C#Post方式2

1、

string url = "ab.asp";
 WebRequest req = WebRequest.Create( uri );
 req.Method = "POST";byte[] postData = System.Text.Encoding.UTF8.GetBytes( "a=avalue&b=bvalue");
req.ContentLength = postData.Length;
 Stream postStream = req.GetRequestStream();
 postStream.Write(postData, 0, postData.Length);
 postStream.Close();WebResponse res = req.GetResponse();
StreamReader reader = new StreamReader( res.GetResponseStream(),System.Text.Encoding.UTF8 );
    
 string html = reader.ReadToEnd();reader.Close();
 res.Close();

你可以将UTF8换成你需要的编码方式
记得加上

using ;
 using System.IO;
 using System.Text;

2、

private void enableProxy()
 { 
 
  WebProxy wp=new WebProxy("10.1.1.9",8080);
  wp.BypassProxyOnLocal=true;
         wp.Credentials=new NetworkCredential("lzh","12345", "DomainName");
    
  GlobalProxySelection.Select =wp;
 }

下面是发送代码（我用来给bbs发贴的）：

this.enableProxy();
  
  System.Text.Encoding  encoder = System.Text.Encoding.GetEncoding("gb2312");
  StringBuilder sb = new StringBuilder();
  sb.Append ("name=");
  sb.Append(HttpUtility.UrlEncode(this.txtName.Text,encoder));
  sb.Append("&content1=");
  sb.Append(HttpUtility.UrlEncode(this.txtContent.Text,encoder));
  sb.Append("&title=");
  sb.Append(HttpUtility.UrlEncode(this.txtTitle.Text,encoder));
  
  byte[] buffer = System.Text.ASCIIEncoding.ASCII.GetBytes(sb.ToString());
   
  StreamReader reader=null;
  try
  { 
 
   HttpWebRequest request= (HttpWebRequest)WebRequest.Create(strURL);
   request.Method ="POST";
   
   request.ContentType = "application/x-www-form-urlencoded";
   request.ContentLength = buffer.Length ;
   Stream s = request.GetRequestStream();
   s.Write(buffer,0,buffer.Length );
   HttpWebResponse response = (HttpWebResponse)request.GetResponse();
   reader= new StreamReader(response.GetResponseStream(),System.Text.Encoding.Default );
  }
  catch(Exception ex)
  { 
 
   MessageBox.Show(ex.ToString());
   return;
  }
  this.txtContent.Text = reader.ReadToEnd();

如果你不通过代理服务器
this.enableProxy();不用调用