WebClient.UploadData (posting, getting session ID and posting again)

  • Thread starter Thread starter Sonnich Jensen
  • Start date Start date
S

Sonnich Jensen

Hi all

This is for an internal system.

A C# app, which needs to login onto a web interface (this works) then read out some reports.
However getting some session ID from the login is new to me, but I need that to continue to open the search page.

Just how do I get that and how do I pass it on?

On the internet I can find some ideas of how to pass it on, but I need get it first

WBR
Sonnich
 
This is for an internal system.

A C# app, which needs to login onto a web interface (this works) then read out some reports.
However getting some session ID from the login is new to me, but I need that to continue to open the search page.

Just how do I get that and how do I pass it on?

On the internet I can find some ideas of how to pass it on, but I need get it first
Click to expand...

With form based authentication and simple setups then the login returns
a session cookie and you just need to send that with the following
requests.

That is simple with (Http)WebRequest, but requires a little trick with
WebClient.

public class WebClientWithCookies : WebClient
{
private CookieContainer cookies = new CookieContainer();
protected override WebRequest GetWebRequest(Uri address)
{
WebRequest res = base.GetWebRequest(address);
if(res != null && res is HttpWebRequest)
{
((HttpWebRequest)res).CookieContainer = cookies;
}
return res;
}
}


Arne
 
With form based authentication and simple setups then the login returns
a session cookie and you just need to send that with the following
requests.
Click to expand...

Note that ASP.NET web forms with view state can be more tricky.

Arne
 
Note that ASP.NET web forms with view state can be more tricky.

Arne
Click to expand...

I can post to the loginpage, and I found out about the __viewstate - I needto post that, then - it somewhat works - but I can get an error for a failed login, but no further action when providing the right password.

I looked into what the viewstate holds of data, and I cannot see that I should change that we reporting it back.

When I try to open the next page, I get a "500 internal server error", which does not tell me that much.... then again it is a part of a frameset (menu + page). I have no idea what that ca do to it. The link from the menu will simply open a page, and I can open it in a new window. Still not from myprogramme

WBR
Sonnich
 
I can post to the loginpage, and I found out about the __viewstate - I need to post that, then - it somewhat works - but I can get an error for a failed login, but no further action when providing the right password.

I looked into what the viewstate holds of data, and I cannot see that I should change that we reporting it back.

When I try to open the next page, I get a "500 internal server error", which does not tell me that much.... then again it is a part of a frameset (menu + page). I have no idea what that ca do to it. The link from the menu will simply open a page, and I can open it in a new window. Still not from my programme
Click to expand...

As I said then it can be very tricky.

I got it to work once by re-POST'ing both __VIEWSTATE and
__EVENTVALIDATION.

Arne
 
Back
Top