我正在尝试设置多个BackgroundWorker
s 来完成工作,并且在不忙的时候开始做下一点工作。我似乎无法让它们正常工作。我有下面的代码。
当我设置为FilesToProcess
等于或小于MaxThreads
它时,它可以完美地工作,尽管如果我把它设置得更高,应用程序就会冻结。
我确信这很简单,但我就是看不到它。
using System;
using System.ComponentModel;
using System.Threading;
using System.Windows.Forms;
namespace bgwtest
{
public partial class Form1 : Form
{
private const int MaxThreads = 20;
private const int FilesToProcess = 21;
private BackgroundWorker[] threadArray = new BackgroundWorker[MaxThreads];
public Form1()
{
InitializeComponent();
}
private void Form1Load(object sender, EventArgs e)
{
InitializeBackgoundWorkers();
}
private void InitializeBackgoundWorkers()
{
for (var f = 0; f < MaxThreads; f++)
{
threadArray[f] = new BackgroundWorker();
threadArray[f].DoWork += new DoWorkEventHandler(BackgroundWorkerFilesDoWork);
threadArray[f].RunWorkerCompleted += new RunWorkerCompletedEventHandler(BackgroundWorkerFilesRunWorkerCompleted);
threadArray[f].WorkerReportsProgress = true;
threadArray[f].WorkerSupportsCancellation = true;
}
}
private void button1_Click(object sender, EventArgs e)
{
for (var f = 0; f < FilesToProcess; f++)
{
var fileProcessed = false;
while (!fileProcessed)
{
for (var threadNum = 0; threadNum < MaxThreads; threadNum++)
{
if (!threadArray[threadNum].IsBusy)
{
Console.WriteLine("Starting Thread: {0}", threadNum);
threadArray[threadNum].RunWorkerAsync(f);
fileProcessed = true;
break;
}
}
if (!fileProcessed)
{
Thread.Sleep(50);
}
}
}
}
private void BackgroundWorkerFilesDoWork(object sender, DoWorkEventArgs e)
{
ProcessFile((int)e.Argument);
e.Result = (int)e.Argument;
}
private static void ProcessFile(int file)
{
Console.WriteLine("Processing File: {0}", file);
}
private void BackgroundWorkerFilesRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
if (e.Error != null)
{
MessageBox.Show(e.Error.Message);
}
Console.WriteLine("Processed File: {0}", (int)e.Result);
}
}
}