public interface IAsyncDbSet<T> : IDbSet<T> where T : class
    {
        Task<T> FindAsync(CancellationToken cancellationToken, params Object[] keyValues);
        Task<T> FindAsync(params Object[] keyValues);
    }

return base.Set<TEntity>();

namespace jQueryMvcSample03.Models
{
    public class BlogPost
    {
        public int Id { set; get; }
        public string Title { set; get; }
        public string Body { set; get; }

        /// <summary>
        /// اطلاعات رای گیری یک مطلب به صورت یک خاصیت تو در تو یا پیچیده
        /// </summary>
        public Rating Rating { set; get; }

        public BlogPost()
        {
            Rating = new Rating();
        }
    }
}

namespace jQueryMvcSample03.Models
{
    //[ComplexType]
    public class Rating
    {
        public double? TotalRating { get; set; }
        public int? TotalRaters { get; set; }
        public double? AverageRating { get; set; }
    }
}

using System.Collections.Generic;
using System.Linq;
using jQueryMvcSample03.Models;

namespace jQueryMvcSample03.DataSource
{
    /// <summary>
    /// منبع داده فرضی
    /// </summary>
    public static class BlogPostDataSource
    {
        private static IList<BlogPost> _cachedItems;
        /// <summary>
        /// با توجه به استاتیک بودن سازنده کلاس، تهیه کش، پیش از سایر فراخوانی‌ها صورت خواهد گرفت
        /// باید دقت داشت که این فقط یک مثال است و چنین کشی به معنای
        /// تهیه یک لیست برای تمام کاربران سایت است
        /// </summary>
        static BlogPostDataSource()
        {
            _cachedItems = createBlogPostsInMemoryDataSource();
        }

        /// <summary>
        /// هدف صرفا تهیه یک منبع داده آزمایشی ساده تشکیل شده در حافظه است
        /// </summary>        
        private static IList<BlogPost> createBlogPostsInMemoryDataSource()
        {
            var results = new List<BlogPost>();
            for (int i = 1; i < 30; i++)
            {
                results.Add(new BlogPost { Id = i, Title = "عنوان " + i, Body = "متن ... متن ... متن " + i, Rating = new Rating { TotalRaters = i + 1, AverageRating = 3.5 } });
            }
            return results;
        }

        /// <summary>
        /// پارامترهای شماره صفحه و تعداد رکورد به ازای یک صفحه برای صفحه بندی نیاز هستند
        /// شماره صفحه از یک شروع می‌شود
        /// </summary>
        public static IList<BlogPost> GetLatestBlogPosts(int pageNumber, int recordsPerPage = 4)
        {
            var skipRecords = pageNumber * recordsPerPage;
            return _cachedItems
                        .OrderByDescending(x => x.Id)
                        .Skip(skipRecords)
                        .Take(recordsPerPage)
                        .ToList();
        }
    }
}

/* star rating system */
.post_rating
{
direction: ltr;
}
.rating
{
text-indent: -99999px;
overflow: hidden;
background-repeat: no-repeat;
display: inline-block;
width: 8px;
height: 16px;
}
.rating.stars
{
background-image: url('Images/star_rating.png');
}
.rating.stars.active
{
cursor: pointer;
}
.star-left_off
{
background-position: -0px -0px;
}
.star-left_on
{
background-position: -16px -0px;
}
.star-right_off
{
background-position: -8px -0px;
}
.star-right_on
{
background-position: -24px -0px;
}

// <![CDATA[
(function ($) {
    $.fn.StarRating = function (options) {
        var defaults = {            
            ratingStarsSpan: '.rating.stars',
            postInfoUrl: '/',
            loginUrl: '/login',
            errorHandler: null,
            completeHandler: null,
            onlyOneTimeHandler: null
        };
        var options = $.extend(defaults, options);

        return this.each(function () {
            var ratingStars = $(this);

            $(ratingStars).unbind('mouseover');
            $(ratingStars).mouseover(function () {
                var span = $(this).parent("span");
                var newRating = $(this).attr("value");
                setRating(span, newRating);
            });

            $(ratingStars).unbind('mouseout');
            $(ratingStars).mouseout(function () {
                var span = $(this).parent("span");
                var rating = span.attr("rating");
                setRating(span, rating);
            });

            $(ratingStars).unbind('click');
            $(ratingStars).click(function () {
                var span = $(this).parent("span");
                var newRating = $(this).attr("value");
                var text = span.children("span");
                var pID = span.attr("post");
                var type = span.attr("sectiontype");
                postData({ postID: pID, rating: newRating, sectionType: type });
                span.attr("rating", newRating);
                setRating(span, newRating);
            });

            function setRating(span, rating) {
                span.find(options.ratingStarsSpan).each(function () {
                    var value = parseFloat($(this).attr("value"));
                    var imgSrc = $(this).attr("class");
                    if (value <= rating)
                        $(this).attr("class", imgSrc.replace("_off", "_on"));
                    else
                        $(this).attr("class", imgSrc.replace("_on", "_off"));
                });
            }

            function postData(dataJsonArray) {
                $.ajax({
                    type: "POST",
                    url: options.postInfoUrl,
                    data: JSON.stringify(dataJsonArray),
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    complete: function (xhr, status) {
                        var data = xhr.responseText;
                        if (xhr.status == 403) {
                            window.location = options.loginUrl;
                        }
                        else if (status === 'error' || !data) {
                            if (options.errorHandler)
                                options.errorHandler(this);
                        }
                        else if (data == "nok") {
                            if (options.onlyOneTimeHandler)
                                options.onlyOneTimeHandler(this);
                        }
                        else {
                            if (options.completeHandler)
                                options.completeHandler(this);
                        }
                    }
                });
            }
        });
    };
})(jQuery);
// ]]>

 { postID: pID, rating: newRating, sectionType: type }

<head>
    <title>@ViewBag.Title</title>    
    <link href="@Url.Content("Content/starRating.css")" rel="stylesheet" type="text/css" />
    <link href="@Url.Content("Content/Site.css")" rel="stylesheet" type="text/css" />
    <script src="@Url.Content("~/Scripts/jquery-1.9.1.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
    <script src="@Url.Content("~/Scripts/jquery.StarRating.js")" type="text/javascript"></script>
    @RenderSection("JavaScript", required: false)
</head>

@using System.Globalization
@helper AddStarRating(int postId,
                      double? average = 0, int? postRatingsCount = 0, string type = "BlogPost",
                      string tooltip = "لطفا جهت رای دادن کلیک نمائید")
    {
        string actIt = "active ";
        if (!average.HasValue) { average = 0; }
        if (!postRatingsCount.HasValue) { postRatingsCount = 0; }
    
    <span class='postRating' rating='@average' post='@postId' title='@tooltip' sectiontype='@type'>
        @for (double i = .5; i <= 5.0; i = i + .5)
        {
            string left;
            if (i <= average)
            {
                left = (i * 2) % 2 == 1 ? "left_on" : "right_on";
            }
            else
            {
                left = (i * 2) % 2 == 1 ? "left_off" : "right_off";
            }
            <span class='rating stars @(actIt)star-@left' value='@i'></span>
        }
        &nbsp;
        @if (postRatingsCount > 0)
        {
            var ratingInfo = string.Format(CultureInfo.InvariantCulture, "امتیاز {0:0.00} از 5 توسط {1} نفر", average, postRatingsCount);
            <span>@ratingInfo</span>                
        }
        else
        {
            <span></span>
        }
    </span>
}

using System.Web.Mvc;
using System.Web.UI;
using jQueryMvcSample03.DataSource;
using jQueryMvcSample03.Security;

namespace jQueryMvcSample03.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            var postsList = BlogPostDataSource.GetLatestBlogPosts(pageNumber: 0);
            return View(postsList); //نمایش صفحه اصلی
        }


        [HttpPost]
        [AjaxOnly]
        [OutputCache(Location = OutputCacheLocation.None, NoStore = true)]
        public ActionResult SaveRatings(int? postId, double? rating, string sectionType)
        {
            if (postId == null || rating == null || string.IsNullOrWhiteSpace(sectionType))
                return Content(null); //اعلام بروز خطا

            if (!this.HttpContext.CanUserVoteBasedOnCookies(postId.Value, sectionType))
                return Content("nok"); //اعلام فقط یکبار مجاز هستید رای دهید

            switch (sectionType) //قسمت‌های مختلف سایت که در جداول مختلفی قرار دارند نیز می‌توانند گزینه امتیاز دهی داشته باشند
            {
                case "BlogPost":
                    //الان شماره مطلب و رای ارسالی را داریم که می‌توان نسبت به ذخیره آن اقدام کرد
                    //مثلا
                    //_blogPostsService.SaveRating(postId.Value, rating.Value);
                    break;

                //... سایر قسمت‌های دیگر سایت

                default:
                    return Content(null); //اعلام بروز خطا
            }

            return Content("ok"); //اعلام موفقیت آمیز بودن ثبت اطلاعات
        }

        [HttpGet]
        public ActionResult Post(int? id)
        {
            if (id == null)
                return Redirect("/");

            //todo: show the content here
            return Content("Post " + id.Value);
        }
    }
}

using System;
using System.Web;

namespace jQueryMvcSample03.Security
{
    public static class CookieHelper
    {
        public static bool CanUserVoteBasedOnCookies(this HttpContextBase httpContext, int postId, string sectionType)
        {
            string key = sectionType + "-" + postId;
            var value = httpContext.GetCookieValue(key);
            if (string.IsNullOrWhiteSpace(value))
            {
                httpContext.AddCookie(key, key);
                return true;
            }
            return false;
        }

        public static void AddCookie(this HttpContextBase httpContextBase, string cookieName, string value)
        {
            httpContextBase.AddCookie(cookieName, value, DateTime.Now.AddDays(30));
        }

        public static void AddCookie(this HttpContextBase httpContextBase, string cookieName, string value, DateTime expires)
        {
            var cookie = new HttpCookie(cookieName)
            {
                Expires = expires,
                Value = httpContextBase.Server.UrlEncode(value) // For Cookies and Unicode characters
            };
            httpContextBase.Response.Cookies.Add(cookie);
        }

        public static string GetCookieValue(this HttpContextBase httpContext, string cookieName)
        {
            var cookie = httpContext.Request.Cookies[cookieName];
            if (cookie == null)
                return string.Empty; //cookie doesn't exist

            // For Cookies and Unicode characters
            return httpContext.Server.UrlDecode(cookie.Value);
        }
    }
}

using jQueryMvcSample03.Models;

namespace jQueryMvcSample03.DataSource
{
    public interface IBlogPostsService
    {
        void SaveRating(int postId, double rating);
    }

    public class SampleService : IBlogPostsService
    {
        /// <summary>
        /// یک نمونه از متد ذخیره سازی اطلاعات پیشنهادی
        /// فقط برای ایده گرفتن
        /// بدیهی است محل قرارگیری اصلی آن در لایه سرویس برنامه شما خواهد بود
        /// </summary>
        public void SaveRating(int postId, double rating)
        {
            BlogPost post = null;
            //post = _blogCtx.Find(postId); // بر اساس شماره مطلب، مطلب یافت شده و فیلدهای آن تنظیم می‌شوند
            if (post == null) return;

            if (!post.Rating.TotalRaters.HasValue) post.Rating.TotalRaters = 0;
            if (!post.Rating.TotalRating.HasValue) post.Rating.TotalRating = 0;
            if (!post.Rating.AverageRating.HasValue) post.Rating.AverageRating = 0;

            post.Rating.TotalRaters++;
            post.Rating.TotalRating += rating;
            post.Rating.AverageRating = post.Rating.TotalRating / post.Rating.TotalRaters;

            // todo: call save changes at the end.
        }
    }
}

@using System.Text.RegularExpressions
@model IList<jQueryMvcSample03.Models.BlogPost>
<ul>
    @foreach (var item in Model)
    {
        <li>
            <fieldset>
            <legend>مطلب @item.Id</legend>
                <h5>
                    @Html.ActionLink(linkText: item.Title,
                                 actionName: "Post",
                                 controllerName: "Home",
                                 routeValues: new { id = item.Id },
                                 htmlAttributes: null)
                </h5>
                @item.Body
                <div class="post_rating">
                    @Html.Raw(Regex.Replace(@StarRatingHelper.AddStarRating(item.Id, item.Rating.AverageRating, item.Rating.TotalRaters, "BlogPost").ToHtmlString(), @">\s+<", "><"))
                </div>
            </fieldset>
        </li>
    }
</ul>

@model IList<jQueryMvcSample03.Models.BlogPost>
@{
    ViewBag.Title = "Index";
    var postInfoUrl = Url.Action(actionName: "SaveRatings", controllerName: "Home");
}
<h2>
    سیستم امتیاز دهی</h2>
@{ Html.RenderPartial("_ItemsList", Model); }
@section JavaScript
{
    <script type="text/javascript">
        $(document).ready(function () {
            $(".rating.stars.active").StarRating({
                ratingStarsSpan: '.rating.stars',
                postInfoUrl: '@postInfoUrl',
                loginUrl: '/login',
                errorHandler: function () {
                    alert('خطایی رخ داده است');
                },
                completeHandler: function () {
                    alert('با تشکر! رای شما با موفقیت ثبت شد');
                },
                onlyOneTimeHandler: function () {
                    alert('فقط یکبار می‌توانید به ازای هر مطلب رای دهید');
                }
            });
        });
    </script>
}

 A first chance exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll

statusBarColor
textColorPrimary
colorAccent
ColorPrimary
WindowBackground

[Activity(Theme = "@style/NameThem")]

 [Activity(Theme = "@style/NameThem")]

<?xml version="1.0" encoding="utf-8" ?>
<resources>
  <style name="MainTheme" parent="Theme.AppCompat.Light.DarkActionBar">
     <item name="windowNoTitle">true</item>
     <item name="windowActionBar">false</item>
  </style>
</resources>

 <menu xmlns:android="http://schemas.android.com/apk/res/android">

 <?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <group android:checkableBehavior="single">
     <item android:id="@+id/menuItemHome" android:title="صفحه اصلی"></item>
     <item android:id="@+id/menuItemInsertProduct" android:title="ورود کالا جدید" ></item>
     <item android:id="@+id/menuItemListProduct" android:title="مشاهده کالاها"></item>
     <item android:id="@+id/menuItemExit"  android:title="خروج"></item>
  </group>
</menu>

<android.support.v7.widget.Toolbar
  android:layout_width="match_parent"
  android:id="@+id/toolbar1"
  android:background="#33B86C"
  android:minHeight="?android:attr/actionBarSize"
  android:layout_height="wrap_content">
</android.support.v7.widget.Toolbar>

<?xml version="1.0" encoding="utf-8" ?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <group android:checkableBehavior="single">
    <item android:id="@+id/menuItemHome" android:title="صفحه اصلی"></item>
    <item android:id="@+id/menuItemInsertProduct" android:title="ورود کالا جدید" ></item>
    <item android:id="@+id/menuItemListProduct" android:title="مشاهده کالاها"></item>
    <item android:id="@+id/menuItemExit"  android:title="خروج"></item>
  </group>
</menu>

 xmlns:app="http://schemas.android.com/apk/res-auto"

 SupportActionBar.SetDisplayShowTitleEnabled(false);

        var navigationview = this.FindViewById<NavigationView>(Resource.Id.navigationView1);
        navigationview.NavigationItemSelected += Navigationview_NavigationItemSelected;
        private void Navigationview_NavigationItemSelected(object sender, NavigationView.NavigationItemSelectedEventArgs e)
        {
            Intent intent = null;
            switch (e.MenuItem.ItemId)
            {
                case Resource.Id.menuItemHome:

                    break;
                case Resource.Id.menuItemExit:
                    Finish();
                    break;
                case Resource.Id.menuItemInsertProduct:

                    break;
                case Resource.Id.menuItemListProduct:

                    break;
            }
        }

<?xml version="1.0" encoding="utf-8" ?>
<merge xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/toolbarlayout">
    <android.support.v7.widget.Toolbar android:layout_width="match_parent" android:id="@+id/toolbar1" android:background="#33B86C" android:minHeight="?android:attr/actionBarSize" android:layout_height="wrap_content">
        <ImageButton android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/imageButton1" android:background="@drawable/mainmenu" android:layout_gravity="end" />
    </android.support.v7.widget.Toolbar>
    <android.support.v4.widget.DrawerLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/drawerLayout1" android:fitsSystemWindows="true">
        <android.support.design.widget.NavigationView android:minWidth="25px" android:minHeight="25px" android:layout_width="200dp" android:layout_height="match_parent" android:layout_gravity="end" app:menu="@menu/menu" android:id="@+id/navigationView1" android:fitsSystemWindows="true" />
    </android.support.v4.widget.DrawerLayout>
</merge>

        private void Navigationview_NavigationItemSelected(object sender, NavigationView.NavigationItemSelectedEventArgs e)
        {
            Intent intent = null;
            switch (e.MenuItem.ItemId)
            {
                case Resource.Id.menuItemHome:
                    intent = new Intent(this, typeof(MainActivity));
                    break;
                case Resource.Id.menuItemExit:
                    Finish();
                    break;
                case Resource.Id.menuItemInsertProduct:
                    intent = new Intent(this, typeof(InsertActivity));
                    break;
                case Resource.Id.menuItemListProduct:
                    intent = new Intent(this, typeof(ListProductsActivity));
                    break;
            }
            if (intent != null) { }
        }

    public class BaseAcitivity : AppCompatActivity
    {
        protected void InitieToolbar()
        {
            var toolbar = this.FindViewById<widgetV7.Toolbar>(Resource.Id.toolbar1);
            this.SetSupportActionBar(toolbar);
            //SupportActionBar.SetDisplayShowTitleEnabled(false);
            var imagebutton = toolbar.FindViewById<ImageButton>(Resource.Id.imageButton1);
            imagebutton.Click += Imagebutton_Click;
            var navigationview = this.FindViewById<NavigationView>(Resource.Id.navigationView1);
            navigationview.NavigationItemSelected += Navigationview_NavigationItemSelected;
        }

        private void Navigationview_NavigationItemSelected(object sender, NavigationView.NavigationItemSelectedEventArgs e)
        {
            Intent intent = null;
            switch (e.MenuItem.ItemId)
            {
                case Resource.Id.menuItemHome:
                    intent = new Intent(this, typeof(MainActivity));
                    break;
                case Resource.Id.menuItemExit:
                    Finish();
                    break;
                case Resource.Id.menuItemInsertProduct:
                    intent = new Intent(this, typeof(InsertActivity));
                    break;
                case Resource.Id.menuItemListProduct:
                    intent = new Intent(this, typeof(ListProductsActivity));
                    break;
            }
            if (intent != null)
                StartActivity(intent);
        }

        private void Imagebutton_Click(object sender, EventArgs e)
        {
            var drawerlayout = this.FindViewById<DrawerLayout>(Resource.Id.drawerLayout1);
            if (drawerlayout.IsDrawerOpen(Android.Support.V4.View.GravityCompat.End) == false)
            {
                drawerlayout.OpenDrawer(Android.Support.V4.View.GravityCompat.End);
            }
            else
            {
                drawerlayout.CloseDrawer(Android.Support.V4.View.GravityCompat.End);
            }
        }
    }

 android:theme="@style/Theme.AppCompat.Light.NoActionBar"

    public class Fragment1 : Android.Support.V4.App.Fragment
    {
        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
        }
        public override View OnCreateView(LayoutInflater inflater,
      ViewGroup container, Bundle savedInstanceState)
        {
            return inflater.Inflate(Resource.Layout.FragmentLayout1, container, false);
        }
    }

 var tablayout = FindViewById<Android.Support.Design.Widget.TabLayout>(Resource.Id.tabLayout1);
var viewpager = FindViewById<ViewPager>(Resource.Id.viewPager1);
tablayout.SetupWithViewPager(viewpager);

    class TabFragmentAdapter : FragmentPagerAdapter
    {
        public TabFragmentAdapter(FragmentManager fm) : base(fm)
        {
        }
        public override int Count => 3;
        public override Fragment GetItem(int position)
        {
            switch (position)
            {
                case 0: return new Fragment1();
                case 1: return new Fragment2();
                case 2: return new Fragment3();
                default: return new Fragment1();
            }
        }


        //int f1() { return 100; }
        //int f1 => 100;
    }

 viewpager.Adapter = new TabFragmentAdapter(this.SupportFragmentManager);

 tablayout.GetTabAt(0).SetIcon(Resource.Drawable.iconCall);

 View iconlayout1 = LayoutInflater.Inflate(Resource.Layout.custom_TabIconLayout, null);
var txt = iconlayout1.FindViewById<TextView>(Resource.Id.tabTextIcon);
txt.Text = "تماس";
txt.SetCompoundDrawablesWithIntrinsicBounds(Resource.Drawable.iconCall, 0, 0, 0);
tablayout.GetTabAt(0).SetCustomView(iconlayout1);

Console.WriteLine(sizeof(int));
Console.WriteLine(sizeof(char));
Console.WriteLine(sizeof(bool));
Console.WriteLine(sizeof(decimal));
Console.WriteLine(sizeof(float));

 4
2
1
16
4

 int a = 23;
float b = 3.14f;
Console.WriteLine(a.GetType());
Console.WriteLine(b.GetType());

System.Int32
System.Single

long obj1 = 356;
long obj2 = 54;
float obj3 = 234;
Console.WriteLine(object.ReferenceEquals(obj1.GetType(), obj2.GetType()));
Console.WriteLine(object.ReferenceEquals(obj1.GetType(), obj3.GetType()));

True
False

//<data type> <variable name>;
Int a;

//<data type> <variable name>=value;
Int a=23;
Int a;//declare تعریف
a=23;//مقدار دهی اولیه initializing
Int a=23;//تعریف و مقدار دهی در یک خط
Int a,b,c=23;//تعریف چند متغیر و مقدار دهی در یک خط

 int abc;
long _abcd;
float @abcd;
bool main_button;
decimal piValue;
string firstName;
string first_name;
bool button55_on;

long _a.5bc5d;
float @ab cd;
decimal pi@Value;
//استفاده از کلمات کلیدی سی شارپ که کامپایلر آنها را مجاز نمی‌داند
bool class;
string namespace;
string string;
int static;

 < data type >? < variable name >= null; //syntax

int? a = null; //assigning null
int? b = 55; //assigning null and a value
var? c = 55 //it will give error

 int? a = null;
int? b = 22;
Console.WriteLine(a.HasValue);
//------------
Console.WriteLine(b.HasValue);
Console.WriteLine(b.Value);

 False
True
22

 test obj; //allocating reference on stack
obj= new test(55);//allocating object on heap

 int a = 55;//declare a and initialize
int copya = a;//copya contains the copy of value a

test obj;
obj=new test(23);
test objCopy;
objCopy = obj;

using System.Drawing;

namespace PWS.ObjectOrientedPaint.Models
{
    /// <summary>
    /// Ellipse Draw
    /// </summary>
    public class Ellipse : Shape
    {
        #region Constructors (2)

        /// <summary>
        /// Initializes a new instance of the <see cref="Ellipse" /> class.
        /// </summary>
        /// <param name="startPoint">The start point.</param>
        /// <param name="endPoint">The end point.</param>
        /// <param name="zIndex">Index of the z.</param>
        /// <param name="foreColor">Color of the fore.</param>
        /// <param name="thickness">The thickness.</param>
        /// <param name="isFill">if set to <c>true</c> [is fill].</param>
        /// <param name="backgroundColor">Color of the background.</param>
        public Ellipse(PointF startPoint, PointF endPoint, int zIndex, Color foreColor, byte thickness, bool isFill, Color backgroundColor)
            : base(startPoint, endPoint, zIndex, foreColor, thickness, isFill, backgroundColor)
        {
            ShapeType = ShapeType.Ellipse;
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="Ellipse" /> class.
        /// </summary>
        public Ellipse()
        {
            ShapeType = ShapeType.Ellipse;
        }

        #endregion Constructors

        #region Methods (1)

        // Public Methods (1) 

        /// <summary>
        /// Draws the specified g.
        /// </summary>
        /// <param name="g">The g.</param>
        public override void Draw(Graphics g)
        {
            if (IsFill)
                g.FillEllipse(BackgroundBrush, StartPoint.X, StartPoint.Y, Width, Height);
            g.DrawEllipse(Pen, StartPoint.X, StartPoint.Y, Width, Height);
            base.Draw(g);
        }

        #endregion Methods
    }
}

{
   path: 'products',
   loadChildren:'app/product/product.module#ProductModule'
},

const routes: Routes = [
  { path: 'home', component: WelcomeComponent },
  { path: 'welcome', redirectTo: 'home', pathMatch: 'full' },
  { path: 'products', loadChildren: 'app/product/product.module#ProductModule' },
  { path: '', redirectTo: 'home', pathMatch: 'full' },
  { path: '**', component: PageNotFoundComponent }
];

chunk    {0} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 165 kB {4} [initial]
chunk    {1} main.bundle.js, main.bundle.js.map (main) 32.7 kB {3} [initial] [rendered]
chunk    {2} styles.bundle.js, styles.bundle.js.map (styles) 129 kB {4} [initial]
chunk    {3} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.72 MB [initial] [rendered]
chunk    {4} inline.bundle.js, inline.bundle.js.map (inline) 0 bytes [entry]
chunk    {5} 5.chunk.js, 5.chunk.js.map 51.1 kB {1} [rendered]

const routes: Routes = [
  {
    path: 'products',
    canActivate: [ AuthGuard ],
    children: [   ]
  }
];

import { AuthGuard } from './user/auth.guard';

const routes: Routes = [
  { path: 'home', component: WelcomeComponent },
  { path: 'welcome', redirectTo: 'home', pathMatch: 'full' },
  {
    path: 'products',
    loadChildren: 'app/product/product.module#ProductModule',
    canActivate: [AuthGuard]
  },
  { path: '', redirectTo: 'home', pathMatch: 'full' },
  { path: '**', component: PageNotFoundComponent }
];

const routes: Routes = [
  {
    path: '',
    component: ProductListComponent
  },
  {
    path: ':id',
    component: ProductDetailComponent,
    resolve: { product: ProductResolverService }
  },
  {
    path: ':id/edit',
    component: ProductEditComponent,
    resolve: { product: ProductResolverService },
    canDeactivate: [ProductEditGuard],
    children: [
      { path: '', redirectTo: 'info', pathMatch: 'full' },
      { path: 'info', component: ProductEditInfoComponent },
      { path: 'tags', component: ProductEditTagsComponent }
    ]
  }
];

import { ActivatedRouteSnapshot, RouterStateSnapshot, CanActivate, Router, CanLoad, Route } from '@angular/router';

@Injectable()
export class AuthGuard implements CanActivate, CanLoad {

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    return this.checkLoggedIn(state.url);
  }

  canLoad(route: Route): boolean {
    return this.checkLoggedIn(route.path);
  }

 // … the same as before

}

  {
    path: 'products',
    loadChildren: 'app/product/product.module#ProductModule',
    canLoad: [AuthGuard]
  },

import { Routes, RouterModule, PreloadAllModules } from '@angular/router';

@NgModule({
  imports: [RouterModule.forRoot(
    routes,
    { enableTracing: true, preloadingStrategy: PreloadAllModules  /*, useHash: true*/ }
  )],

 >ng g s SelectiveStrategy -m app.module

 installing service
  create src\app\selective-strategy.service.spec.ts
  create src\app\selective-strategy.service.ts
  update src\app\app.module.ts

import { Injectable } from '@angular/core';
import { Route, PreloadingStrategy } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';

@Injectable()
export class SelectiveStrategyService implements PreloadingStrategy {

  preload(route: Route, load: Function): Observable<any> {
    if (route.data && route.data['preload']) {
      return load();
    }
    return Observable.of(null);
  }
}

import { SelectiveStrategyService } from './selective-strategy.service';

@NgModule({
  imports: [RouterModule.forRoot(
    routes,
    { enableTracing: true, preloadingStrategy: SelectiveStrategyService
     /*, preloadingStrategy: PreloadAllModules*/  /*, useHash: true*/ }
  )],

  {
    path: 'products',
    loadChildren: 'app/product/product.module#ProductModule',
    //canLoad: [AuthGuard] 
    canActivate: [AuthGuard],
    data: { preload: true }
  },