C# 实现HTTP POST请求与接收响应

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;

namespace HTTP_Request_V1
{
public partial class Http_Post : Form
{
public Http_Post()
{
InitializeComponent();
}

private void btn_Go_Click(object sender, EventArgs e)
{
string postData = "username=" + txt_User.Text + "&password=" + txt_Pwd.Text;
postData += ("&vcode=" + txt_VCode.Text);
byte[] byteArray = System.Text.Encoding.UTF8.GetBytes(postData);
string url = txt_Url.Text;
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(url));
webRequest.Method = "POST";             //POST
webRequest.ContentType = "application/x-www-form-urlencoded";
webRequest.ContentLength = byteArray.Length;
Stream newStream = webRequest.GetRequestStream();
newStream.Write(byteArray, 0, byteArray.Length);
newStream.Close();

HttpWebResponse response = (HttpWebResponse)webRequest.GetResponse();
StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
txt_Response.Text = sr.ReadToEnd();
}

private void Form1_Load(object sender, EventArgs e)
{
txt_Url.Text = "http://fsmd.vicp.net:22279/PHP_001/hello2/index5.php";
txt_User.Text = "Boy";
txt_Pwd.Text = "12345";
txt_VCode.Text = "admin";
}
}
}

index5.php

<?php
header("content-Type: text/html; charset=Utf-8");
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2015/12/5
* Time: 21:37
*/

@$user = $_POST['username'];
@$pass =$_POST['password'];
@$vcode=$_POST['vcode'];
echo "用户名=$user";
echo "|密码=$pass";
echo "|验证码=$vcode";
?>