首先，我创建了这个类：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HtmlAgilityPack;
using System.Net;
using System.Windows.Forms;
using System.ComponentModel;
using System.Threading;
namespace GatherLinks
{
class BackgroundWebCrawling
{
public string f;
int counter = 0;
List<string> WebSitesToCrawl;
int MaxSimultaneousThreads;
BackgroundWorker mainBackGroundWorker;
BackgroundWorker secondryBackGroundWorker;
WebcrawlerConfiguration webcrawlerCFG;
List<WebCrawler> webcrawlers;
int maxlevels;
public event EventHandler<BackgroundWebCrawlingProgressEventHandler> ProgressEvent;
// mainBack to make doWork event
// function that called start that get list<string> websitestocrawl anbd get int number how many threads to work at once ! in Form1 to make start to be public
// to make progress event to the main background ! mainBack first time to make it to work without progress maybe !
// to make getList function to get all lists from the webcrawlers instances !
// in the mainBack to check and create instances for secondryBackground each time.
// to the seocndry to make DoWork as it is now !
// in the secondry to call the webcrawler from the class WebCrawler .
// since WebCrawler is a class in the main background DoWork event before calling for a new thread for the secondry to make a new instance to the webCrawler class !!!
// to call to the FUNCTION webCrawler to use the e.Argument to get create instance of the webCrawler function.
// to make the progress event in the end to report for labels and richtextboxes in Form1. maybe in Form1 to use invokes for this event.
// the function start will get parameters she need and that webcrawer need from webcrawler cfg class. this list to send to each webcrawler instance.
public BackgroundWebCrawling()
{
webcrawlers = new List<WebCrawler>();
mainBackGroundWorker = new BackgroundWorker();
mainBackGroundWorker.DoWork += mainBackGroundWorker_DoWork;
}
private void mainBackGroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
for (int i = 0; i < WebSitesToCrawl.Count; i++)
{
while (counter >= MaxSimultaneousThreads)
{
Thread.Sleep(10);
}
WebCrawler wc = new WebCrawler(webcrawlerCFG);
webcrawlers.Add(wc);
counter++;
secondryBackGroundWorker = new BackgroundWorker();
secondryBackGroundWorker.DoWork += secondryBackGroundWorker_DoWork;
object[] args = new object[] { wc, WebSitesToCrawl[i] };
secondryBackGroundWorker.RunWorkerAsync(args);
}
while (counter > 0)
{
Thread.Sleep(10);
}
}
private void secondryBackGroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
object[] args = (object[])e.Argument;
WebCrawler wc = (WebCrawler)args[0];
string mainUrl = (string)args[1];
wc.ProgressEvent += new EventHandler<WebCrawler.WebCrawlerProgressEventHandler>(x_ProgressEvent);
wc.webCrawler(mainUrl, maxlevels);
counter--;
}
public void Start(List<string> sitestocrawl, int threadsNumber, int maxlevels, WebcrawlerConfiguration wccfg)
{
this.maxlevels = maxlevels;
webcrawlerCFG = wccfg;
WebSitesToCrawl = sitestocrawl;
MaxSimultaneousThreads = threadsNumber;
mainBackGroundWorker.RunWorkerAsync();
}
private void x_ProgressEvent(object sender, WebCrawler.WebCrawlerProgressEventHandler e)
{
// ok .. so now you get the data here in e
// and here you should call the event to form1
Object[] temp_arr = new Object[8];
temp_arr[0] = e.csFiles;
temp_arr[1] = e.mainUrl;
temp_arr[2] = e.levels;
temp_arr[3] = e.currentCrawlingSite;
temp_arr[4] = e.sitesToCrawl;
temp_arr[5] = e.done;
temp_arr[6] = e.failedUrls;
temp_arr[7] = e.failed;
OnProgressEvent(temp_arr); /// send the data + additional data from this class to Form1..
///
/*
* temp_arr[0] = csFiles;
temp_arr[1] = mainUrl;
temp_arr[2] = levels;
temp_arr[3] = currentCrawlingSite;
temp_arr[4] = sitesToCrawl;*/
}
private void GetLists(List<string> allWebSites)
{
}
public class BackgroundWebCrawlingProgressEventHandler : EventArgs
{
public List<string> csFiles { get; set; }
public string mainUrl { get; set; }
public int levels { get; set; }
public List<string> currentCrawlingSite { get; set; }
public List<string> sitesToCrawl { get; set; }
public bool done { get; set; }
public int failedUrls { get; set; }
public bool failed { get; set; }
}
protected void OnProgressEvent(Object[] some_params) // probably you need to some vars here to...
{
// some_params to put in evenetArgs..
if (ProgressEvent != null)
ProgressEvent(this,
new BackgroundWebCrawlingProgressEventHandler()
{
csFiles = (List<string>)some_params[0],
mainUrl = (string)some_params[1],
levels = (int)some_params[2],
currentCrawlingSite = (List<string>)some_params[3],
sitesToCrawl = (List<string>)some_params[4],
done = (bool)some_params[5],
failedUrls = (int)some_params[6],
failed = (bool)some_params[7]
});
}
}
}
在form1中我有：
private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
button3.Enabled = false;
checkBox1.Enabled = true;
checkBox2.Enabled = true;
numericUpDown1.Enabled = true;
button1.Enabled = true;
button2.Enabled = true;
this.Text = "Web Crawling";
if (cancel == true)
{
label6.Text = "Process Cancelled";
}
else
{
label6.Text = "Process Completed";
}
button6.Enabled = true;
button4.Enabled = false;
button5.Enabled = false;
listBox1.Enabled = true;
}
但是我在 Form1 中没有任何 backgroundworker1 并且这个完成的事件没有以任何方式连接到上面其他类中的任何 backgroundworkers。
当后台工作人员完成时，我如何使用/制作完成的事件将起作用？
这是 Form1 中启动后台工作程序的按钮单击事件：
private void button1_Click(object sender, EventArgs e)
{
WebcrawlerConfiguration wcfg = new WebcrawlerConfiguration();
BackgroundWebCrawling bgwc = new BackgroundWebCrawling();
wcfg.downloadcontent = downLoadImages;
wcfg.failedUrls = failedUrls;
wcfg.localy = LocalyKeyWords;
wcfg.removeext = removeExt;
wcfg.toCancel = cancel;
bgwc.Start(sites, 3, (int)numericUpDown1.Value, wcfg);
offlineOnline = false;
init();
bgwc.ProgressEvent += new EventHandler<BackgroundWebCrawling.BackgroundWebCrawlingProgressEventHandler>(bgwc_ProgressEvent);
}