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I'm beginner at c#
for a project i need to [log on] to a website using an username and password and get some variable data
data in this website changed every 15 minutes
at all i need to list all data in grid and other components int this page
i fount that i must have 2 classes for this reason
using System;
using System.Collections.Specialized;
using System.Net;
using System.Text;
using System.IO;
namespace BaseClassNameSpace.Web.BaseServices
{
/// <summary>
///This base class provides implementation of request
///and response methods during Http Calls.
/// </summary>
public class HttpBaseClass
{
private string UserName;
private string UserPwd;
private string ProxyServer;
private int ProxyPort;
private string Request;
public HttpBaseClass(string HttpUserName,
string HttpUserPwd, string HttpProxyServer,
int HttpProxyPort, string HttpRequest)
{
UserName = HttpUserName;
UserPwd = HttpUserPwd;
ProxyServer = HttpProxyServer;
ProxyPort = HttpProxyPort;
Request = HttpRequest;
}
/// <summary>
/// This method creates secure/non secure web
/// request based on the parameters passed.
/// </summary>
/// <param name="uri"></param>
/// <param name="collHeader">This parameter of type
/// NameValueCollection may contain any extra header
/// elements to be included in this request </param>
/// <param name="RequestMethod">Value can POST OR GET</param>
/// <param name="NwCred">In case of secure request this would be true</param>
/// <returns></returns>
public virtual HttpWebRequest CreateWebRequest(string uri,
NameValueCollection collHeader,
string RequestMethod, bool NwCred)
{
HttpWebRequest webrequest =
(HttpWebRequest) WebRequest.Create(uri);
webrequest.KeepAlive = false;
webrequest.Method = RequestMethod;
int iCount = collHeader.Count;
string key;
string keyvalue;
for (int i=0; i < iCount; i++)
{
key = collHeader.Keys[i];
keyvalue = collHeader[i];
webrequest.Headers.Add(key, keyvalue);
}
webrequest.ContentType = "text/html";
//"application/x-www-form-urlencoded";
if (ProxyServer.Length > 0)
{
webrequest.Proxy = new
WebProxy(ProxyServer,ProxyPort);
}
webrequest.AllowAutoRedirect = false;
if (NwCred)
{
CredentialCache wrCache =
new CredentialCache();
wrCache.Add(new Uri(uri),"Basic",
new NetworkCredential(UserName,UserPwd));
webrequest.Credentials = wrCache;
}
//Remove collection elements
collHeader.Clear();
return webrequest;
}//End of secure CreateWebRequest
/// <summary>
/// This method retreives redirected URL from
/// response header and also passes back
/// any cookie (if there is any)
/// </summary>
/// <param name="webresponse"></param>
/// <param name="Cookie"></param>
/// <returns></returns>
public virtual string GetRedirectURL(HttpWebResponse
webresponse, ref string Cookie)
{
string uri="";
WebHeaderCollection headers = webresponse.Headers;
if ((webresponse.StatusCode == HttpStatusCode.Found) ||
(webresponse.StatusCode == HttpStatusCode.Redirect) ||
(webresponse.StatusCode == HttpStatusCode.Moved) ||
(webresponse.StatusCode == HttpStatusCode.MovedPermanently))
{
// Get redirected uri
uri = headers["Location"] ;
uri = uri.Trim();
}
//Check for any cookies
if (headers["Set-Cookie"] != null)
{
Cookie = headers["Set-Cookie"];
}
// string StartURI = "http:/";
// if (uri.Length > 0 && uri.StartsWith(StartURI)==false)
// {
// uri = StartURI + uri;
// }
return uri;
}//End of GetRedirectURL method
public virtual string GetFinalResponse(string ReUri,
string Cookie, string RequestMethod, bool NwCred)
{
NameValueCollection collHeader =
new NameValueCollection();
if (Cookie.Length > 0)
{
collHeader.Add("Cookie",Cookie);
}
HttpWebRequest webrequest =
CreateWebRequest(ReUri,collHeader,
RequestMethod, NwCred);
BuildReqStream(ref webrequest);
HttpWebResponse webresponse;
webresponse = (HttpWebResponse)webrequest.GetResponse();
Encoding enc = System.Text.Encoding.GetEncoding(1252);
StreamReader loResponseStream = new
StreamReader(webresponse.GetResponseStream(),enc);
string Response = loResponseStream.ReadToEnd();
loResponseStream.Close();
webresponse.Close();
return Response;
}
private void BuildReqStream(ref HttpWebRequest webrequest)
//This method build the request stream for WebRequest
{
byte[] bytes = Encoding.ASCII.GetBytes(Request);
webrequest.ContentLength=bytes.Length;
Stream oStreamOut = webrequest.GetRequestStream();
oStreamOut.Write(bytes,0,bytes.Length);
oStreamOut.Close();
}
}
}//End of HttpBaseClass class
using System;
using System.Collections.Specialized;
using System.Net;
using System.Text;
using System.IO;
using BaseClassNameSpace.Web.BaseServices;
namespace DeriveClassNameSpace.Services.Web
{
public class HttpRequestResponse
{
private string URI;
private string Request;
private string UserName;
private string UserPwd;
private string ProxyServer;
private int ProxyPort;
private string RequestMethod = "GET";
public HttpRequestResponse(string pRequest,
string pURI)//Constructor
{
Request = pRequest;
URI = pURI;
}
public string HTTP_USER_NAME
{
get
{
return UserName;
}
set
{
UserName = value;
}
}
public string HTTP_USER_PASSWORD
{
get
{
return UserPwd;
}
set
{
UserPwd = value;
}
}
public string PROXY_SERVER
{
get
{
return ProxyServer;
}
set
{
ProxyServer = value;
}
}
public int PROXY_PORT
{
get
{
return ProxyPort;
}
set
{
ProxyPort = value;
}
}
public string SendRequest()
/*This public interface receives the request
and send the response of type string. */
{
string FinalResponse="";
string Cookie="";
NameValueCollection collHeader = new NameValueCollection();
HttpWebResponse webresponse;
HttpBaseClass BaseHttp = new
HttpBaseClass(UserName,UserPwd,
ProxyServer,ProxyPort,Request);
try
{
HttpWebRequest webrequest =
BaseHttp.CreateWebRequest(URI,
collHeader, RequestMethod, true);
webresponse =
(HttpWebResponse)webrequest.GetResponse();
string ReUri =
BaseHttp.GetRedirectURL(webresponse,
ref Cookie);
//Check if there is any redirected URI.
webresponse.Close();
ReUri = ReUri.Trim();
if (ReUri.Length == 0) //No redirection URI
{
ReUri = URI;
}
RequestMethod="POST";
FinalResponse = BaseHttp.GetFinalResponse(ReUri,
Cookie, RequestMethod, true);
}//End of Try Block
catch (WebException e)
{
throw CatchHttpExceptions(FinalResponse = e.Message);
}
catch (System.Exception e)
{
throw new Exception(FinalResponse = e.Message);
}
finally
{
BaseHttp=null;
}
return FinalResponse;
} //End of SendRequestTo method
private WebException CatchHttpExceptions(string ErrMsg)
{
ErrMsg = "Error During Web Interface. Error is: "+ErrMsg ;
return new WebException(ErrMsg);
}
}//End of RequestResponse Class
}
now i dont know how to send request and get data from a website in my windows application
somebody can help me
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