使用backgroundworker导出到excel

Question

如何在ASP.Net（C＃）WEB应用程序中实现后台工作程序或线程，以便将大量数据导出到Excel中？有没有其他方法可以在后台导出到excel？

 <%@ Page Title="" Language="C#" MasterPageFile="~/export_module.master"
AutoEventWireup="true" CodeFile="GenerateReport.aspx.cs"
Inherits="" Async="true" %>


public readonly BackgroundWorker worker = new BackgroundWorker();

protected void Page_Load(object sender, EventArgs e)
{
 if (!Page.IsPostBack)
    {
        worker.WorkerReportsProgress = true;
        worker.WorkerSupportsCancellation = true;
        worker.DoWork += new DoWorkEventHandler(DoWork);
        //worker.ProgressChanged += new ProgressChangedEventHandler(WorkerProgressChanged);
        worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(WorkerCompleted);
    }
}

//导出到Excel单击事件

  protected void btn_Export_Click(object sender, EventArgs e)
  {        
    if (!worker.IsBusy){
      worker.RunWorkerAsync("ExportReport");
    }
  }     

// BackgroundMethod

  private void DoWork(object sender, DoWorkEventArgs e)
  {
    exportToExcel();
  }

  private void WorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
  { 
  }

//使用ClosedXML导出到Excel

  public void ExportReportWithHeaderClosedXML(string reportName, string fileName,  DataTable dataTable)
{
    int usedCells = dataTable.Columns.Count;
    string ReportDate = string.Empty;
    string attachment = "inline;filename=" + fileName + ".xlsx";
    using (XLWorkbook wb = new XLWorkbook())
    {

        //Add method of ClosedXML class library only accepts worksheet name of 31 characters.

        IXLWorksheet worksheet = wb.Worksheet(1);           

        //Insert Report Data
        worksheet.Cell(4, 1).InsertTable(dataTable);
        HttpContext.Current.Response.Clear();

        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.ClearHeaders();
        HttpContext.Current.Response.Buffer = true;

        HttpContext.Current.Response.ContentType = "application/vnd.ms-excel";
        HttpContext.Current.Response.AddHeader("Content-Disposition", "inline;filename=" + fileName + ".xlsx");
        using (MemoryStream MyMemoryStream = new MemoryStream())
        {
            wb.SaveAs(MyMemoryStream);
            MyMemoryStream.WriteTo(HttpContext.Current.Response.OutputStream);
            HttpContext.Current.Response.End();
        }
    }
}

Answer 1

如果你想开始新的单线程，那么它将是有用的。

var worker = new BackgroundWorker();
worker.DoWork += (o, ea) =>
{
       //It will execute after start new Thread.
       //Write your code for execute Export Excel.
};
worker.RunWorkerCompleted += (o, ea) =>
{
       //You will get pointer when this worker finished the job.
};
worker.RunWorkerAsync();