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作者： unknow

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Web;

class ClientPOST {
public static void Main(string[] args) {

if (args.Length < 1) {
showusage();
} else {
if (args.Length < 2 ) {
getPage(args[0], "s1=foods2=bart(&S)");
} else {
getPage(args[0], args[1]);
}
}

Console.WriteLine();
Console.WriteLine("按任意键继续...");
Console.ReadLine();

return;
}

public static void showusage() {
Console.WriteLine("尝试发送 (POST) 到 URL 中");
Console.WriteLine();
Console.WriteLine("用法：:");
Console.WriteLine("ClientPOST URL [postdata]");
Console.WriteLine();
Console.WriteLine("示例：:");
Console.WriteLine("ClientPOST http://www.microsoft.com s1=food&s2=bart");
}

public static void getPage(String url, String payload) {
WebResponse result = null;

try {

WebRequest req = WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
StringBuilder UrlEncoded = new StringBuilder();
Char[] reserved = {@#?@#, @#=@#, @#&@#};
byte[] SomeBytes = null;

if (payload != null) {
int i=0, j;
while(i<payload.Length){
j=payload.IndexOfAny(reserved, i);
if (j==-1){
UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, payload.Length-i)));
break;
}
UrlEncoded.Append(HttpUtility.UrlEncode(payload.Substring(i, j-i)));
UrlEncoded.Append(payload.Substring(j,1));
i = j+1;
}
SomeBytes = Encoding.UTF8.GetBytes(UrlEncoded.ToString());
req.ContentLength = SomeBytes.Length;
Stream newStream = req.GetRequestStream();
newStream.Write(SomeBytes, 0, SomeBytes.Length);
newStream.Close();
} else {
req.ContentLength = 0;
}


result = req.GetResponse();
Stream ReceiveStream = result.GetResponseStream();
Encoding encode = System.Text.Encoding.GetEncoding("utf-8");
StreamReader sr = new StreamReader( ReceiveStream, encode );
Console.WriteLine("\r\n已接收到响应流");
Char[] read = new Char[256];
int count = sr.Read( read, 0, 256 );
Console.WriteLine("HTML...\r\n");
while (count > 0) {
String str = new String(read, 0, count);
Console.Write(str);
count = sr.Read(read, 0, 256);
}
Console.WriteLine("");
} catch(Exception e) {
Console.WriteLine( e.ToString());
Console.WriteLine("\r\n找不到请求 URI，或者它的格式不正确");
} finally {
if ( result != null ) {
result.Close();
}
}
}
}