而循环锁定 UI 线程

Question

我的WinForms应用程序中有一个按钮，其中包含以下单击事件：

private void Button_Click(object sender, EventArgs e)
{
treasureFound = false;
refreshNumber = 0;
Label_StartDateTime.Text = DateTime.Now.ToString("dd-MM-yyyy HH:mm:ss");
while (!treasureFound)
{
Label_StatusData.Text = "Refreshed " + refreshNumber + " times.";
refreshNumber++;
using (WebClient client = new WebClient())
{
string htmlCode = client.DownloadString(webUrl);
if (htmlCode.Contains("Treasure"))
{
treasureFound = true;
Label_StatusData.Text = "Found.";
// etc etc
}
}
}
}

单击按钮时，UI 线程将锁定(无响应，标签不会更新(，直到 while 循环结束。

如何保持 UI 响应？任何时候只能有一个 Web 客户端实例。

Answer 1

您应该在单独的线程中执行耗时的任务，这样它就不会阻塞主线程(也称为您的 UI 线程(。一种方法是使用后台工作者。

public Form1()
{
InitializeComponent();
backgroundWorker1.DoWork += backgroundWorker1_DoWork;
backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;
backgroundWorker1.WorkerReportsProgress = true;
}
private void button1_Click(object sender, EventArgs e)
{
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
for (int i = 0; i < 100; i++)
{
Thread.Sleep(1000);
backgroundWorker1.ReportProgress(i);
}
}
private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}

取自： 如何使用后台工作者？