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所以我在学校的程序中使用了一些 POST 请求，它工作正常。我今天回到学校却发现我的代码不再工作了。这是它返回的错误：

System.Configuration.ConfigurationErrorsException: Error creating the Web Proxy specified in the 'system.net/defaultProxy' configuration section. ---> System.Net.Sockets.SocketException: An invalid argument was supplied
   at System.Net.NetworkAddressChangePolled..ctor()
   at System.Net.AutoWebProxyScriptEngine.AutoDetector.Initialize()
   at System.Net.AutoWebProxyScriptEngine..ctor(WebProxy proxy, Boolean useRegistry)
   at System.Net.WebProxy.UnsafeUpdateFromRegistry()
   at System.Net.Configuration.DefaultProxySectionInternal..ctor(DefaultProxySection section)
   at System.Net.Configuration.DefaultProxySectionInternal.GetSection()
   --- End of inner exception stack trace ---
   at System.Net.Configuration.DefaultProxySectionInternal.GetSection()
   at System.Net.WebRequest.get_InternalDefaultWebProxy()
   at System.Net.HttpWebRequest..ctor(Uri uri, ServicePoint servicePoint)
   at System.Net.HttpRequestCreator.Create(Uri Uri)
   at System.Net.WebRequest.Create(Uri requestUri, Boolean useUriBase)
   at FileFriend.Net.POST(String url, String dataP)

这是我的邮政编码：

    public static String POST(string url, string dataP)
    {
        string responseString;

        try
        {
            HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(@url) as HttpWebRequest;
            ASCIIEncoding encoding = new ASCIIEncoding();
            string postData = dataP;

            byte[] data = encoding.GetBytes(postData);

            httpWReq.Method = "POST";
            httpWReq.ContentType = "application/x-www-form-urlencoded";
            httpWReq.ContentLength = data.Length;

            using (Stream stream = httpWReq.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            HttpWebResponse response = (HttpWebResponse)httpWReq.GetResponse();

            responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
        }
        catch (Exception e)
        {
            Clipboard.SetText(e.ToString());
            return e.ToString();
        }

        return responseString;
    }

无法完全弄清楚发生了什么变化。

编辑：

我的 App.config 文件：

<?xml version="1.0"?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
    </startup>
</configuration>
4

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