如何使用 URL 链接下载 PDF 文件到 c# 中的本地计算机

Question

I'm trying to download a pdf file using a URL link to my computer, but it gives the following error:

'Unable to connect to the remote server' SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 41.180.70.243:80

I made sure that I can open the PDF in my browser when I use the link, and it works. (I get the link from an XML response from another server).

I am using service references to integrate to another system using SOAP. The result that I get back from the service is a XML file:

TPN_Test_ConsumerService.ConsumerSoapClient consumerServiceClient = new TPN_Test_ConsumerService.ConsumerSoapClient();
var result = consumerServiceClient.ConsumerEnquiry(securityInfo, moduleList, consumerBlock, enquiryBlock);

var PdfURL = "";
XmlDocument doc = new XmlDocument();
doc.LoadXml(Convert.ToString(result));

XmlNodeList elemList = doc.GetElementsByTagName("PdfURL");
for (int i = 0; i < elemList.Count; i++)
{
   PdfURL = elemList[i].InnerXml;
}

WebClient client = new WebClient();
client.Credentials = new NetworkCredential("username", "password");
byte[] pdfBytes = client.DownloadData(PdfURL);
System.IO.File.WriteAllBytes("Path of file", pdfBytes);

I've tried setting the default proxy to false in the web.config file, but that also did not work.

Answer 1

You can download the PDF file and save it in Isolated Storage, to be able to view later offline. So lets see how to do it step-by-step.

1- Download PDF file from a link( URL ) provided by server side:

WebClient client = new WebClient();
client.OpenReadCompleted += client_OpenReadCompleted;
client.OpenReadAsync(new Uri("http://url-to-your-pdf-file.pdf"));

2- Save the downloaded PDF file in local storage:

async void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
    byte[] buffer = new byte[e.Result.Length];
    await e.Result.ReadAsync(buffer, 0, buffer.Length);

    using (IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication())
    {
        using (IsolatedStorageFileStream stream = storageFile.OpenFile("your-file.pdf", FileMode.Create))
        {
            await stream.WriteAsync(buffer, 0, buffer.Length);
        }
    }
}