WEBAPI2 official website Study record---Media formatters

The Web API is built in to support the MIME type of XML, JSON, BSON, and form-urlencoded.

Create a custom MIME type to inherit one of the following classes:

• Mediatypeformatter This class uses asynchronous read/write methods
• Bufferedmediatypeformatter This class inherits from Mediatypeformatter, but it uses synchronous read/write methods

Customize a MIME type, as follows:

   Public classProductcsvformatter:bufferedmediatypeformatter { PublicProductcsvformatter () {//Media TypeSupportedmediatypes.add (NewMediatypeheadervalue ("Text/csv")); //Supported character setsSupportedencodings.add (Encoding.GetEncoding ("iso-8859-1")); Supportedencodings.add (NewUTF8Encoding (encodershouldemitutf8identifier:false)); }        //indicates which type of formatter can be serialized,         Public Override BOOLcanwritetype (Type type) {//supports serialization of a collection of product objects and product objects            if(Type = =typeof(Product))return true; Else{Type Enumerabletype=typeof(ienumerable<product>); returnenumerabletype.isassignablefrom (type); }        }        //indicates which object can be deserialized         Public Override BOOLcanreadtype (Type type) {//No deserialization is currently required so return false            return false; }        //serializes an object and writes to the stream, and overloads the ReadFromStream method if it supports deserialization         Public Override voidWriteToStream (Type type,Objectvalue, System.IO.Stream writestream, System.Net.Http.HttpContent content) {Encoding effectiveencoding=selectcharacterencoding (content.            Headers); using(varwriter =NewStreamWriter (Writestream, effectiveencoding)) {                varProducts = value asIenumerable<product>; if(Products! =NULL)                {                    foreach(varProductinchProducts )                    {Writeitem (product, writer); }                }                Else                {                    varSingleproduct = value asProduct; if(Singleproduct = =NULL)                        Throw NewInvalidOperationException ("cannot serialize type");                Writeitem (singleproduct, writer); }            }        }        Private voidWriteitem (product product, StreamWriter writer) {writer. WriteLine ("{0},{1},{2},{3}", Escape (product. ID), Escape (product. Name), Escape (product. Category), Escape (product.        Price)); }        Static Char[] _specialchars =New Char[] {',','\ n','\ r','"' }; Private stringEscape (Objecto) {if(O = =NULL)                return ""; stringfield =o.tostring (); if(field. IndexOfAny (_specialchars)! =-1)            {                returnString.Format ("\ "{0}\"", field. Replace ("\"","\"\"")); }            Else                returnfield; }    } 

  Public Static voidRegister (httpconfiguration config) {//Web API Configuration and Services//Web API RoutingCONFIG.            Maphttpattributeroutes (); Config. Routes.maphttproute (Name:"Defaultapi", Routetemplate:"Api/{controller}/{id}", defaults:New{id =routeparameter.optional}); //to add a custom MIME typeConfig. Formatters.add (NewProductcsvformatter ()); }

to specify Content-type when impersonating a request request

WEBAPI2 official website Study record---Media formatters