[英]How Can I Use DownloadProgressChangedEventHandler in asp.net mvc?
我有網站,我想用WebClient Class下載文件。
例如,我有網址,我想下載它。 在控制台應用程序中,此方法和代碼正常工作
這是控制台應用程序中的示例代碼:
public void DownloadFile(string sourceUrl, string targetFolder)
{
WebClient downloader = new WebClient();
downloader.Headers.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0)");
downloader.DownloadFileCompleted += new AsyncCompletedEventHandler(Downloader_DownloadFileCompleted);
downloader.DownloadProgressChanged +=
new DownloadProgressChangedEventHandler(Downloader_DownloadProgressChanged);
downloader.DownloadFileAsync(new Uri(sourceUrl.Replace(@"\","")), targetFolder);
while (downloader.IsBusy) { }
}
private void Downloader_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
//Console.Write(e.BytesReceived + " " + e.ProgressPercentage);
Console.Write("%" + e.ProgressPercentage);
}
此示例代碼在控制台應用程序中正常工作
我如何在asp.net mvc應用程序中使用此示例代碼。
對於asp.net mvc它應該喜歡這個(我認為)
public ActionResult DownloadPage()
{
string url = "https://rjmediamusic.com/media/mp3/mp3-256/Mostafa-Yeganeh-Jadeh.mp3";
var downld = new DownloadManager();
downld.DownloadFile(url, @"c:\\temp\1.mp3");
return View();
}
對我來說,事件處理程序方法(Downloader_DownloadProgressChanged)非常重要,因為我想在客戶端創建進度條。
我認為這是最好的方法。 但怎么可以?
您可以通過將此代碼添加到項目中來實現此目的:
public void DownloadFile(string sourceUrl, string targetFolder)
{
WebClient downloader = new WebClient();
downloader.Headers.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0)");
downloader.DownloadFileCompleted += new AsyncCompletedEventHandler(Downloader_DownloadFileCompleted);
downloader.DownloadProgressChanged +=
new DownloadProgressChangedEventHandler(Downloader_DownloadProgressChanged);
downloader.DownloadFileCompleted += new AsyncCompletedEventHandler(Downloader_DownloadFileCompleted);
downloader.DownloadProgressChanged +=
new DownloadProgressChangedEventHandler(Downloader_DownloadProgressChanged);
downloader.DownloadFileAsync(new Uri(sourceUrl.Replace(@"\","")), targetFolder);
while (downloader.IsBusy) { }
}
private void Downloader_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
//Console.Write(e.BytesReceived + " " + e.ProgressPercentage);
Console.Write("%" + e.ProgressPercentage);
}
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