度条？

Question

我正在使用c＃的Windows应用程序。

我有一个窗体和一个类有所有的方法。

我在类中的方法中，我在ArrayList中处理一些文件。我想为这个文件处理调用进度条方法，但它不起作用。

任何帮助

PFB我的代码片段：

public void TraverseSource() 
{ 
    string[] allFiles1 = Directory.GetFiles(sourcePath, "*.xml", SearchOption.AllDirectories); 

    var allFiles = new ArrayList(); 
    var length = allFiles.Count; 
    foreach (string item in allFiles1) 
    { 
     if (!item.Substring(item.Length - 6).Equals("MD.xml")) 
     { 
      allFiles.Add(item); 

      // Here i want to invoke progress bar which is in form 
     } 
    } 
} 

Answer 1

你想使用BackgroundWorker组件，其中DoWork处理程序包含您的实际工作（在string[] allFiles1部分及以后）。它看起来像这样：

public void TraverseSource() 
{ 
    // create the BackgroundWorker 
    var worker = new BackgroundWorker 
         { 
          WorkerReportsProgress = true 
         }; 

    // assign a delegate to the DoWork event, which is raised when `RunWorkerAsync` is called. this is where your actual work should be done 
    worker.DoWork += (sender, args) => { 
     string[] allFiles1 = Directory.GetFiles(sourcePath, "*.xml", SearchOption.AllDirectories); 

     var allFiles = new ArrayList(); 

     foreach (var i = 0; i < allFiles1.Length; i++) 
     { 
      if (!item.Substring(item.Length - 6).Equals("MD.xml")) 
      { 
       allFiles.Add(item); 
       // notifies the worker that progress has changed 
       worker.ReportProgress(i/allFiles.Length*100); 
      } 
     } 
    }; 
    // assign a delegate that is raised when `ReportProgress` is called. this delegate is invoked on the original thread, so you can safely update a WinForms control 
    worker.ProgressChanged += (sender, args) => { 
     progressBar1.Value = args.ProgressPercentage; 
    }; 

    // OK, now actually start doing work 
    worker.RunWorkerAsync(); 

}