C#使用GET、POST请求获取结果

C#使用GET、POST请求获取结果，这里以一个简单的用户登陆为例。

1、 使用GET请求获取结果

1.1 创建LoginHandler.aspx处理页面

protected void Page_Load(object sender, EventArgs e)
{
  string result = "";
  string userName = Request.QueryString["UserName"];
  string password = Request.QueryString["Password"]; 

  if (userName == "admin" && password == "123")
  {
    result = "登陆成功";
  }
  else
  {
    result = "登陆失败";
  }
  Response.Write(result);
}

1.2 编写GET请求与获取结果方法

/// <summary>
/// GET请求与获取结果
/// </summary>
public static string HttpGet(string Url, string postDataStr)
{
  HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url + (postDataStr == "" ? "" : "?") + postDataStr);
  request.Method = "GET";
  request.ContentType = "text/html;charset=UTF-8"; 

  HttpWebResponse response = (HttpWebResponse)request.GetResponse();
  Stream myResponseStream = response.GetResponseStream();
  StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
  string retString = myStreamReader.ReadToEnd();
  myStreamReader.Close();
  myResponseStream.Close(); 

  return retString;
}

1.3 调用测试

static void Main(string[] args)
{
  string url = "http://www.mystudy.cn/LoginHandler.aspx";
  string data = "UserName=admin&Password=123";
  string result = HttpGet(url, data);
  Console.WriteLine(result);
  Console.ReadLine();
}

2、 使用POST请求获取结果

2.1 创建LoginHandler.aspx处理页面

protected void Page_Load(object sender, EventArgs e)
{
  string result = "";
  string userName = Request.Form["UserName"];
  string password = Request.Form["Password"]; 

  if (userName == "admin" && password == "123")
  {
    result = "登陆成功";
  }
  else
  {
    result = "登陆失败";
  }
  Response.Write(result);
}

2.2 编写POST请求与获取结果方法

/// <summary>
/// POST请求与获取结果
/// </summary>
public static string HttpPost(string Url, string postDataStr)
{
  HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
  request.Method = "POST";
  request.ContentType = "application/x-www-form-urlencoded";
  request.ContentLength = postDataStr.Length;
  StreamWriter writer = new StreamWriter(request.GetRequestStream(),Encoding.ASCII);
  writer.Write(postDataStr);
  writer.Flush();
  HttpWebResponse response = (HttpWebResponse)request.GetResponse();
  string encoding = response.ContentEncoding;
  if (encoding == null || encoding.Length < 1) {
    encoding = "UTF-8"; //默认编码
  }
  StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(encoding));
  string retString = reader.ReadToEnd();
  return retString;
}

2.3 调用测试

static void Main(string[] args)
{
  string url = "http://www.mystudy.cn/LoginHandler.aspx";
  string data = "UserName=admin&Password=123";
  string result = HttpPost(url, data);
  Console.WriteLine(result);
  Console.ReadLine();
}

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