在通用应用程序中使用 POST 方法发送登录数据

Question

我在 windows 应用商店工作，我正在尝试发送登录名和密码值，这是我的代码：

 try
        {
            string user = login.Text;
            string pass = password.Password;

            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = "login=" + user + "&mdp=" + pass;
            byte[] data = encoding.GetBytes(postData);

            WebRequest request = WebRequest.Create("myURL/login.php");
            request.Method = "POST";

            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;

            Stream stream = request.GetRequestStream();
            stream.Write(data, 0, data.Length);
            stream.Dispose();

            WebResponse response = request.GetResponse();
            stream = response.GetResponseStream();

            StreamReader sr = new StreamReader(stream);


            sr.Dispose();
            stream.Dispose();


        }
        catch (Exception ex)
        {
            ex.Message.ToString();
        }

我有很多这样的错误：

'WebRequest' does not contain a definition for 'Content Length' and no extension method 'ContentLength' accepting a first argument of type 'WebRequest' was found (a using directive or an assembly reference is she missing ?)
'WebRequest' does not contain a definition for 'GetRequestStream' and no extension method 'GetRequestStream' accepting a first argument of type 'WebRequest' was found (a using directive or an assembly reference is she missing? )
'WebRequest' does not contain a definition for 'GetResponse' and no extension method 'GetResponse' accepting a first argument of type 'WebRequest' was found (a using directive or an assembly reference is she missing? )

我是通用 windows 应用程序的新手，请问您是否知道如何更正我的代码以将登录数据发送到服务器感谢帮助

Answer 1

如您所见，WebRequest class in .NET Core is a little bit different than traditional .NET. First of all, I suggest you to look at the HttpClient class 这是 UWP 中使用 HTTP 的默认值 class。

如果要使用 WebRequest，为了设置 Content-Length header，请使用 Headers 属性:

request.Headers["ContentLength"] = length;

为了获取请求和响应流，您需要使用 async 方法、GetRequestStreamAsync 和 GetResponseAsync。同步方法不可用。

您的代码最终将如下所示：

string user = login.Text;
string user = login.Text;
string pass = password.Password;

ASCIIEncoding encoding = new ASCIIEncoding();
string postData = "login=" + user + "&mdp=" + pass;
byte[] data = encoding.GetBytes(postData);

WebRequest request = WebRequest.Create("myURL/login.php");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.Headers["ContentLength"] = data.Length.ToString();

using (Stream stream = await request.GetRequestStreamAsync()) {
   stream.Write(data, 0, data.Length);
}

using (WebResponse response = await request.GetResponseAsync()) {
   using (Stream stream = response.GetResponseStream()) {
      using (StreamReader sr = new StreamReader(stream)) {
         //
     }
   }
}

在通用应用程序中使用 POST 方法发送登录数据

send login data with POST method in a universal app

c#

win-universal-app

windows-10-universal