<Comp1>This is a content coming from the parent</Comp1>

@page "/ParentComponent"

<h1 class="text-danger">Parent Child Component</h1>

<ChildComponent Title="This title is passed as a parameter from the Parent Component">
    A `Render Fragment` from the parent!
</ChildComponent>

<ChildComponent Title="This is the second child component"></ChildComponent>

@code {

}

<li class="nav-item px-3">
    <NavLink class="nav-link" href="ParentComponent">
       <span class="oi oi-list-rich" aria-hidden="true"></span> Parent/Child Relation
    </NavLink>
</li>

<div>
    <div class="alert alert-info">@Title</div>
    <div class="alert alert-success">
        @if (ChildContent == null)
        {
            <span> Hello, from Empty Render Fragment </span>
        }
        else
        {
            <span>@ChildContent</span>
        }
    </div>
</div>


@code {
    [Parameter]
    public string Title { get; set; }

    [Parameter]
    public RenderFragment ChildContent { get; set; }
}

<button class="btn btn-danger"
        @onclick="@(() => OnClickBtnMethod.InvokeAsync((1, "A message from child!")))">
   Show a message from the child!
</button>


@code {
    // ...

    [Parameter]
    public EventCallback<(int, string)> OnClickBtnMethod { get; set; }
}

@page "/ParentComponent"

<h1 class="text-danger">Parent Child Component</h1>

<ChildComponent
    OnClickBtnMethod="ShowMessage"
    Title="This title is passed as a parameter from the Parent Component">
    A `Render Fragment` from the parent!
</ChildComponent>

<ChildComponent Title="This is the second child component">
    <p><b>@MessageText</b></p>
</ChildComponent>

@code {
    string MessageText = "";

    private void ShowMessage((int Value, string Message) args)
    {
        MessageText = args.Message;
    }
}

@code {
    // ...

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter]
    public RenderFragment DangerChildContent { get; set; }
}

<ChildComponent
    OnClickBtnMethod="ShowMessage"
    Title="This title is passed as a parameter from the Parent Component">
    <ChildContent>
        A `Render Fragment` from the parent!
    </ChildContent>
    <DangerChildContent>
        A danger content from the parent!
    </DangerChildContent>
</ChildComponent>

    @if(DangerChildContent == null)
    {
        @if (ChildContent == null)
        {
            <span> Hello, from Empty Render Fragment </span>
        }
        else
        {
            <span>@ChildContent</span>
        }
    }
    else
    {
        <span>@DangerChildContent</span>
    }

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• تغییرات آتی مایکروسافت در سایت CodePlex

• و مروری بر 13 سیستم عامل در چند ثانیه!

[DataContract(IsReference = true)]
public class Post
{
    public Post()
    {
        comments = new HashSet<Comments>();
    }
    
    [DataMember]
    public int PostId { get; set; }
    [DataMember]
    public string Title { get; set; }
    [DataMember]
    public virtual ICollection<Comment> Comments { get; set; }
}

[DataContract(IsReference=true)]
public class Comment
{
    [DataMember]
    public int CommentId { get; set; }
    [DataMember]
    public int PostId { get; set; }
    [DataMember]
    public string CommentText { get; set; }
    [DataMember]
    public virtual Post Post { get; set; }
}

public class EFRecipesEntities : DbContext
{
    public EFRecipesEntities() : base("name=EFRecipesEntities") {}

    public DbSet<Post> posts;
    public DbSet<Comment> comments;
}

<connectionStrings>
  <add name="Recipe2ConnectionString"
    connectionString="Data Source=.;
    Initial Catalog=EFRecipes;
    Integrated Security=True;
    MultipleActiveResultSets=True"
    providerName="System.Data.SqlClient" />
</connectionStrings>

[ServiceContract]
public interface IService1
{
    [OperationContract]
    void Cleanup();
    [OperationContract]
    Post GetPostByTitle(string title);
    [OperationContract]
    Post SubmitPost(Post post);
    [OperationContract]
    Comment SubmitComment(Comment comment);
    [OperationContract]
    void DeleteComment(Comment comment);
}

class Program
{
    static void Main(string[] args)
    {
        using (var client = new ServiceReference2.Service1Client())
        {
            // cleanup previous data
            client.Cleanup();
            // insert a post
            var post = new Post { Title = "POCO Proxies" };
            post = client.SubmitPost(post);
            // update the post
            post.Title = "Change Tracking Proxies";
            client.SubmitPost(post);
            // add a comment
            var comment1 = new Comment { CommentText = "Virtual Properties are cool!", PostId = post.PostId };
            var comment2 = new Comment { CommentText = "I use ICollection<T> all the time", PostId = post.PostId };
            comment1 = client.SubmitComment(comment1);
            comment2 = client.SubmitComment(comment2);
            // update a comment
            comment1.CommentText = "How do I use ICollection<T>?";
            client.SubmitComment(comment1);
            // delete comment 1
            client.DeleteComment(comment1);
            // get posts with comments
            var p = client.GetPostByTitle("Change Tracking Proxies");
            Console.WriteLine("Comments for post: {0}", p.Title);
            foreach (var comment in p.Comments)
            {
                Console.WriteLine("\tComment: {0}", comment.CommentText);
            }
        }
    }
}

using System.IO;
using System.Web.Mvc;

namespace MVC4Basic.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        const int AMonth = 30 * 86400;

        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));
            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }
    }
}

 <img src="@Url.Action("GetImage","Home", new { name = "test.png"})"/>

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK

Response Headers
Cache-Control:public, max-age=2591916
Expires:Sat, 31 May 2014 12:45:55 GMT
Last-Modified:Thu, 01 May 2014 12:45:55 GMT

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:304 Not Modified

Request Headers
If-Modified-Since:Thu, 01 May 2014 12:45:55 GMT

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK (from cache)

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK

Request Headers
If-Modified-Since:Thu, 01 May 2014 12:45:55 GMT

using System;
using System.IO;
using System.Net;
using System.Web.Mvc;

namespace MVC4Basic.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        const int AMonth = 30 * 86400;

        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));

            var lastWriteTime = System.IO.File.GetLastWriteTime(path);
            this.Response.Cache.SetLastModified(lastWriteTime.ToUniversalTime());

            var header = this.Request.Headers["If-Modified-Since"];
            if (!string.IsNullOrWhiteSpace(header))
            {
                DateTime isModifiedSince;
                if (DateTime.TryParse(header, out isModifiedSince) && isModifiedSince > lastWriteTime)
                {
                    return new HttpStatusCodeResult(HttpStatusCode.NotModified);
                }
            }

            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }
    }
}

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:304 Not Modified

Request Headers
If-Modified-Since:Thu, 01 May 2014 13:43:32 GMT

    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public sealed class SetIfModifiedSinceAttribute : ActionFilterAttribute
    {
        public string Parameter { set; get; }
        public string BasePath { set; get; }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var response = filterContext.RequestContext.HttpContext.Response;
            var request = filterContext.RequestContext.HttpContext.Request;

            var path = getPath(filterContext);
            if (string.IsNullOrWhiteSpace(path))
            {
                response.StatusCode = (int)HttpStatusCode.NotFound;
                filterContext.Result = new EmptyResult();
                return;
            }

            var lastWriteTime = File.GetLastWriteTime(path);
            response.Cache.SetLastModified(lastWriteTime.ToUniversalTime());

            var header = request.Headers["If-Modified-Since"];
            if (string.IsNullOrWhiteSpace(header)) return;
            DateTime isModifiedSince;
            if (DateTime.TryParse(header, out isModifiedSince) && isModifiedSince > lastWriteTime)
            {
                response.StatusCode = (int)HttpStatusCode.NotModified;
                response.SuppressContent = true;
                filterContext.Result = new EmptyResult();
            }
        }

        string getPath(ActionExecutingContext filterContext)
        {
            if (!filterContext.ActionParameters.ContainsKey(Parameter)) return string.Empty;
            var name = filterContext.ActionParameters[Parameter] as string;
            if (string.IsNullOrWhiteSpace(name)) return string.Empty;

            var path = Path.GetFileName(name);
            path = filterContext.HttpContext.Server.MapPath(string.Format("{0}/{1}", BasePath, path));
            return !File.Exists(path) ? string.Empty : path;
        }
    }

        [SetIfModifiedSince(Parameter = "name", BasePath = "~/app_data/images/")]
        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));
            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }

 public class UserController
 {        
        protected void OnClickCreate(object sender, EventArgs e)
        {
           // call validation services
           // call create user services
        }
 }

    public class UserWebApiController
    {
        [HttpPost]
        public HttpResponseMessage Create(UserViewModel user)
        {
            // call validation services
            // call create user services
        }
    }

    // سازنده
    public class B
    {
        public static A CreateA(string name, string lastName, string job)
        {
            return new A() {
                Name =name,
                LastName = lastName,
                Job = job
            };
        }
    }
    // ایجاد شونده
    public class A
    {
        public string Name { get; set; }
        public string LastName { get; set; }
        public string Job { get; set; }
    }

    public class Context
    {
        public void Main()
        {
            var name = "Rasoul";
            var lastName = "Abbasi";
            var job = "Developer";            
            var obj = B.CreateA(name, lastName, job);
        }
    }

    class Controller
    {
        public void CreateProduct(string name, int categoryId) { }
        public void EditProduct(int id, string name) { }
        public void DeleteProduct(int id) { }
        public void CreateCategory(string name) { }
        public void EditCategory(int id, string name) { }
        public void DeleteCategory(int id) { }
    }  

    class SenderA
    {
        public Mediator mediator { get; }
        public SenderA() { mediator = new Mediator(); }
        public void Send(string message, string reciever) { mediator.Send(message, reciever); }
    }
    class SenderB
    {
        public Mediator mediator { get; }
        public SenderB() { mediator = new Mediator(); }
        public void Send(string message) { }
    }

    public class RecieverA
    {
        public void DoAction(string message)
        {
            // انجام عملیات بر اساس پیغام دریافت شده
            switch (message)
            {
                case "create":
                    break;
                case "delete":
                    break;
                default:
                    break;
            }
        }
    }
    public class RecieverB
    {
        public void DoAction(string message)
        {
            // انجام عملیات بر اساس پیغام دریافت شده
            switch (message)
            {
                case "edit":
                    break;
                case "rollback":
                    break;
                default:
                    break;
            }
        }
    }
    class Mediator
    {
        internal void Send(string message, string reciever)
        {
            switch (reciever)
            {
                case "A":
                    var recieverObjA = new RecieverA();
                    recieverObjA.DoAction(message);
                    break;
                case "B":
                    var recieverObjB = new RecieverB();
                    recieverObjB.DoAction(message);
                    break;

                default:
                    break;
            }
        }
    }
    class IndirectionContext
    {
        public void Main()
        {
            var senderA = new SenderA();
            senderA.Send("rollback", "B");
            var senderB = new SenderA();
            senderB.Send("create", "A");

        }
    }