Download pdf programmatically

问题

How can I download a PDF and store to disk using vb.NET or C#?

The URL (of the PDF) has some rediection going on before the final PDF is reached.

I tried the below but the PDF seems corrupted when I attempt to open locally,

Dim PdfFile As FileStream = File.OpenWrite(saveTo)
Dim PdfStream As MemoryStream = GetFileStream(pdfURL)
PdfStream.WriteTo(PdfFile)
PdfStream.Flush()
PdfStream.Close()
PdfFile.Flush()
PdfFile.Close()

回答1:

You can try to use the WebClient (System.Net namespace) class to do this which will avoid any stream work on your side.

The following C# code grabs an IRS form and saves it to C:\Temp.pdf.

using(WebClient client = new WebClient())
{
    client.DownloadFile("http://www.irs.gov/pub/irs-pdf/fw4.pdf", @"C:\Temp.pdf");
}

回答2:

You can also try the following code sample to download pdf files

 Response.ContentType = "Application/pdf"; 
 Response.AppendHeader("Content-Disposition", "attachment; filename=Test_PDF.pdf"); 
 Response.TransmitFile(Server.MapPath("~/Files/Test_PDF.pdf")); 
 Response.End(); 

来源：https://stackoverflow.com/questions/2913830/download-pdf-programmatically