asp.net WEBAPI implementation request frequency limit __.net

SampleController.cs

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Threading.Tasks;
Using System.Web;
Using System.Web.Http;

Namespace App.controllers
{
    [throttle] public
    class Samplecontroller:apicontroller
    {
        [ HttpGet] public
        async task<ihttpactionresult> get () => await Task.fromresult (ok Guid.NewGuid (). ToString ());
    }

ThrottleAttribute.cs

Using System;
Using System.Collections.Generic;
Using System.Linq;
Using System.Net;
Using System.Net.Http;
Using System.Threading;
Using System.Threading.Tasks;
Using System.Web;
Using System.Web.Http.Controllers;

Using System.Web.Http.Filters; namespace App {[AttributeUsage attributetargets.class | AttributeTargets.Method)] public class Throttleattribute:actionfilterattribute {private ReadOnly Handle
        Request _handlerequest;
        Public Throttleattribute () {this._handlerequest = new handlerequest (); public override Async Task Onactionexecutingasync (httpactioncontext actioncontext, CancellationToken Cancellati
            Ontoken) {var valid = await this._handlerequest.isvalidrequest (actioncontext.request); if (!valid) {actioncontext.response = new Httpresponsemessage ((httpstatuscode) 429) {REASONPH
            Rase = "Too Many requests!"}; }
        }
    }
}

HandleRequest.cs

Using System;
Using System.Collections.Generic;
Using System.Configuration;
Using System.Linq;
Using System.Net.Http;
Using System.ServiceModel.Channels;
Using System.Threading.Tasks;
Using System.Web;

Using System.Web.Caching;

        Namespace APP {public class HandleRequest {private string Name {get;} = ' Client1 '; private int Seconds {get;} = Int.


        Parse (ConfigurationManager.AppSettings.Get ("Waitmillisecond")); Public async task<bool> Isvalidrequest (httprequestmessage requestmessage) {var allowexecute = f
            Alse; Await Task.Factory.StartNew (() => {var key = string.
                Concat (Name, "-", Getclientip (Requestmessage));
                        if (httpruntime.cache[key] = = null) {HTTPRUNTIME.CACHE.ADD (key),
                        True,//This is the smallest amount of data we can have.
  NULL,//No dependency DateTime.Now.AddMilliseconds (Seconds),//absolute expiration                      Cache.noslidingexpiration, Cacheitempriority.low, Nu ll);
                No callback Allowexecute = true;


            }
            });
        return allowexecute; private string Getclientip (Httprequestmessage request) {//Get traditional context if (req Uest. Properties.containskey ("Ms_httpcontext")) {//httpcontextwrapper class is derived from the HttpContextBase class. The Httpcontextwrapper class is used as a wrapper for the HttpContext class.
                At run time, you typically invoke the members on the HttpContext object using an instance of the Httpcontextwrapper class. Return (httpcontextwrapper) request. properties["Ms_httpcontext"]).
            request.userhostaddress;
            //cs client obtains IP address//makes available the client IP address and port number associated with the remote endpoint that sent the message. if (request). Properties.containskey (Remoteendpointmessageproperty.name)) {Remoteendpointmessageproperty PR
                Op Prop = (Remoteendpointmessageproperty) requeSt.
                Properties[remoteendpointmessageproperty.name]; Return Prop.
            address;
        return null; }
    }
}

Run Result:

The result of a continuous request within 1 minutes: