C# HttpWebRequest如何使用Post提交网页？

[uestczcs]

请教各位高手，这个网页
http://www.taifex.com.tw/chinese/3/3_1_1.asp?syear=2010&smonth=10&sday=7
如何通过Post的方法修改契约，然后提交，谢谢！
我修改了契约但是得到的页面还是旧的，不知道什么原因。

代码：

String strUrl = @"http://www.taifex.com.tw/chinese/3/3_1_1.asp?syear=2010&smonth=10&sday=7";

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strUrl);

string PostData = @"commodity_idt=CPF";
WriteLogFile(PostData);
byte[] bs = Encoding.ASCII.GetBytes(PostData);

req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;

Stream outStream = req.GetRequestStream();
outStream.Write(bs,0,bs.Length);
outStream.flush();
outStream.Close();

WebResponse myResp = null;
try { //接收HTTP做出的响应
myResp = req.GetResponse();
}
catch(Exception e)
{
int ii =0;
}
Stream ReceiveStream = myResp.GetResponseStream();

StreamReader sReader = new StreamReader(ReceiveStream);
string strContent = sReader.ReadToEnd();

ReceiveStream.Close();
sReader.Close();
myResp.Close();

[以专业开发人员为伍]

搞清楚你的PostData是否只需要这一点东西就足够？！

[wuyq11]

string param = "syear=2010&smonth=10&sday=7";
byte[] bs = Encoding.ASCII.GetBytes(param);
HttpWebRequest req = (HttpWebRequest) HttpWebRequest.Create( "" );
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;

new System.Net.WebClient().DownloadString("");

webbrower试试

[uestczcs]

webbrowser1我用了，很简单方便，但我是想了解下Post的用法，因为有时我会写控制台程序！

[uestczcs]

[Quote=引用 1 楼 sp1234 的回复:]
搞清楚你的PostData是否只需要这一点东西就足够？！
[/Quote]

我不是很熟悉网页， 我只用 string PostData = @"commodity_idt=CPF";是因为在
webbrowser1里面只设置commodity_idt的值，然后invokescript就可以，我最大的疑惑其实
是使用post的时候怎么提交，是自动提交的吗？

[jshi123]

你漏掉了一些参数，补上就可以了

String strUrl = @"http://www.taifex.com.tw/chinese/3/3_1_1.asp?syear=2010&smonth=10&sday=7";

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(strUrl);

string PostData = @"commodity_idt=CPF" +
"&qtype=2" +
"&commodity_id=CPF" +
"&commodity_id2=" +
"&syear=2010" +
"&smonth=10" +
"&sday=7";

WriteLogFile(PostData);
byte[] bs = Encoding.ASCII.GetBytes(PostData);

req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;

Stream outStream = req.GetRequestStream();
outStream.Write(bs,0,bs.Length);
outStream.flush();
outStream.Close();

WebResponse myResp = null;
try { //接收HTTP做出的响应
myResp = req.GetResponse();
}
catch(Exception e)
{
int ii =0;
}
Stream ReceiveStream = myResp.GetResponseStream();

// 注意要用繁体编码接收数据
StreamReader sReader = new StreamReader(ReceiveStream, Encoding.GetEncoding("big5"));
string strContent = sReader.ReadToEnd();

ReceiveStream.Close();
sReader.Close();
myResp.Close();

[uestczcs]

谢谢楼上，果然是参数不全！

[uestczcs]

谢谢楼上，半夜还在辛勤的工作，呵呵！