public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Web API configuration and services

        // Web API routes
        config.MapHttpAttributeRoutes();
    }
}

public class VideoStream
{
    private readonly string _filename;
    private long _contentLength;

    public long FileLength
    {
        get { return _contentLength; }
    }

    public VideoStream(string videoPath)
    {
        _filename = videoPath;
        using (var video = File.Open(_filename, FileMode.Open, FileAccess.Read, FileShare.Read))
        {
            _contentLength = video.Length;
        }
    }

    public async void WriteToStream(Stream outputStream,
        HttpContent content, TransportContext context)
    {
        try
        {
            var buffer = new byte[65536];

            using (var video = File.Open(_filename, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                var length = (int)video.Length;
                var bytesRead = 1;

                while (length > 0 && bytesRead > 0)
                {
                    bytesRead = video.Read(buffer, 0, Math.Min(length, buffer.Length));
                    await outputStream.WriteAsync(buffer, 0, bytesRead);
                    length -= bytesRead;
                }
            }
        }
        catch (HttpException)
        {
            return;
        }
        finally
        {
            outputStream.Close();
        }
    }
}

while (length > 0 && bytesRead > 0)
{
    bytesRead = video.Read(buffer, 0, Math.Min(length, buffer.Length));
    await outputStream.WriteAsync(buffer, 0, bytesRead);
    length -= bytesRead;
}

public class VideoController : ApiController
{
    [Route("api/video/{ext}/{fileName}")]
    public HttpResponseMessage Get(string ext, string fileName)
    {
        string videoPath = HostingEnvironment.MapPath(string.Format("~/Videos/{0}.{1}", fileName, ext));
        if (File.Exists(videoPath))
        {
            FileInfo fi = new FileInfo(videoPath);
            var video = new VideoStream(videoPath);

            var response = Request.CreateResponse();

            response.Content = new PushStreamContent((Action<Stream, HttpContent, TransportContext>)video.WriteToStream,
                new MediaTypeHeaderValue("video/" + ext));

            response.Content.Headers.Add("Content-Disposition", "attachment;filename=" + fi.Name.Replace(" ", ""));
            response.Content.Headers.Add("Content-Length", video.FileLength.ToString());

            return response;
        }
        else
        {
            return Request.CreateResponse(HttpStatusCode.NotFound);
        }
    }
}

[Route("api/video/{ext}/{fileName}")]

api/video/mp4/sample

string videoPath = HostingEnvironment.MapPath(string.Format("~/Videos/{0}.{1}", fileName, ext));

var video = new VideoStream(videoPath);

var response = Request.CreateResponse();

response.Content = new PushStreamContent((Action<Stream, HttpContent, TransportContext>)video.WriteToStream, new MediaTypeHeaderValue("video/" + ext));

response.Content.Headers.Add("Content-Disposition", "attachment;filename=" + fileName);
response.Content.Headers.Add("Content-Length", video.FileLength.ToString());

if(File.Exists(videoPath))
{
    // removed for bravity
}
else
{
    return Request.CreateResponse(HttpStatusCode.NotFound);
}

public class HomeController : Controller
{
    // GET: Home
    public ActionResult Index()
    {
        return View();
    }
}

<div>
    <div>
        <video width="480" height="270" controls="controls" preload="auto">
            <source src="/api/video/mp4/sample" type="video/mp4" />
            Your browser does not support the video tag.
        </video>
    </div>
</div>

{
    "ambientDependencies": {
        "es6-shim": "registry:dt/es6-shim#0.31.2+20160317120654",
        "jasmine": "registry:dt/jasmine#2.2.0+20160412134438",
        "node": "registry:dt/node#4.0.0+20160509154515"
    }
}

/// <reference path="../typings/browser/ambient/es6-shim/index.d.ts" />
/// <reference path="../typings/browser/ambient/node/index.d.ts" /> 
 
import { bootstrap } from '@angular/platform-browser-dynamic';
import { enableProdMode } from '@angular/core';
 
// Our main component
import { AppComponent } from "./app.component";
 
if (process.env.ENV === "production") {
    enableProdMode();
}
 
bootstrap(AppComponent, []);

@Component({
    selector: 'pm-products',
    //templateUrl: 'app/products/product-list.component.html',
    template: require('./product-list.component.html'),
    //styleUrls: ['app/products/product-list.component.css'],
    styles: [require('./product-list.component.css')],
    pipes: [ProductFilterPipe],
    directives: [StarComponent, ROUTER_DIRECTIVES]
})

            routes.MapRoute(
                "SiteMap_route", // Route name
                "sitemap.xml", // URL with parameters
                new { controller = "Sitemap", action = "index", name = UrlParameter.Optional, area = "" } // Parameter defaults
            );

        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );

            routes.MapRoute(
                "SiteMap_route", // Route name
                "sitemap.xml", // URL with parameters
                new { controller = "Sitemap", action = "index", name = UrlParameter.Optional, area = "" } // Parameter defaults
            );
        }

 RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes);

        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "SiteMap_route", // Route name
                "sitemap.xml", // URL with parameters
                new { controller = "Sitemap", action = "index", name = UrlParameter.Optional, area = "" } // Parameter defaults
            );

            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );      
        }

(ratingClicked)='onRatingClicked($event)'

import { provideRouter, RouterConfig } from '@angular/router';
import { SubSystemComponent } from './subsystem/subsystem.component';
import { AppComponent } from './app.component';

const routes: RouterConfig = [
    { path: 'Subsystem', component: SubSystemComponent },
    { path: '', component: SubSystemComponent }
];

export const appRouterProviders = [
    provideRouter(routes)
];

<div>
    <div>Header</div>
    <div style="float:right">
        Menu
        <!--<app-menu #menucomp [subSystemId]="currentSubsSystemId">Loading Menu</app-menu>-->
    </div>
    <div>
        <!--روتر پیش فرض اینجا نمایش داده میشود نیاز است برای این روتر پارامتر ورودی و خروجی تعیین کرد-->
        <router-outlet></router-outlet>
    </div>
</div>

Try Bazel’s opt-in preview in Angular CLI

In Google we build all our software with a tool called Bazel. We’ve been using it for the past over 12 years to build projects with any size — from small internal apps, to large applications such as Gmail, Google Drive, and Google Cloud Console.