关于C#提交表单post和get的实现 HttpWebRequest 和ttpebeponse

private void post_Click(object sender, EventArgs e)
{

string html = String.Empty;
HttpWebRequest cnbogs = (HttpWebRequest)System.Net.WebRequest.Create("http://music.baidu.com/");
cnbogs.Accept = "image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/QVOD, application/QVOD, */*";
cnbogs.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MALN; CIBA; InfoPath.2; .NET4.0C; .NET4.0E; Media Center PC 6.0; Tablet PC 2.0; AskTB5.6)";
cnbogs.Method = "Post";
cnbogs.KeepAlive = false;
cnbogs.ContentType = "application/x-www-form-urlencoded";
cnbogs.ProtocolVersion = HttpVersion.Version10;//不设置这个可能为出现连接中断
String content = "key=mm";//参数抓个包吧，如果是post方式提交的 参数要按照它的格式；
Encoding encod = Encoding.UTF8;
byte[] data = encod.GetBytes(content);
cnbogs.ContentLength = data.Length;
Stream stream = cnbogs.GetRequestStream();//以byte流的方式写入
stream.Write(data, 0, data.Length);
stream.Flush();
stream.Close();
HttpWebResponse cnblogsRespone = (HttpWebResponse)cnbogs.GetResponse();
if (cnblogsRespone != null && cnblogsRespone.StatusCode == HttpStatusCode.OK)
{
using (StreamReader sr = new StreamReader(cnblogsRespone.GetResponseStream()))
{
html = sr.ReadToEnd();
}
}
textBox1.Text = html;

}


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  private void get_Click(object sender, EventArgs e)
{
string html = String.Empty;
HttpWebRequest cnbogs = (HttpWebRequest)System.Net.WebRequest.Create("http://www.baidu.com/s?wd=mm");//参数在url中  wd 是百度input标签的名字
cnbogs.Accept = "image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/QVOD, application/QVOD, */*";
cnbogs.UserAgent = "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MALN; CIBA; InfoPath.2; .NET4.0C; .NET4.0E; Media Center PC 6.0; Tablet PC 2.0; AskTB5.6)";
cnbogs.Method = "GET";//默认为get方法 不写也行
cnbogs.KeepAlive = false;
cnbogs.ContentType = "application/x-www-form-urlencoded";
HttpWebResponse cnblogsRespone = (HttpWebResponse)cnbogs.GetResponse();
if (cnblogsRespone != null && cnblogsRespone.StatusCode == HttpStatusCode.OK)
{
using (StreamReader sr = new StreamReader(cnblogsRespone.GetResponseStream()))
{
html = sr.ReadToEnd();
}
}
textBox1.Text = html;

}

最近因为要用到抓取网页的所以研究了下这个。。发现网上好多都不行，总有问题，最后折腾一天还是自己折腾出来的。。发现很奇怪个事。百度无法post。。总会返回错误代码.发现了原来是参数格式不对，我试验了学校的教务网发现post的参数格式，教务是asp.net做的  _viewstate=......&参数, 按照这个格式可以正常提交,所以如果想要以post提交的话抓对应网站的表单包看看格式吧，不行就get提交表单