Web api

Web api

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  ASP.NET Web API UdaiappaRamachandran NHDN-Nashua .NET/Cloud Computing UG Lead Email: udaiappa@gmail.com Blog: http://cloudycode.wordpress.com
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  Agenda  Introduction toWeb API  Web API Routing  Web API Pipeline  Dependency Injections and Resolvers  Model Binding and Media Formats  Self Hosting  Deploying Web API into cloud  References
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  Introduction to WebAPI  Next iteration of WCF REST  Framework for developing REST Services  Released part of ASP.NET MVC  Uses HTTP protocol  Accessible from wide variety of clients  Http Methods: GET, POST, PUT, DELETE  URLs and Methods
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  Demo: Web APIBasics
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  Web API Routing  Web API Routing very similar to MVC routing  Action determined using the HTTP method not the URI path  Uses “api” in the rout is to avoid collisons with ASP.NET MVC routing.  Adds “Controller” to the controller part of the URL  Default mapping thru global.asax  Additional URL parameters are mapped as action parameters  Explicitly specify the HTTP methods for an action by decorating the action method with HttpGet, HttpPut, HttpPost or HttpDelete attribute  Action can be defined thru AcceptVerbs as a method attributes  Route by Action Name  Override action name by using ActionName attribute  Ignore action by NoAction Attribute
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  Demo: Web APIRouting
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  Filtering  Uses OData specific keywords Directs that related records should be retrieved in the record or collection $expand being retrieved. Specifies an expression or function that must evaluate to ‘true’ for a record to $filter be returned in the collection. $orderby Determines what values are used to order a collection of records. $select Specifies a sub set of properties to return. $skip Sets the number of records to skip before it retrieves records in a collection. $top Determines the maximum number of records to return. Install-Package Microsoft.AspNet.WebApi.OData -Pre
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  Demo: Web APIFiltering
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  Web API Pipeline  Both Request and Response Model have pipeline  Web API has client and server side pipelines  Both Share the common object HttpMessageHandler  HttpRequestMessage  Represents all info about http request such as URL, HTTP Methods and Headers  HttpResponseMessage  Represents all the info about the Http Response such as StatusCode, Success Flag, Original Http Request  HttpMessageHandler  Common for both Request and Response  Most common processing code can be placed here  Ideal for authentication  Two Scopes: Global and Per-Route  Custom Handlers  Inherit DelegatingHandler  Custom code to perform any kind of per request functionality
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  Pipeline Elements
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  Pipeline Elements
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  Demo: Web APIPipeline Demo: Custom Handlers
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  Dependency Resolution  ServiceOriented Architecture for Decoupling the object  IoC: The concept of allowing something outside of system to control it.  Often done thru DI frameworks  Unity  Ninject  Castle Windsor  Structure Map  Spring.net  Autofac  Web API provides a hook for us to wire up the complex dependency
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  Demo: Simple Resolver Demo:Resolve using DI Framework
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  Data Model andMIME types  Returning JSON  Default return format  Good for mobile apps  does not require any special code  Returning XML  No code change  Set the request content type as application/xml  Mime Types:  return virtually anything that can be sent over the web  Inherit from BufferedMediaTypeFormatter  Override key methods  attach media formatter to configuration
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  Demo: Data Model Demo:MIME Types
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  Hosting  IIS     Self Hosting    
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  Demo: Self Hosting
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  Resource  http://cloudycode.wordpress.com  http://www.asp.net/web-api/overview http://code.msdn.microsoft.com/ASPNET-Web-API-Self- Host-30abca12  http://msdn.microsoft.com/en-us/library/gg309461.aspx  http://blogs.msdn.com/b/webdev/archive/2012/08/26/asp- net-web-api-and-httpclient-samples.aspx
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  Q&A