带进度条的后台工作者

Question

我正在尝试获取一个ProgressBar，其中包含使用BackgroundWorker 将数据集转换为Excel 的进度。问题是这项工作是在与ProgressBar 不同的班级中完成的，我很难从我的循环中调用worker.ReportProgress(...)。如果这是一件容易的事情，我很抱歉，但我是 C# 的新手，并且整天都在尝试这个，但似乎无法做到正确。非常感谢您的帮助。

namespace CLT
{
    public partial class GenBulkReceipts : UserControl
    {
        private void btnOpen_Click(object sender, EventArgs e)
        {
            Cursor.Current = Cursors.WaitCursor;
            try
            {
                OpenFile();
            }

            Cursor.Current = Cursors.Default;
        }
        private void OpenFile()

        {
            if (dsEx1.Tables[0].Rows.Count > 0)
            {
                  backgroundWorker1.RunWorkerAsync(dsEx1);
            }
        }

        public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker worker = sender as BackgroundWorker;
            DataSet ImportDataSet = e.Argument as DataSet;
            AccountsToBeImported = new BLLService().Get_AccountsToBeReceipted(ImportDataSet);
        }

        public void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            this.progressBar1.Value = e.ProgressPercentage;
        }

        // ...
    }
}

namespace BLL
{
    class GenBulkReceiptsBLL
    {
        public DataSet Get_AccountsToBeReceipted(DataSet dsImport)
        {
            DataSet dsReturn = AccountsDAL.QGenReceiptAccounts(0,0,"");//Kry Skoon DataSet wat ge-populate moet word

            CLT.GenBulkReceipts pb = new CLT.GenBulkReceipts();
            int TotalRows = dsImport.Tables[0].Rows.Count;
            //pb.LoadProgressBar(TotalRows);
            int calc = 1;
            int ProgressPercentage;

            foreach (DataRow dr in dsImport.Tables[0].Rows)
            {
               ProgressPercentage = (calc / TotalRows) * 100;

                //This is the problem as I need to let my Progressbar progress here but I am not sure how
                //pb.worker.ReportProgress(ProgressPercentage);
            }

            return dsReturn;
        }

        // ...
    }
}

Answer 1

您需要将您的 worker 传递给 Get_AccountsToBeReceipted 方法 - 然后它可以调用 BackgroundWorker.ReportProgress：

// In GenBulkReceipts
public void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;
    DataSet importDataSet = e.Argument as DataSet;
    AccountsToBeImported =
         new BLLService().Get_AccountsToBeReceipted(importDataSet, worker);
}

// In GenBulkReceiptsBLL
public DataSet Get_AccountsToBeReceipted(DataSet dsImport,
                                         BackgroundWorker worker)
{
    ...
    worker.ReportProgress(...);
}

或者，您可以让GenBulkReceiptsBLL 拥有自己的Progress 事件，并从GenBulkReceipts 订阅该事件 - 但这会更复杂。

Answer 2

您的类GenBulkReceiptsBLL 需要一些对BackgroundWorker 实例的引用。您可以通过多种方式实现这一目标。一种这样的建议是在实例化类时传递对类的引用。

例如，由于GenBulkReceipts 是实例化GenBulkReceiptsBLL 的类，那么在GenBulkReceiptsBLL 的构造函数中，您可以传递GenBulkReceipts 中当前正在使用的BackgroundWorker 的实例。这将允许您直接致电ReportProcess(...)。或者，您可以将引用直接传递给 Get_AccountsToBeReceipted(...) 方法。