私のアプリケーションはユーザー名とパスワードを取得し、ハイパーリンク ボタンをクリックすると、これらの値がサーバーに送信されるため、サーバーは PASS:ClientID のような値を返します。responseString に PASS が含まれている場合にのみ、(MainPage.xaml.cs から) SecondPage.xaml に移動したいと考えています。これが私のコードです：
namespace aquila1
{
public partial class MainPage : PhoneApplicationPage
{
static string username;
static string password;
static string rs;
static NavigationService ns = new NavigationService();
// Constructor
public MainPage()
{
InitializeComponent();
}
private static ManualResetEvent allDone = new ManualResetEvent(true);
private void HyperlinkButton_Click_1(object sender, RoutedEventArgs e)
{
username = textbox1.Text;
password = textbox2.Text;
System.Diagnostics.Debug.WriteLine(username);
System.Diagnostics.Debug.WriteLine(password);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://60.243.245.181/fms_tracking/php/mobile_login.php?username=" + username + "&password=" + password);
request.ContentType = "application/x-www-form-urlencoded";
// Set the Method property to 'POST' to post data to the URI.
request.Method = "POST";
// start the asynchronous operation
request.BeginGetRequestStream(new AsyncCallback(GetRequestStreamCallback), request);
// Keep the main thread from continuing while the asynchronous
// operation completes. A real world application
// could do something useful such as updating its user interface.
allDone.WaitOne();
}
private static void GetRequestStreamCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
Stream postStream = request.EndGetRequestStream(asynchronousResult);
// Console.WriteLine("Please enter the input data to be posted:");
string postData = username + "+" + password;
System.Diagnostics.Debug.WriteLine(postData);
// Convert the string into a byte array.
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Write to the request stream.
postStream.Write(byteArray, 0, postData.Length);
postStream.Close();
// Start the asynchronous operation to get the response
request.BeginGetResponse(new AsyncCallback(GetResponseCallback), request);
}
private static void GetResponseCallback(IAsyncResult asynchronousResult)
{
HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
// End the operation
HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asynchronousResult);
Stream streamResponse = response.GetResponseStream();
StreamReader streamRead = new StreamReader(streamResponse);
string responseString = streamRead.ReadToEnd();
rs = responseString;
System.Diagnostics.Debug.WriteLine(responseString);
System.Diagnostics.Debug.WriteLine("@@@@@");
System.Diagnostics.Debug.WriteLine(rs);
// Close the stream object
streamResponse.Close();
streamRead.Close();
// Release the HttpWebResponse
response.Close();
move2();
allDone.Set();
}
private static void move2()
{
string[] rs1 = rs.Split(':');
if ((rs1[0].Trim()).Equals("PASS"))
{
ns.Navigate(new Uri("/SecondPage.xaml", UriKind.Relative));
}
else
{
MessageBox.Show(rs);
}
}
}
}
コードを実行すると、常に NullReferenceException が発生します。
エラーを見つけて修正を提案するのを手伝ってください。
前もって感謝します