在form1的顶部我做到了：
WebClient Client;
然后在构造函数中：
Client = new WebClient(); Client.DownloadFileCompleted += Client_DownloadFileCompleted; Client.DownloadProgressChanged += Client_DownloadProgressChanged;
然后我有这个方法我打电话每一分钟：
private void fileDownloadRadar()
{
if (Client.IsBusy == true)
{
Client.CancelAsync();
}
else
{
Client.DownloadProgressChanged += Client_DownloadProgressChanged;
Client.DownloadFileAsync(myUri,combinedTemp);
}
}
每一分钟,它每次从网站下载图像.
这是所有工作超过24小时没有问题,直到现在抛出这个例外在下载完成的事件：
private void Client_DownloadFileCompleted(object sender,AsyncCompletedEventArgs e)
{
if (e.Error != null)
{
timer1.Stop();
span = new TimeSpan(0,(int)numericUpDown1.Value,0);
label21.Text = span.ToString(@"mm\:ss");
timer3.Start();
}
else if (!e.Cancelled)
{
label19.ForeColor = Color.Green;
label19.Text = "חיבור האינטרנט והאתר תקינים";
label19.Visible = true;
timer3.Stop();
if (timer1.Enabled != true)
{
if (BeginDownload == true)
{
timer1.Start();
}
}
bool fileok = Bad_File_Testing(combinedTemp);
if (fileok == true)
{
File1 = new Bitmap(combinedTemp);
bool compared = ComparingImages(File1);
if (compared == false)
{
DirectoryInfo dir1 = new DirectoryInfo(sf);
FileInfo[] fi = dir1.GetFiles("*.gif");
last_file = fi[fi.Length - 1].FullName;
string lastFileNumber = last_file.Substring(82,6);
int lastNumber = int.Parse(lastFileNumber);
lastNumber++;
string newFileName = string.Format("radar{0:D6}.gif",lastNumber);
identicalFilesComparison = File_Utility.File_Comparison(combinedTemp,last_file);
if (identicalFilesComparison == false)
{
string newfile = Path.Combine(sf,newFileName);
File.Copy(combinedTemp,newfile);
LastFileIsEmpty();
}
}
if (checkBox2.Checked)
{
simdownloads.SimulateDownloadRadar();
}
}
else
{
File.Delete(combinedTemp);
}
File1.Dispose();
}
}
现在它停在if(e.Error！= null)
就行：timer1.Stop();
at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at System.Net.WebClient.GetWebResponse(WebRequest request,IAsyncResult result) at System.Net.WebClient.DownloadBitsResponseCallback(IAsyncResult result)
我如何解决这个问题呢,不会再发生了？为什么会发生？
编辑：
我尝试将fileDownloadRadar方法更改为每次发布客户端：
private void fileDownloadRadar()
{
using (WebClient client = new WebClient())
{
if (client.IsBusy == true)
{
client.CancelAsync();
}
else
{
client.DownloadFileAsync(myUri,combinedTemp);
}
}
}
问题是在构造函数中,我使用的是客户端,这里是客户端两个不同的Webclient变量.
我如何解决这个和例外？
这是网站的网站油墨,我的图像每分钟下载.
仍然不确定为什么我得到这个例外,它工作没有问题超过24小时.
现在我再次运行该程序,它的工作,但我想知道我是否会再次获得这个例外,或者有时在接下来的几个小时.
解决方法
我和WebClient有同样的问题,在这里找到解决方案：
http://blog.developers.ba/fixing-issue-httpclient-many-automatic-redirections-attempted/
http://blog.developers.ba/fixing-issue-httpclient-many-automatic-redirections-attempted/
使用HttpWebRequest并设置一个CookieContainer来解决问题,例如：
HttpWebRequest webReq = (HttpWebRequest)HttpWebRequest.Create(linkUrl);
try
{
webReq.CookieContainer = new CookieContainer();
webReq.Method = "GET";
using (WebResponse response = webReq.GetResponse())
{
using (Stream stream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(stream);
res = reader.ReadToEnd();
...
}
}
}
catch (Exception ex)
{
...
}
