Exception 显示don'的错误消息;t在c中的webclient中连接internet#
我下载文件的代码是:Exception 显示don'的错误消息;t在c中的webclient中连接internet#,exception,download,webclient,connect,Exception,Download,Webclient,Connect,我下载文件的代码是: private void Completed(object sender, AsyncCompletedEventArgs e) { MessageBox.Show("Download completed!"); } //----------- Download complete Stopwatch sw = new Stopwatch(); private void ProgressChanged(object se
private void Completed(object sender, AsyncCompletedEventArgs e)
{
MessageBox.Show("Download completed!");
}
//----------- Download complete
Stopwatch sw = new Stopwatch();
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{// Calculate download speed and output it to labelSpeed.
lblspeed.Text = string.Format("{0} kb/s", (e.BytesReceived / 1024d / sw.Elapsed.TotalSeconds).ToString("0.00"));
// Update the progressbar percentage only when the value is not the same.
progressBar.Value = e.ProgressPercentage;// Show the percentage on our label.
lblper.Text = e.ProgressPercentage.ToString() + "%";// Update the label with how much data have been downloaded so far and the total size of the file we are currently downloading
lblsize.Text = string.Format("{0} MB’s / {1} MB’s",
(e.BytesReceived / 1024d / 1024d).ToString("0.00"),
(e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00"));
}
public void DownloadFile(string urlAddress, string location)
{
using (WebClient client = new WebClient())
{
client.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);// The variable that will be holding the url address (making sure it starts with http://)
Uri URL = urlAddress.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ? new Uri(urlAddress) : new Uri("http://" + urlAddress);// Start the stopwatch which we will be using to calculate the download speed
sw.Start();
try
{
// Start downloading the file
client.DownloadFileAsync(URL, location);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
当我没有连接到internet并调用DownloadFile
方法时,应用程序消息:下载完成
有什么问题吗?您需要检查下载过程中是否发生错误。大概是这样的:
private void Completed(object sender, AsyncCompletedEventArgs e)
{
if(!e.Cancelled && e.Error == null)
MessageBox.Show("Download completed!");
}