允许取消 Web 请求的线程
我正在编写一个 Web 应用程序，允许用户通过 http Web 请求下载大文件。我需要为他们提供取消请求的选项，因此我为该请求创建一个线程。但是，当下载发生时，我仍然无法触发取消事件。我做错了什么？ 感谢您的任何意见！
public class downloadThread {
public int isResume;
public void downloadImage()
{ }
}
protected void btnDownload_Click(object sender, EventArgs e)
{ var x = new downloadThread();
x.isResume = 0;
tRequest = new Thread(new ThreadStart(x.downloadImage));
tRequest.Start();
while (tRequest.IsAlive)
{
DownloadImage(); //this is where the rest request happens
} }
protected void btnCancelRequest_Click(object sender, EventArgs e)
{
if (tRequest != null && tRequest.IsAlive)
{
tRequest.Abort();
}
}
I'm writing a web app that allows users to download large files over http web request. I need to give them the option to cancel the request, so I create a thread for the request. But, while the download is happening, I still can't get the cancel event to fire. What am I doing wrong?
Thanks for any input!
public class downloadThread {
public int isResume;
public void downloadImage()
{ }
}
protected void btnDownload_Click(object sender, EventArgs e)
{ var x = new downloadThread();
x.isResume = 0;
tRequest = new Thread(new ThreadStart(x.downloadImage));
tRequest.Start();
while (tRequest.IsAlive)
{
DownloadImage(); //this is where the rest request happens
} }
protected void btnCancelRequest_Click(object sender, EventArgs e)
{
if (tRequest != null && tRequest.IsAlive)
{
tRequest.Abort();
}
}
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评论（1）
使用 thread.Abort 中止线程可能不是您想要的方式。
在 DownloadImage 方法中使用异步 Web 请求怎么样？ （请参阅 http://msdn.microsoft.com/en -us/library/system.net.httpwebrequest.begingetresponse.aspx ）。这样您就可以调用 Web 请求的 .Abort 方法，而不是中止线程。
Aborting a thread with thread.Abort is maybe not the way you want to do this.
How about an asynchronous web request in your DownloadImage method instead? (See http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.begingetresponse.aspx ). That way you can call the web request's .Abort method rather than aborting the thread.