.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

RestFul Services for CallBack(Duplex communication)

Posted By:      Posted Date: October 27, 2010    Points: 0   Category :WCF


I am able to implementing restful wcf service but now i want to use callback with it.Is it possible ?As i am getting some errors can anyone provide any Link for Restful WCF service callback.



View Complete Post

More Related Resource Links

Robotics: Writing and Testing VPL Services for Serial Communication


VPL, part of Robotics Developer Studio is intended for novice programmers, but is also useful for testing and prototyping. We write a simple serial port service that allows you to send and receive data.

Trevor Taylor

MSDN Magazine February 2010

Foundations: Workflow Services for Local Communication


This month's column describes how to use WCF for communication between a workflow and a host application in Windows Workflow Foundation 3. This knowledge should help developers with their efforts using WF3 and prepare them for WF4, where WCF is the only abstraction over queues (referred to as "bookmarks" in WF4) that ships with the framework.

Matthew Milner

MSDN Magazine November 2009

Contract-First Web Services: Schema-based Development with Windows Communication Foundation


Schema- first contract-first modeling of Web Services gives you the ability to model your contracts with an XML-centric mindset. This process keeps you focused on universally acceptable types and the hierarchical data structures that can be represented in XML.

Christian Weyer, Buddhike de Silva

MSDN Magazine October 2009

RESTful XHTML: RESTful Services With ASP.NET MVC


This article describes how to use XHTML and ASP.NET MVC to implement REST services.

Aaron Skonnard

MSDN Magazine July 2009

Service Station: An Introduction To RESTful Services With WCF


We discuss some of the basic tenets of REST as well as present an implementation of a RESTful service using WCF.

Jon Flanders

MSDN Magazine January 2009

Duplex communication and calling clients from outside the hosted service

Hey,   I am currently building an interface between two applications: One that hosts a WCF service and receives external input (e.g. from a sensory system) and another which subscribes to updates sent by the first.   It is quite easy to call back to the client if I create a ServiceHost and provide it with an instance of my service (using ServiceHost.SingletonInstance). However, if I use a PerSession instance mode, how is it possible to call the clients when I receive an updated from the external sensory system?   Thank you for your time!   Cheers, Till

Two different services, same callback contract

I have two different service using the same callback contract.  Is that permitted?  I am getting weird behavoior.  When a client subscribes to the two callbacks, the messages seem to come back to the wrong callback.Batman

WCF Duplex Communication



   I have a question on duplex communication. When we request a from a client to the service and if the service do not respond back to the client with in the timeout period. The communication between client and service will be broken. Then how can i make the client to continue the communication with the service. Please help me how can i handle this type of situations.

Thanks in Advance.

Full duplex pc to half duplex serial communication with SerialPort class in C++ (but any language wi


Hello.  I am a bit new to the .NET environment, and though I feel I was able to get a good handle on most of the basics of .NET, I believe I've encountered a problem beyond the basics.  I am trying to talk with a device called a ColorPAL that uses asynchronous serial communication, but it is half-duplex instead of full-duplex.  I am able to send it the hex string commands that it wants just fine with the TX line.  However, I find myself unable to read because the RX isn't connected to anything.  Basically what I want to do is that I want to be able to swap the TX line to become a RX line so that I can then read line of the half-duplex.  I read that there is a PinChanged event, so it lead me to believe there is a way to change pins??   If the RX line is very high impedance I could connect it to the TX line, but I have no idea about that.


How can I get a full duplex to read a half-duplex using the visual studio software?


Here is the code I'm using, in case that helps.

#include "stdafx.h"
#include <Windows.h>

using namespace System;
using namespace 

.NET Serial/COM Port Communication over Terminal Services



I hope I'll be able to clearly formulate my question.

Scenario: we have an application that integrates with several type of scanners (i.e. credit card, barcode, passport) using serial port interface.
It's the desktop application and can be deployed to run either in stand-alone environment or can be published over terminal services layer (citrix, TS, etc).
In the preferences of the application users are able to specify which scanner is assigned to which COM port.
For example: bar code scanner = COM1, credit card scanner = COM5.
To a user, names of the COM ports don't really make much sense and they won't know that the bar code scanner needs to be assigned to COM1 unless they go to Device Manager and look up the device name associated with the COM port under Ports (COM & LPT) section.

SerialPort class in .NET Framework has the function GetPortNames that returns the list of available COM ports: COM1, COM3, COM5, COM6, etc.
After doing a little research I found a way to get the descriptive names of each COM port device using WMI.

Here is the code for this:

  Public Shared Function GetAvailableSerialPorts(

Cross domain javascript callback is not supported in authenticated services.


i am getting following errors to run WCF 4.0 web services.

Cross domain javascript callback is not supported in authenticated services.

after commenting following lines in web.config file now wcf project is working fine. what is the wrong in my side.


        <standardEndpoint name="" helpEnabled="true" automaticFormatSelectionEnabled="false" maxReceivedMessageSize="2147483647" crossDomainScriptAccessEnabled="true" />

Is wsHttpBinding supports Restful services in WCF ?



One my architect in our company said that we can create Restful services using wsHttpBinding. Up to my knowledge i know only webHttpBinding is supports Restful services in WCF.

Is my architect was correct ? if yes,I need to know is any other process to make Restful services using wsHttpBinding.

Thanks in advance.........


Request Error for WCF Restful Services


I see some request error after i deployed my WCF service to my dev server.

Request Error

The server encountered an error processing the request. See server logs for more details.


This is what i used in service.svc

Factory = "System.ServiceModel.Activation.WebServiceHostFactory" but i got this request error....


The complete web.config file i've now is

<?xml version="1.0" encoding="UTF-8"?>
    <compilation debug="true">
    <serviceHostingEnvironment aspNetCompatibilityEnabled="false">
        <add prefix="http://wdev.xyz.com/Services/xxx/" />

Using RESTful Services - TeamSiteDataContext is not avaliable

I try to create a form that using REST Services to populate a sharepoint list items. I can browse the list via http://myserver/_vti_bin/ListData/mylist. I add Service Reference to my project. The ListData.svc service does find my list. However, when I show data source, I do not see the TeamSiteDataContext entity. I get an error "The type or namespace name 'TeamSiteDataContext" could not be found(are you missing a using directive or an assembly reference?)" after I enter TeamSiteDataContext mySPContext = new TeamSiteDataContext() line in my code. Is something I miss? Any help will be appreciated. Thank you.

WCF Restful Services & Net TCP binding



I have very high level knowledge of Rest. I was little confused when it came to WCF restful services. I have a service which is actaull a intranet service however it gets called from Desktop application as well as from web application. So currently we have WSHttp (for web app)& netTcp(for desktop) binding provisioned. Now if i think about makeing this service Restful will my NetTCP biding still work with this model.

Based on my understanding Rest is more toward Http Api based model so it will not help me for TCP based biding. secondly if at all i have to make this service Rstful what approach i need to follow make this service support NetTcp without code duplication.




Any one please provide sample Example for the Restful Services Using WCF interacting with Database.

Anyone please provide sample Example for the Restful Services Using  WCF interacting with Database.and the request and response formate will be in JSON.

Notify duplex callback from website?


Hi guys.

I'v got a wcf service witch implements a duplex operationcontract, but how do i "invoke" the client's callback from a website (same server/project) at any giving time?

e.g when i web user presses a button og my website, how do i call the callback function for one/all duplex webservice clients?

do i implement a function in the webservices and then create a channel in the website code-behind, or is there some clever way of doing that? also if i would like to pull some information of the webservice from the website?

thanks Mikkel Snitker



ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend