why begin invoke showing error in windows phone 8.1 xmpp connection to openfire

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hai all please help me am trying to connect my app with openfire server here.
[ignore my button click event]
im having trouble in:

1. Thread.Sleep(2000); //the name thread does not exist in the current context

2.this.Dispatcher.BeginInvoke(() =>//error! windows.ui.core.core dispatcher
//doesnot contains the definition for begin invoke and no extension methode
//'begin invoke accepting a first argument type windows.ui.core.coredispatcher'
{ //coul be found( are you missing a using directive or assembly refference?)

<pre>my code:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Net.XMPP;
using System.Threading;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=391641

namespace chat_tral
{
/// &lt;summary&gt;
/// An empty page that can be used on its own or navigated to within a Frame.
/// &lt;/summary&gt;
public sealed partial class MainPage : Page
{

/// &lt;summary&gt;
/// Xmpp Client
/// &lt;/summary&gt;
public XMPPClient ObjXmppClient { get; set; }

/// &lt;summary&gt;
/// XMPP Connection
/// &lt;/summary&gt;
public XMPPConnection ObjXmppCon { get; set; }
public string username;
public string password;
public readonly string server = "taurus";
private Boolean IsXmppSuccess { get; set; }

public MainPage()
{
this.InitializeComponent();

this.NavigationCacheMode = NavigationCacheMode.Required;
}

private void IsXmppValid()
{
ObjXmppClient = new XMPPClient();
//initializing the xmpp client with credentials
ObjXmppClient.JID = username + "@" + server;
ObjXmppClient.Password = password ;
ObjXmppClient.Server = server; //user server for emulator and ip address for device.
ObjXmppClient.AutoReconnect = true;
ObjXmppClient.RetrieveRoster = true;
ObjXmppClient.PresenceStatus = new PresenceStatus() { PresenceType = PresenceType.available, IsOnline = true };
ObjXmppClient.AutoAcceptPresenceSubscribe = true;
ObjXmppClient.AttemptReconnectOnBadPing = true;
XMPPConnection ObjXmppCon = new XMPPConnection(ObjXmppClient);
ObjXmppCon.Connect();
ObjXmppClient.Connect();

//initializing the xmpp connection

ObjXmppCon.OnAsyncConnectFinished += ObjXmppCon_OnAsyncConnectFinished;
ObjXmppClient.OnStateChanged += new EventHandler(xMPPClient_OnStateChanged);

Thread.Sleep(2000); //the name thread does not exist in the current context

}

void ObjXmppCon_OnAsyncConnectFinished(xmedianet.socketserver.SocketClient client, bool bSuccess, string strErrors)
{
IsXmppSuccess = client.Connected;
}

void xMPPClient_OnStateChanged(object sender, EventArgs e)
{
switch (ObjXmppClient.XMPPState)
{
case XMPPState.Ready:
if (IsXmppSuccess)
{

this.Dispatcher.BeginInvoke(() =&gt;//error! windows.ui.core.core dispatcher
//doesnot contains the definition for begin invoke and no extension methode
//'begin invoke accepting a first argument type windows.ui.core.coredispatcher'
{ //coul be found( are you missing a using directive or assembly refference?)

NavigationService.Navigate((new Uri("/Output.xaml?key=success", UriKind.Relative)));
//return;
});
}
else
{

this.Dispatcher.BeginInvoke(() =&gt;//error! windows.ui.core.core dispatcher
//doesnot contains the definition for begin invoke and no extension methode
//'begin invoke accepting a first argument type windows.ui.core.coredispatcher'
//coul be found( are you missing a using directive or assembly refference?)
{
MessageBox.Show("Check server name/IpAddress");
//NavigationService.Navigate((new Uri("/Output.xaml?key=failed", UriKind.Relative)));
return;
});
}
break;

case XMPPState.AuthenticationFailed: this.Dispatcher.BeginInvoke(() =&gt; //error! windows.ui.core.core dispatcher
//doesnot contains the definition for begin invoke and no extension methode
//'begin invoke accepting a first argument type windows.ui.core.coredispatcher'
//coul be found( are you missing a using directive or assembly refference?)
{
MessageBox.Show("Enter valid username and password");
//NavigationService.Navigate((new Uri("/Output.xaml?key=wrong", UriKind.Relative)));
return;

}); break;
}
}

protected override void OnNavigatedTo(NavigationEventArgs e)
{

}

private void Button_Click(object sender, RoutedEventArgs e)
{

}
}
}</pre></pre>

Posted 24-Sep-15 1:50am

Manidas Payyoli

Updated 24-Sep-15 1:53am

v2

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Sergey Alexandrovich Kryukov · Accepted Answer · 2015-09-24T17:43:00

Solution 1

This is simple, but it would take long time to explain all the detail, so here is an example for you:

Suppose you have some code like

C#

void MyFunction(A a, B b, C c) {/* ... */}
//...
A aValue = //...
B bValue = //...
C cValue = //...
MyFunction(aValue, bValue, cValue);

How to delegate it to the UI thread with this.Dispatcher.BeginInvoke? You should pass a delegate instance of appropriate delegate type, followed by the set of parameters to be passed to the delegate instance. This is how:

C#

this.Dispatcher.BeginInvoke(new System.Action<A, B, C>((a, b, c)=>{
   // some code using a, b and c
}), aValue, bValue, cValue);

Method BeginInvoke will pass aValue, bValue and cValue — actual parameters — to the invocation of the delegate instance as the parameters a, b and c. Note, that in this form of delegate description, the compiler uses type inference. I suggest you learn how it works and analyze the role of all types (Action, delegate type, delegate instance object type and so on) by yourself.

—SA

Posted 24-Sep-15 17:43pm

Sergey Alexandrovich Kryukov

Comments

[no name] 25-Sep-15 0:12am

thanks a lot...and why my thread.sleep doesnt work? i added using system.thread

Sergey Alexandrovich Kryukov 25-Sep-15 9:08am

You are welcome.

It always works. The full naming is: System.Threading.Thread.Sleep(/*...*/) (This is a static method; it puts in a wait state the thread calling it.)

Or use "using System.Threading" or, say "using Thread = System.Threading.Thread". It's NOT "using system.thread" (what it would supposed to mean? :-) Read about namespaces; this a very simple topic.

Will you accept the answer formally now?

—SA

[no name] 28-Sep-15 8:09am

yup..vote of thanks

Sergey Alexandrovich Kryukov 28-Sep-15 11:55am

You are very welcome.
Good luck, call again.
—SA

[no name] 29-Sep-15 0:45am

now i am getting this error
Error 1 The type 'System.Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. C:\Users\Taurus2\Desktop\sree\xmpp_sample\agsxmpp_demo\agsxmpp_demo\App.xaml.cs 26 33 agsxmpp_demo

Sergey Alexandrovich Kryukov 29-Sep-15 14:21pm

I have no idea why did you decide to remove that main reference. Don't do it.
—SA

[no name] 29-Sep-15 0:46am

but when i added this reference ,this one is not support in metro apps
what shuld i do?

Sergey Alexandrovich Kryukov 29-Sep-15 14:23pm

This is unrelated to your question. Perhaps you screwed up something; retrieve the version which worked from your revision control system and start over.
—SA