< DOCTYPE html PUBLIC -WCDTD XHTML StrictEN httpwwwworgTRxhtmlDTDxhtml-strictdtd>

我用的是WebClient这个类来做的,如

try

{

WebClient   wc   =   new   WebClient();

wc.Headers.Add( "Content-Type ",   "application/x-www-form-urlencoded ");

wc.Headers.Add( "User-Agent ",   "Mozilla/4.0   (compatible;   MSIE   6.0;   Windows   NT   5.1;.NET   CLR   1.1.4322) ");

wc.Headers.Add( "Accept ",   "*/*) ");

string postStr = "AAA=1&BBB=2 ";

byte [] postData = Encoding.ASCII.GetBytes(postStr);

byte [] returnData = wc.UploadData( "​​http://www.xxxx.com/aaa​​ ", "POST ", postData);

string   returnStr   =   Encoding.GetEncoding( "GB2312 ").GetString(returnData);

MessageBox.Show(returnStr);

}catch(Exception   ex)

{

MessageBox.Show(ex.Message);

}

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