namespace System.Web.Http.Routing\r\n{\r\n \/\/\r\n \/\/ Summary:\r\n \/\/ Represents a base class route constraint.\r\n public interface IHttpRouteConstraint\r\n {\r\n \/\/\r\n \/\/ Summary:\r\n \/\/ Determines whether this instance equals a specified route.\r\n \/\/\r\n \/\/ Parameters:\r\n \/\/ request:\r\n \/\/ The request.\r\n \/\/\r\n \/\/ route:\r\n \/\/ The route to compare.\r\n \/\/\r\n \/\/ parameterName:\r\n \/\/ The name of the parameter.\r\n \/\/\r\n \/\/ values:\r\n \/\/ A list of parameter values.\r\n \/\/\r\n \/\/ routeDirection:\r\n \/\/ The route direction.\r\n \/\/\r\n \/\/ Returns:\r\n \/\/ True if this instance equals a specified route; otherwise, false.\r\n bool Match(HttpRequestMessage request, IHttpRoute route, string parameterName, IDictionary<string, object> values, HttpRouteDirection routeDirection);\r\n }\r\n}<\/pre>\nDilerseniz bir \u00f6rnek \u00fczerinde IHttpRouteConstraint interface\u2019inin, implementasyonunu ger\u00e7ekle\u015ftirelim. Ger\u00e7ekle\u015ftirecek oldu\u011fumuz \u00f6rnekte HTTP Header\u2019\u0131 kullanarak, controller \u00fczerinde custom olarak versiyonlama i\u015flemi ger\u00e7ekle\u015ftirece\u011fiz.<\/p>\n
\u015eimdi VersionConstraint<\/strong> isminde yeni bir class olu\u015ftural\u0131m ve IHttpRouteConstraint interface\u2019ini a\u015fa\u011f\u0131daki gibi implemente edelim.<\/p>\nusing System.Collections.Generic;\r\nusing System.Linq;\r\nusing System.Net.Http;\r\nusing System.Web.Http.Routing;\r\n\r\nnamespace RoutingExample.Constraints\r\n{\r\n public class VersionConstraint : IHttpRouteConstraint\r\n {\r\n private const int DEFAULT_VERSION = 1;\r\n private int _AllowedVersion;\r\n\r\n public VersionConstraint(int allowedVersion)\r\n {\r\n _AllowedVersion = allowedVersion;\r\n }\r\n\r\n public bool Match(HttpRequestMessage request, IHttpRoute route, string parameterName, IDictionary<string, object> values, HttpRouteDirection routeDirection)\r\n {\r\n if (routeDirection == HttpRouteDirection.UriResolution)\r\n {\r\n int version = GetVersionFromRequestHeader(request) ?? DEFAULT_VERSION;\r\n if (version == _AllowedVersion)\r\n {\r\n return true;\r\n }\r\n }\r\n\r\n return false;\r\n }\r\n\r\n private int? GetVersionFromRequestHeader(HttpRequestMessage request)\r\n {\r\n IEnumerable<string> headerValues;\r\n string val = string.Empty;\r\n\r\n if (request.Headers.TryGetValues(\"api-version\", out headerValues) && headerValues.Count() == 1)\r\n {\r\n val = headerValues.First();\r\n }\r\n\r\n int versionFromHeader;\r\n\r\n if (!string.IsNullOrEmpty(val) && int.TryParse(val, out versionFromHeader))\r\n {\r\n return versionFromHeader;\r\n }\r\n\r\n return null;\r\n }\r\n }\r\n}<\/pre>\nImplementasyona ilk bakt\u0131\u011f\u0131m\u0131zda, constructor arac\u0131l\u0131\u011f\u0131 ile d\u0131\u015far\u0131dan ge\u00e7erli olmas\u0131n\u0131 istedi\u011fimiz \u201callowedVersion\u201d parametresini al\u0131yoruz. IHttpRouteConstraint<\/strong> interface\u2019inden gelen \u201cMatch\u201d method\u2019unda ise; Request\u2019in Header\u2019\u0131 \u00fczerinde custom olarak set edilmi\u015f olan \u201capi-version\u201d bilgisini alarak, constructor \u00fczerinden elde etmi\u015f oldu\u011fumuz \u201callowedVersion\u201d parametresi ile kar\u015f\u0131la\u015ft\u0131r\u0131yoruz.
\nArt\u0131k olu\u015fturmu\u015f oldu\u011fumuz VersionConstraint class\u2019\u0131n\u0131 route belirtirken kullanabilmek i\u00e7in RouteFactoryAttribute<\/strong> abstract class\u2019\u0131ndan yararlanarak, a\u015fa\u011f\u0131daki gibi yeni bir attribute olu\u015ftural\u0131m ve implemente edelim.<\/p>\nusing RoutingExample.Constraints;\r\nusing System;\r\nusing System.Collections.Generic;\r\nusing System.Web.Http.Routing;\r\n\r\nnamespace RoutingExample.Attributes\r\n{\r\n public class VersionedRouteAttribute : RouteFactoryAttribute\r\n {\r\n private int _AllowedVersion;\r\n\r\n public VersionedRouteAttribute(string template, int allowedVersion)\r\n : base(template)\r\n {\r\n _AllowedVersion = allowedVersion;\r\n }\r\n\r\n public override IDictionary<String, Object> Constraints\r\n {\r\n get\r\n {\r\n var constraints = new HttpRouteValueDictionary();\r\n constraints.Add(\"version\", new VersionConstraint(_AllowedVersion));\r\n\r\n return constraints;\r\n }\r\n }\r\n }\r\n}<\/pre>\nImplementasyona bakt\u0131\u011f\u0131m\u0131zda ilk parametrede constructor \u00fczerinden route template\u2019i al\u0131p, RouteFactoryAttribute\u2019\u00fcn construtor\u2019\u0131na ge\u00e7iyoruz. \u0130kinci parametrede ise ge\u00e7erli olmas\u0131n\u0131 istedi\u011fimiz versiyon numaras\u0131n\u0131 alarak, RouteFactoryAttribute \u00fczerinde bulunan Constraints<\/strong> dictionary\u2019sine VersionConstraint\u2019i, ge\u00e7erli olmas\u0131n\u0131 istedi\u011fimiz versiyon numaras\u0131 ile beraber ekliyoruz.<\/p>\nConstraint’imiz haz\u0131r oldu\u011funa g\u00f6re \u015fimdi yeni bir controller olu\u015fturarak kullan\u0131m\u0131na bir bakal\u0131m.<\/p>\n
public class Order_V1Controller : ApiController\r\n{\r\n [VersionedRoute(\"api\/Order\", 1)]\r\n [HttpGet]\r\n public IEnumerable<Order> Get()\r\n {\r\n return null;\r\n }\r\n}<\/pre>\nOrder_V1Controller\u2019a bakt\u0131\u011f\u0131m\u0131zda Get method\u2019u \u00fczerinde VersionedRoute<\/strong> attribute\u2019\u00fcn\u00fc g\u00f6rebilmekteyiz. \u0130lk parametresinde ge\u00e7erli olmas\u0131n\u0131 istedi\u011fimiz template route\u2019u g\u00f6nderirken, ikinci parametresinde ise ge\u00e7erli olmas\u0131n\u0131 istedi\u011fimiz versiyon numaras\u0131n\u0131<\/strong> set ediyoruz.
\nArt\u0131k her \u015fey haz\u0131r oldu\u011funa g\u00f6re \u00f6rne\u011fimizi deneyebilmek i\u00e7in Fiddler \u00fczerinden \u201capi\/Order\u201d URI\u2019\u0131na bir GET iste\u011finde bulunaca\u011f\u0131z. A\u015fa\u011f\u0131da \u015fekildeki gibi GET iste\u011finde bulunurken HTTP Request Header\u2019\u0131na, \u201capi-version\u201d parametresini ekleyerek \u201c2\u201d de\u011ferini verelim.<\/p>\n![\"10.6.2.1.1\"](\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\")
<\/a><\/p>\nFiddler \u00fczerinde GET request\u2019ini yukar\u0131da \u015fekildeki gibi ayarlad\u0131ktan sonra execute edelim ve IHttpRouteConstraint interface\u2019ini implemente etti\u011fimiz VersionConstraint<\/strong> class\u2019\u0131 i\u00e7erisindeki \u201cMatch\u201d method\u2019una, debug an\u0131nda bir bakal\u0131m.<\/p>\n<\/a><\/p>\nGET iste\u011finde bulundu\u011fumuz i\u00e7in request, \u00f6ncelikle Order_V1Controller i\u00e7erisindeki Get method\u2019una d\u00fc\u015fm\u00fc\u015ft\u00fcr. Get method\u2019una eklemi\u015f oldu\u011fumuz VersionedRoute<\/strong> attribute\u2019\u00fcnden dolay\u0131, hen\u00fcz method invoke edilmeden \u00f6nce constraint kontrol\u00fc i\u00e7in request, \u201cMatch\u201d method\u2019una d\u00fc\u015fm\u00fc\u015ft\u00fcr.<\/p>\nNOT:<\/strong> Asp.NET Web API uygulamas\u0131 ilk kez aya\u011fa kalkt\u0131\u011f\u0131nda, action method \u00fczerine eklemi\u015f oldu\u011fumuz \u201cVersionedRoute\u201d attribute\u2019\u00fc arac\u0131l\u0131\u011f\u0131 ile Constraints property\u2019si i\u00e7erisine olu\u015fturmu\u015f oldu\u011fumuz \u201cVersionConstraint\u201d class\u2019\u0131 eklenmektedir. Bu sayede ilgili action method\u2019a bir request geldi\u011finde, VersionConstraint class\u2019\u0131 i\u00e7erisindeki \u201cMatch\u201d method\u2019una d\u00fc\u015fmektedir.<\/p><\/blockquote>\n<\/a><\/p>\nMatch method\u2019u i\u00e7erisinde ise Request Header\u2019\u0131 \u00fczerinde g\u00f6ndermi\u015f oldu\u011fumuz \u201capi-version\u201d bilgisini elde edebilmek i\u00e7in GetVersionFromRequestHeader<\/strong> method\u2019u \u00e7a\u011f\u0131r\u0131l\u0131yor ve yukar\u0131daki gibi versiyon numaras\u0131 Request Header \u00fczerinden elde ediliyor.<\/p>\n
![\"10.6.2.1.1\"](\"\/wp-content\/uploads\/2016\/01\/10.6.2.1.1.jpg\")
<\/a><\/p>\n