Develop Reference

File download does not start when invoke or execute an URL

If anyone load this url https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06 into browser then a excel file start download. so when i invoke the same url by HttpWebRequest then excel file does not start download. this code example i tried.
string address = "https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06";
using (WebClient client = new WebClient())
{
client.DownloadString(address);
}
again i tried this one too.
string url = "https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06";
WebRequest request = HttpWebRequest.Create(url);
WebResponse response = request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string responseText = reader.ReadToEnd();
but failed to reach my goal. code successfully executed but no excel file start downloading which i am trying to achieve.
when i tried to load this url https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06 into webbrowser control then also saw same problem no excel file start download. here is code which i tried.
webBrowser1.Navigate("https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06");
webBrowser1.ScriptErrorsSuppressed = true;
i just do not understand why excel file is not getting download when invoke or execute the same very url.
so please some one tell me what i need to do as a result the moment i will execute the url excel file will start downloading in client pc.
please share some working code example.

DownloadString returns the contents into a variable aka in memory. A file will not get saved on the system. If that is what you intended, there's a small change you need to make in your code:
string address = "https://de.visiblealpha.com/links/80488d55-ae41-4def-9452-bae3ac2e2b06";
using (WebClient client = new WebClient())
{
string contents = client.DownloadString(address);
}
The variable "contents" will contain html of the URL in your question. If you want it as a file, then I you need to use DownloadFile method instead. The spreadsheet itself is a different URL.
There's an example at the end of this documentation.

c# how to list all files from ftp directory and read each file without downloading [duplicate]

I would like to load an excel file directly from an ftp site into a memory stream. Then I want to open the file in the FarPoint Spread control using the OpenExcel(Stream) method. My issue is I'm not sure if it's possible to download a file directly into memory. Anyone know if this is possible?

Yes, you can download a file from FTP to memory.
I think you can even pass the Stream from the FTP server to be processed by FarPoint.
WebRequest request = FtpWebRequest.Create("ftp://asd.com/file");
using (WebResponse response = request.GetResponse())
{
Stream responseStream = response.GetResponseStream();
OpenExcel(responseStream);
}
Using WebClient you can do nearly the same. Generally using WebClient is easier but gives you less configuration options and control (eg.: No timeout setting).
WebClient wc = new WebClient();
using (MemoryStream stream = new MemoryStream(wc.DownloadData("ftp://asd.com/file")))
{
OpenExcel(stream);
}

Take a look at WebClient.DownloadData. You should be able to download the file directory to memory and not write it to a file first.
This is untested, but something like:
var spreadSheetStream
= new MemoryStream(new WebClient().DownloadData(yourFilePath));
I'm not familiar with FarPoint though, to say whether or not the stream can be used directly with the OpenExcel method. Online examples show the method being used with a FileStream, but I'd assume any kind of Stream would be accepted.

Download file from URL to memory.
My answer does not exactly show, how to download a file for use in Excel, but shows how to create a generic-purpose in-memory byte array.
private static byte[] DownloadFile(string url)
{
byte[] result = null;
using (WebClient webClient = new WebClient())
{
result = webClient.DownloadData(url);
}
return result;
}

How can I get the embed data from PDFviewer page with C# or JS?

I'm creating some test with selenium and C# .I have a window with PDF Viewer, I want to read the HTTP header of this window but the URL that is showing in the window is not what I'm supposed to use to get this data.
Honestly I don't really understand how is encoding and decoding this files. The thing that I want is read the filename to get the file then read it, and be sure that doesn't contain errors.
Some advises or links for understand better HTTP headers, metafiles, how enconde and decode pdf files etc.
Here is some of my code
URL url = new URL(driver.Url);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url.toString());
try
{
HttpWebResponse res = (HttpWebResponse)request.GetResponse();
using (Stream rstream = res.GetResponseStream())
{
string fileName = res.Headers["Content-Disposition"] ;
}
res.Close();
}
catch{
}

How to Get Files From A Directory That's Open for Directory Listing?

Assume that a website has set the directory listing permissions open for one of its folder and I can see files on the web browser[as on the image]. Is there a way to get files in this folder to an array?
In a word, I need to use a method that's doing what DirectoryInfo.GetFiles("C:/"); for an URL.
Edit: I'd rather want to use a method instead of getting web response and parse the result. That's like a back door in case there's not an alternative way.

This code will help you get the html
WebRequest request = WebRequest.Create("http://yourwebsite/yourwebdirectory/");
var webResponse=request.GetResponse();
Stream dataStream = webResponse.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
Console.WriteLine(responseFromServer);
reader.Close();
webResponse.Close();
Once you get the html you can parse it to get the file names

Pass through XML from another website

I am trying to pass through some XML from an external website.
What is the best way of doing this, through c# webpage or asp.MVC?

I tend to use something like this for working with external XML documents / RSS feeds etc:
string sURL = ".....";
// Create a request for the URL.
WebRequest oRequest = WebRequest.Create(sUrl);
// Get the response.
WebResponse oResponse = oRequest.GetResponse();
// Get the stream containing content returned by the server.
Stream oDataStream = oResponse.GetResponseStream();
// Open the stream using a StreamReader for easy access.
StreamReader oReader = new StreamReader(oDataStream, System.Text.Encoding.Default);
// Read the content.
string sXML = oReader.ReadToEnd();
// Convert string to XML
XDocument oFeed = XDocument.Parse(sXML);

Either should be fine. MVC is probably easiest (in terms of getting a raw response), but you could do the same in regular ASP.NET just by using a handler (possibly .ashx), or just by clearing the response.