WEBAPI Global Exception handling methods

Custom error messages

 public class Errormessage:delegatinghandler {protected override task
 Global exception handling includes 404 
 
public class Notfoundactionselector:apicontrolleractionselector {public override Httpactiondescriptor Selectac            tion (httpcontrollercontext controllercontext) {httpactiondescriptor decriptor = null; try {decriptor = base.            SelectAction (ControllerContext); } catch (Httpresponseexception ex) {var code = Ex.                Response.statuscode;                if (Code! = Httpstatuscode.notfound && Code! = httpstatuscode.methodnotallowed) throw;                var routedata = Controllercontext.routedata;                Routedata.values["action"] = "Handle404";                Ihttpcontroller Httpcontroller = new Errorcontroller ();                Controllercontext.controller = Httpcontroller; Controllercontext.controllerdescriptor = new Httpcontrollerdescriptor (controllercontext.configuration, "Error",                Httpcontroller.gettype ()); Decriptor =Base.            SelectAction (ControllerContext);        } return decriptor; }    }
　　
public class Notfoundcontrollerselector:defaulthttpcontrollerselector    {public        Notfoundcontrollerselector (httpconfiguration configuration)            : Base (Configuration)        {        } public        override Httpcontrollerdescriptor Selectcontroller (httprequestmessage request)        {            Httpcontrollerdescriptor Decriptor = null;            Try            {                Decriptor = base. Selectcontroller (request);            }            catch (Httpresponseexception ex)            {                var code = ex. Response.statuscode;                if (Code! = httpstatuscode.notfound)                    throw;                var routevalues = Request. Getroutedata (). Values;                routevalues["Controller" = "Error";                Routevalues["action"] = "Handle404";                Decriptor = base. Selectcontroller (request);            }            return decriptor;        }    }
 Permission filtering 
 
public class Supportfilter:authorizeattribute {//Override base class validation method, add our custom ticket verify Redishelper Redis = new Re        Dishelper (1); public override void Onauthorization (System.Web.Http.Controllers.HttpActionContext actioncontext) {//ur            L Get token var content = actioncontext.request.properties["Ms_httpcontext"] as httpcontextbase; var token = content.            request.querystring["Token"]; var userid = content. request.querystring["userid"]! = null? Int. Parse (content.            request.querystring["userid"]): 0; var mac = content. Request.querystring["Mac"]! = null? Content.            Request.querystring["Mac"]: null;            var routes = new RouteCollection ();            Routeconfig.registerroutes (routes); Routedata Routedata = routes.            Getroutedata (content);            The controller of the extraction area Action,id string controller = ActionContext.ActionDescriptor.ControllerDescriptor.ControllerName; String action = Actioncontext.actionDescriptor.actionname;            URL path string filePath = HttpContext.Current.Request.FilePath; if (Controller. ToLower () = = "User" && action. ToLower () = = "Login") | | (Controller. ToLower () = = "User" && action. ToLower () = = "Register") | | (Controller. ToLower () = = "banner" && action. ToLower () = = "Getbanner") | | (Controller. ToLower () = = "Device" && action. ToLower () = = "Login") {} else {var attribute s = actioncontext.actiondescriptor.getcustomattributes<allowanonymousattribute> ().                Oftype<allowanonymousattribute> (); BOOL isanonymous = attributes.                Any (a = A is allowanonymousattribute); if (isanonymous) base.                Onauthorization (Actioncontext); if (userid! = 0 && Token! = null && token. Length > 0) {if (Redis. Stringget ("User_token_" + userid.)ToString ())! = token) {handleunauthorizedrequest (actioncontext); }} else if (Mac! = NULL && token! = null && token. Length > 0) {if (Redis. Stringget ("Device_token_" + Mac)! = token) {handleunauthorizedrequest (Actioncon                    Text);            }} else Handleunauthorizedrequest (Actioncontext); }} protected override void Handleunauthorizedrequest (Httpactioncontext actioncontext) {b Ase.            Handleunauthorizedrequest (Actioncontext); if (ActionContext.Response.StatusCode = = System.Net.HttpStatusCode.Unauthorized) {Actioncontext . Response.content = new Stringcontent (SERIALIZEUTILS&LT;BASERESMODEL&LT;BASEMODEL&GT;&GT;. Serialize (New Basemodel () {Errorno = -4, errormsg = ""}), SysteM.text.encoding.utf8, "Application/json"); }        }    }
　　
　　
Configuring in Webconfig
   Config. Messagehandlers.add (New ErrorMessage ());            Config. Filters.add (New Supportfilter ());            Config. Services.replace (typeof (Ihttpcontrollerselector), new Notfoundcontrollerselector (config));            Config. Services.replace (typeof (Ihttpactionselector), New Notfoundactionselector ());            Web API Routing            config. Maphttpattributeroutes ();            Config. Routes.maphttproute (                name: "Defaultapi",                routetemplate: "Api/{controller}/{id}",                defaults:new {id = Routeparameter.optional}            );            Config. Routes.maphttproute (              name: "Error404",              routetemplate: "{*url}",              defaults:new {controller = "Error", Action = "Handle404"}          );
　　
 Webapi Global Exception handling