Archive for the 'Webservices' Category
Impersonation and Delegation in WCF
| Impersonation is a technique that WCF Services use to authorize the caller’s identity to access to service resources such as files and database tables. Service resources can be located either on local service machine or remotely hosted. The resources are being accessed by WCF Service’s process identity or specific windows identity. |  |
Difference between Impersonation and Delegation in WCF?
Impersonation is used to access the resources when the resources are on the same machine as the service. Delegation is used to access the resources that are remotely hosted.
There are two types of Impersonation in WCF
- Imperative Impersonation – Perform programmatically at run time
- Declarative Impersonation – Applied with a static attribute which associated with an operation.
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1 commentHow to choose right WCF binding?
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Binding in WCF defines how clients can connect with your service. The base class for all bindings in WCF is System.ServiceModel.Channels.Binding. A Binding includes definition for WS-* protocols used, the message encoding and the transport protocol. The available WCF Bindings are
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1 commentTransport and Message Security in WCF
This post discusses about transport and message security. In Transport Security user credentials and claims are passed using transport layer. The transport protocols are TCP, HTTP, MSMQ and IPC. Each of these protocols have their own mechanism for passing user credentials. The most common approach is using secure socket layer(SSL) for encrypting the details which sent over HTTPS.
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No commentsWCF 4.5 Features
This post discusses the new features in WCF 4.5. There have been significant improvements in WCF 4.5 on configuration.
Simplifying the generated configuration file in client
| A client configuration file is generated when you add a service reference in Visual Studio 2010. The configuration files in earlier version of WCF contained the value of every binding property even if it is a default value. In WCF 4.5 Configuration files contain binding properties that are set to non-default value. | |
Example of configuration file generated by WCF 3.0
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No commentsWebSockets in ASP.NET 4.5
This post discuss about using WebSockets in ASP.NET 4.5. You can read this post to get an understanding about WebSockets. This post shows piece of code which uses WebSockets in ASP.NET 4.5 and the code is related to simple chat application.
The HTML of Web Form chat application looks as below
It contains a text box where you can type your text message and button where it sends a message to the server. You can notice there is <ul> element which shows the list of other messages which are arriving from the server.
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No commentsWCF Services in Windows Azure
| What is Windows Azure? Windows Azure provides developers computation power storage and can scale web applications on internet through Microsoft Datacenters. Developers can use Azure platform to build WCF service application using their existing Visual Studio 2010 expertise. |  |
Windows Azure supports the protocols and formats including SOAP, REST and XML. This post discuss about creating a simple WCF Service and hosting it on Windows Azure and consuming in client application.
1. Create a WCF Service Contract in Windows Class Library project as shown below which in-turn you use in Web role, worker role and in client application. Read more about roles in windows Azure here
1: using System;
2: using System.ServiceModel;
3: namespace WCFContract
4: {
5: [ServiceContract]
6: public interface IContract
7: {
8: // This operating returns the server information, including
9: // the role's name and instance id
10: [OperationContract]
11: string GetRoleInfo();
12:
13: // This operation returns the information of the channel
14: // being used between the client & the server.
15: [OperationContract]
16: string GetCommunicationChannel();
17: }
18: }
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1 commentWCF Service using MTOM in .NET FW 4
Web services having a greater interoperability to communicate messages across heterogeneous systems, however challenge is serializing the data into XML. Users may want to send images,videos, drawings, xml documents etc. together with SOAP message.
What is MTOM?
Message Transmission Optimization Mechanism (MTOM) is a mechanism of transferring transferring large amounts binary data as an attachment to SOAP message.
Typical SOAP message transmission shown in the below image
Image Source crosscheknet.com
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1 commentWCF Service using ASP.NET AJAX Library
More often, the data to shown in an AJAX page is retrieved from the Web server using a Web service, a Windows Communication Foundation (WCF) service. The services that can also return JavaScriptObjectNotation(JSON) are potential candidates for AJAX pages.
This post explains about calling a WCF service using ASP.NET AJAX Library Data View control. The following are the steps to create and call the service using ASP.NET AJAX Library.
1. Creating a AJAX enabled WCF service
2. Loading the required scripts
3. Calling a service using ASP.NET AJAX Data View Control
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1 commentREST and SOAP
Which is better SOAP or REST? One of the most common discussions. Both REST and SOAP are different approaches in writing the service oriented applications. REST is an architectural style for building client-server applications. SOAP is a protocol for exchanging data between two endpoints.
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1 comment.NET Access Control Service
My previous article explained the basics of building windows azure services. Let’s start looking at the .NET Access Control Service. .NET Access Control Service allows you to use the authentication and authorization services from external sources that are maintained by security experts. Security experts control the authentication and issue the token to the application. Application just uses those tokens by avoiding the authentication process.
