如何在Windows窗體C＃中實現進度條？

Question

我有我自己的解決方案，在我的Windows窗體應用程序中導入月度銷售數據。當用戶點擊import按鈕時，程序實際上正在運行，但看起來沒有響應。該過程需要大約5分鐘的時間。

所以，我想實現一個帶有狀態條標籤的進度條作爲用戶界面顯示，讓用戶知道完成了多少任務。這也是我第一次在我的程序中使用進度條。所以，我通讀了一些教程，介紹如何使用它。有些人使用進度條與後臺工作人員和計時器。

但我不明白我應該使用我擁有的解決方案。在後臺工作人員DoWork()事件？我不想通過濫用進度欄來僞造它，例如設置progressBar.Maximum = 100，progressBar.Value = 0，只要計時器正在將值增加5就可以了。進度條必須報告實際進度該程序正在運行。

以下是我現在使用的導入數據的解決方案：

private void btnImport_Click(object sender, EventArgs e) 
    { 
     if (lsbxBrowsedFiles.Items.Count != 0) 
     { 
      ArrayList salesHeaderArr = new ArrayList(); 
      ArrayList salesDetailArr = new ArrayList(); 

      int i = 0; 
      while (i < browsedXmlFileList.Count) 
      { 
       if (browsedXmlFileList[i].ToUpper().EndsWith("SALESHEADER.XML")) 
       { 
        salesHeaderArr.Add(browsedXmlFileList[i]); 
       } 
       if (browsedXmlFileList[i].ToUpper().EndsWith("SALESDETAIL.XML")) 
       { 
        salesDetailArr.Add(browsedXmlFileList[i]); 
       } 
       i++; 
      } 

      if (selectedFileIsNotInDestinationFolder(salesHeaderArr, salesDetailArr) == true) 
      { 
       i = 0; 
       while (i < salesHeaderArr.Count) 
       { 
        SalesHeader salesHeader = new SalesHeader(); 
        string sourceFilePath = salesHeaderArr[i].ToString(); 
        readXMLFiles(sourceFilePath, SALES_HEADER); 
        SalesHeader salesCheck = (SalesHeader)salesHeaderList[0]; 
        string checkOutletCode = salesCheck.OutletCode; 
        DateTime checkBusDate = salesCheck.BusinessDate.Value; 
        if (SalesHeader.IsThisRowAlreadyImportedInSalesHeader(checkOutletCode, checkBusDate) == false) 
        { 
         salesHeader.ImportSalesHeader(salesHeaderList); 
         salesHeader.CreateImportDataLog(getDestinationFilePath(sourceFilePath), 
          DateTime.Now, salesHeaderList.Count, SALES_HEADER); 
        } 
        else 
        { 
         string errorDate = checkBusDate.ToString("dd MMMM, yyyy"); 
         MessageBox.Show("Selected XML File with BusinessDate: " + errorDate + " has been already imported.", 
          "ABC Cafe Import Sales Wizard"); 
         MessageBox.Show("Please select a file which has not been imported!", 
          "ABC Cafe Import Sales Wizard"); 
         return; 
        } 
        MoveXMLFiletoDestinationFolder(sourceFilePath); 
        i++; 
       } 
       i = 0; 
       while (i < salesDetailArr.Count) 
       { 
        SalesDetail salesDetail = new SalesDetail(); 
        string sourceFilePath = salesDetailArr[i].ToString(); 
        readXMLFiles(sourceFilePath, SALES_DETAIL); 
        SalesDetail salesCheck = (SalesDetail)salesDetailList[0]; 
        string checkOutletCode = salesCheck.OutletCode; 
        DateTime checkBusDate = salesCheck.BusinessDate.Value; 
        if (SalesDetail.IsThisRowAlreadyImportedInSalesDetail(checkOutletCode, checkBusDate) == false) 
        { 
         salesDetail.ImportSalesDetail(salesDetailList); 
         salesDetail.GenerateCarryForward(salesDetailList); 
         salesDetail.CalculateImportInventoryBalance(salesDetailList); 
         salesDetail.CreateImportDataLog(getDestinationFilePath(sourceFilePath), DateTime.Now, salesDetailList.Count, SALES_DETAIL); 
        } 
        else 
        { 
         string errorDate = checkBusDate.ToString("dd MMMM, yyyy"); 
         MessageBox.Show("Selected XML File with BusinessDate: " + errorDate + " has been already imported.", 
          "ABC Cafe Import Sales Wizard"); 
         MessageBox.Show("Please select a file which has not been imported!", 
          "ABC Cafe Import Sales Wizard"); 
         return; 
        } 
        MoveXMLFiletoDestinationFolder(sourceFilePath); 
        i++; 
       } 
       MessageBox.Show("Import has been successfully completed!", 
       "ABC Cafe Import Sales Wizard"); 
       clearListBoxItems(); 
       lblMessage.Visible = false; 
      } 
      //Abort the import operation here! 
      else 
      { 
       MessageBox.Show("Please select a file which has not been imported!", 
       "ABC Cafe Import Sales Wizard"); 
       clearListBoxItems(); 
       lblMessage.Visible = false; 
      } 
     } 
     else 
     { 
      MessageBox.Show("Please select XML files to import!", 
       "ABC Cafe Import Sales Wizard"); 
     } 
    } 

任何幫助將非常感謝！

Answer 1

你的程序有很多循環，因爲這將是很難獲得增值並增加在每個循環中的進度條值iteration.You進度條最大可設置爲100，然後由數除以100的循環使用，你有十

因此，關鍵是這個值填充進度條時，每個循環完成

，是的，你應該把在的BackgroundWorker的DoWork()這個代碼，否則將凍結form.Also不需要計時器。

Answer 2

您可以使用ManualResetEvent，現在，當您正在處理時，讓Progressbar增加，直到它遇到某個點並等待Set。

例子：

你有這樣的2場

private int progress = 0; 
private ManualResetEvent reset = new ManualResetEvent(false); 
// Sets it to unsignalled 
private ManualResetEvent reset2 = new ManualResetEvent(false); 

while(progress < 40) 
{ 
    progress ++; 
} 

reset.WaitOne(); 

while(progress < 90) 
{ 
    progress ++; 
} 

reset2.WaitOne(); 

while(progress < 100) 
{ 
    progress ++; 
} 

//這完成的進度，現在你的實際工作，你必須信號的等待。

DoWork() 
{ 
    // long process here. . . . 

    reset.Set(); 

    // Another long process 

    reset2.Set(); 
} 

Answer 3

這是我在我的應用程序中如何使用Progress Bar。

private void btnNext_Click(object sender, EventArgs e) 
{ 
BackgroundWorker worker = new BackgroundWorker(); 
     worker.WorkerReportsProgress = true; 
     worker.ProgressChanged += (se, eventArgs) => { 
      this.progressBar.Maximum = 100; 
      this.progressBar.Minimum = 0; 
      this.progressBar.Value = eventArgs.ProgressPercentage; 
      lblStatus.Text = eventArgs.UserState as String; 
      lblPercentage.Text = String.Format("Progress: {0} %", eventArgs.ProgressPercentage); 
     }; 

worker.DoWork += (se, eventArgs) => { 
    int progress = 0; 
    ((BackgroundWorker)se).ReportProgress(progress, "Initializing the files..."); 

    //Process that takes a long time 
    //Formula to calculate Progress Percentage 
    //This is how I calculated for my program. Divide 100 by number of loops you have 

    int findPercentage = ((i + 1) * 100)/salesHeaderArr.Count; 
    progress = 0; 
    progress += findPercentage/2; 

    //Report back to the UI 
    string progressStatus = "Importing Sales Header... (" + getSourceFileName(sourceFilePath) + ")";  
    ((BackgroundWorker)se).ReportProgress(progress, progressStatus); 

    //After Iterating through all the loops, update the progress to "Complete" 
    ((BackgroundWorker)se).ReportProgress(100, "Complete..."); 
}; 
worker.RunWorkerCompleted += (se, eventArgs) => 
     { 
      //Display smth or update status when progress is completed 
      lblStatus.Location = new Point(20, 60); 
      lblStatus.Text = "Your import has been completed. \n\nPlease Click 'Finish' button to close the wizard or \n'Back' button to go back to the previous page."; 
      lblPercentage.Visible = false; 
      progressBar.Visible = false; 
      btnBack.Enabled = true; 
      btnFinish.Enabled = true; 
     }; 

     worker.RunWorkerAsync(); 
}