A simple C # XMLHTTP call

Http://www.cnblogs.com/devsdk/archive/2009/04/11/1433475.html

Using system;
Using system. Collections. Generic;
Using system. text;
Using system. IO;
Using system. net;

Namespace devsdk. Partners. dns_com_cn.sms
{
/// <Summary>
/// Webhttprequest basic class
/// </Summary>
Public class dswebhttprequest
{
/// <Summary>
/// Webhttprequest basic class
/// </Summary>
/// <Param name = "webmethod"> submission method post, get </param>
/// <Param name = "Surl"> submission path </param>
/// <Param name = "webpostdata"> parameter string </param>
/// <Returns> Returns HTML code </returns>
Internal string webhttprequest (string webmethod, string Surl, string webpostdata)
{
Byte [] sdata = encoding. Default. getbytes (webpostdata );

String fstring = "";

# Region "Web instance initialization"
Httpwebrequest webrequest = NULL;

Httpwebresponse webresponse = NULL;

Uri weburl = new uri (Surl );

Stream webstream = NULL;

Streamreader webreader = NULL;
# Endregion

Try
{
Webrequest = (httpwebrequest) webrequest. Create (weburl );

Webrequest. method = webmethod;

Webrequest. contenttype = "application/X-WWW-form-urlencoded ";

Webrequest. contentlength = sdata. length;

Try
{
Webstream = webrequest. getrequeststream ();

Webstream. Write (sdata, 0, sdata. Length );

Webstream. Close ();
}
Catch (ioexception ioex)
{
Throw ioex;
}
Finally
{
Webstream. Close (); webstream. Dispose (); // clear the instance
}

Webresponse = (httpwebresponse) webrequest. getresponse ();

Try
{
Webreader = new streamreader (webresponse. getresponsestream (), encoding. Default );

Fstring = webreader. readtoend ();

Return fstring;
}
Catch (ioexception ioex)
{
Throw ioex;
}
Finally
{
Webreader. Dispose ();
}
}
Catch (httplistenerexception httpex)
{
Throw httpex;
}
Finally
{
# Region "clear instance objects"
Webstream. Dispose ();
Webreader. Dispose ();
# Endregion
}
}

/// <Summary>
/// Security string Filtering
/// </Summary>
/// <Param name = "fstring"> unsafe string </param>
/// <Returns> Security string </returns>
Internal string htmlsqlencodes (string fstring)
{
String tempstr = "";
For (INT I = 0; I <fstring. length; I ++)
{
If (char. isnumber (fstring, I ))
{
Tempstr + = fstring. substring (I, 1 );
}
}
Return tempstr;
}

/// <Summary>
/// 32-bit MD5 Encryption
/// </Summary>
/// <Param name = "sstring"> string to be encrypted </param>
/// <Returns> encrypted string </returns>
Internal string MD5 (string sstring)
{
Byte [] DATA = system. Text. utf8encoding. utf8.getbytes (sstring );

System. Security. cryptography. MD5 MD5 = new system. Security. cryptography. md5cryptoserviceprovider ();

Byte [] result = md5.computehash (data );

Return bitconverter. tostring (result). Replace ("-","");
}
}
}