| فصل | عنوان | فایل مرتبط |
| 1 | معرفی Silverlight | + |
| 2 | بررسی ساختار یک پروژه‌ی Silverlight در VS.NET | + |
| 3 | معرفی XAML | + |
| 4 | آشنایی با طرح بندی رابط کاربر در Silverlight | + |
| 5 | آشنایی با نحوه‌ی مدیریت رویدادها در Silverlight | + |
یک نکته‌ی تکمیلی: روش طراحی binding دو طرفه در Blazor SSR
در نکته‌ی قبل عنوان شد که مقدمات طراحی binding دو طرفه، داشتن حداقل سه خاصیت زیر در یک کامپوننت سفارشی است:
[Parameter] public T? Value { set; get; }
[Parameter] public EventCallback<T?> ValueChanged { get; set; }
[Parameter] public Expression<Func<T?>> ValueExpression { get; set; } = default!;اگر این خواص را به کامپوننت‌های توکار خود Blazor متصل کنیم (مانند InputBox آن و مابقی آنها)، نیازی به کدنویسی بیشتری ندارند و کار می‌کنند. اما اگر قرار است از یک input ساده‌ی Html ای استفاده کنیم، نیاز است ValueChanged آن‌را اینبار در متد OnInitialized فراخوانی کنیم؛ چون در زمان post-back به سرور است که مقدار آن در اختیار مصرف کننده‌ی کامپوننت قرار می‌گیرد. این مورد، مهم‌ترین تفاوت نحوه‌ی طراحی binding دوطرفه در Blazor SSR با مابقی حالات و نگارش‌های Blazor است.
بررسی وقوع post-back به سرور به دو روش زیر میسر است:
الف) بررسی کنیم که آیا HttpPost ای رخ‌داده‌است؟ سپس در همین لحظه، متد ValueChanged.InvokeAsync را فراخوانی کنیم:
[CascadingParameter] internal HttpContext HttpContext { set; get; } = null!;
protected override void OnInitialized()
{
base.OnInitialized();
if (HttpContext.IsPostRequest())
{
SetValueCallback(Value);
}
}
private void SetValueCallback(string value)
{
if (!ValueChanged.HasDelegate)
{
return;
}
_ = ValueChanged.InvokeAsync(value);
}در این مثال نحوه‌ی فعالسازی ارسال اطلاعات از یک کامپوننت سفارشی را به مصرف کننده‌ی آن ملاحظه می‌کنید. اینکار در قسمت OnInitialized و فقط در صورت ارسال اطلاعات به سمت سرور، فعال خواهد شد.
ب) می‌توان در قسمت OnInitialized، بررسی کرد که آیا درخواست جاری به همراه اطلاعات یک فرم ارسال شده‌ی به سمت سرور است یا خیر؟ روش کار به صورت زیر است:
protected override void OnInitialized()
{
base.OnInitialized();
if (HttpContext.Request.HasFormContentType &&
HttpContext.Request.Form.TryGetValue(ValueField.HtmlFieldName, out var data))
{
SetValueCallback(data.ToString());
}
}در اینجا از ValueField.HtmlFieldName که در نکته‌ی قبلی معرفی BlazorHtmlField به آن اشاره شد، جهت یافتن نام واقعی فیلد ورودی، استفاده شده‌است.
<modules runAllManagedModulesForAllRequests="true">
private bool shouldIgnoreRequest()
{
string[] reservedPath =
{
"/__browserLink",
"/img",
"/fonts",
"/Scripts",
"/Content"
};
var rawUrl = Context.Request.RawUrl;
if (reservedPath.Any(path => rawUrl.StartsWith(path, StringComparison.OrdinalIgnoreCase)))
{
return true;
}
return BundleTable.Bundles.Select(bundle => bundle.Path.TrimStart('~'))
.Any(bundlePath => rawUrl.StartsWith(bundlePath, StringComparison.OrdinalIgnoreCase));
} bundles.Add(new ScriptBundle("~/bundles/modernizr").Include(
"~/Scripts/modernizr-*")); protected void Application_AuthenticateRequest(Object sender, EventArgs e)
{
if (shouldIgnoreRequest()) return;
if (Context.User == null)
return; using System;
namespace System.Web.Mvc
{
public abstract class WebViewPage<TModel> : WebViewPage
{
protected WebViewPage();
public AjaxHelper<TModel> Ajax { get; set; }
public HtmlHelper<TModel> Html { get; set; }
public TModel Model { get; }
public ViewDataDictionary<TModel> ViewData { get; set; }
public override void InitHelpers();
protected override void SetViewData(ViewDataDictionary viewData);
}
}
<head>
<title>@ViewBag.Title</title>
<link href="@Url.Content("~/Content/Site.css")" rel="stylesheet" type="text/css" />
<script src="@Url.Content("~/Scripts/jquery-1.5.1.min.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.unobtrusive-ajax.min.js")" type="text/javascript"></script>
</head>
namespace MvcApplication18.Models
{
public class Employee
{
public int Id { set; get; }
public string Name { set; get; }
}
}
using System.Collections.Generic;
namespace MvcApplication18.Models
{
public static class EmployeeDataSource
{
public static IList<Employee> CreateEmployees()
{
var list = new List<Employee>();
for (int i = 0; i < 1000; i++)
{
list.Add(new Employee { Id = i + 1, Name = "name " + i });
}
return list;
}
}
}
using System.Linq;
using System.Web.Mvc;
using MvcApplication18.Models;
namespace MvcApplication18.Controllers
{
public class HomeController : Controller
{
[HttpGet]
public ActionResult Index()
{
return View();
}
[HttpPost] //for IE-8
public ActionResult EmployeeInfo(int? id)
{
if (!Request.IsAjaxRequest())
return View("Error");
if (!id.HasValue)
return View("Error");
var list = EmployeeDataSource.CreateEmployees();
var data = list.Where(x => x.Id == id.Value).FirstOrDefault();
if (data == null)
return View("Error");
return PartialView(viewName: "_EmployeeInfo", model: data);
}
}
}
@model MvcApplication18.Models.Employee
<strong>Name:</strong> @Model.Name
@{
ViewBag.Title = "Index";
}
<h2>
Index</h2>
<div id="EmployeeInfo">
@Ajax.ActionLink(
linkText: "Get Employee-1 info",
actionName: "EmployeeInfo",
controllerName: "Home",
routeValues: new { id = 1 },
ajaxOptions: new AjaxOptions
{
HttpMethod = "POST",
InsertionMode = InsertionMode.Replace,
UpdateTargetId = "EmployeeInfo",
LoadingElementId = "Progress"
})
</div>
<div id="Progress" style="display: none">
<img src="@Url.Content("~/Content/images/loading.gif")" alt="loading..." />
</div>
[AttributeUsage(AttributeTargets.Class|AttributeTargets.Method)]
public class AjaxOnlyAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (filterContext.HttpContext.Request.IsAjaxRequest())
{
base.OnActionExecuting(filterContext);
}
else
{
throw new InvalidOperationException("This operation can only be accessed via Ajax requests");
}
}
}
[AjaxOnly]
public ActionResult SomeAjaxAction()
{
return Content("Hello!");
}
<a data-ajax="true" data-ajax-loading="#Progress" data-ajax-method="POST"
data-ajax-mode="replace" data-ajax-update="#EmployeeInfo"
href="/Home/EmployeeInfo/1">Get Employee-1 info</a>
<a href="#" onclick="LoadEmployeeInfo()">Get Employee-1 info</a>
@section javascript
{
<script type="text/javascript">
function LoadEmployeeInfo() {
showProgress();
$.ajax({
type: "POST",
url: "/Home/EmployeeInfo",
data: JSON.stringify({ id: 1 }),
contentType: "application/json; charset=utf-8",
dataType: "json",
// controller is returning a simple text, not json
complete: function (xhr, status) {
var data = xhr.responseText;
if (status === 'error' || !data) {
//handleError
}
else {
$('#EmployeeInfo').html(data);
}
hideProgress();
}
});
}
function showProgress() {
$('#Progress').css("display", "block");
}
function hideProgress() {
$('#Progress').css("display", "none");
}
</script>
}
@RenderSection("javascript", required: false)
[HttpPost] //for IE-8
public ActionResult EmployeeInfoData(int? id)
{
if (!Request.IsAjaxRequest())
return Json(false);
if (!id.HasValue)
return Json(false);
var list = EmployeeDataSource.CreateEmployees();
var data = list.Where(x => x.Id == id.Value).FirstOrDefault();
if (data == null)
return Json(false);
return Json(data);
}
<a href="#" onclick="LoadEmployeeInfoData()">Get Employee-2 info</a>
@section javascript
{
<script type="text/javascript">
function LoadEmployeeInfoData() {
showProgress();
$.ajax({
type: "POST",
url: "/Home/EmployeeInfoData",
data: JSON.stringify({ id: 1 }),
contentType: "application/json; charset=utf-8",
dataType: "json",
// controller is returning the json data
success: function (result) {
if (result) {
alert(result.Id + ' - ' + result.Name);
}
hideProgress();
},
error: function (result) {
alert(result.status + ' ' + result.statusText);
hideProgress();
}
});
}
function showProgress() {
$('#Progress').css("display", "block");
}
function hideProgress() {
$('#Progress').css("display", "none");
}
</script>
}
[HttpPost] //for IE-8
public ActionResult SearchEmployeeInfo(string data)
{
if (!Request.IsAjaxRequest())
return Content(string.Empty);
if (string.IsNullOrWhiteSpace(data))
return Content(string.Empty);
var employeesList = EmployeeDataSource.CreateEmployees();
var list = employeesList.Where(x => x.Name.Contains(data)).ToList();
if (list == null || !list.Any())
return Content(string.Empty);
return PartialView(viewName: "_SearchEmployeeInfo", model: list);
}
@model IEnumerable<MvcApplication18.Models.Employee>
<table>
<tr>
<th>
Name
</th>
</tr>
@foreach (var item in Model) {
<tr>
<td>
@Html.DisplayFor(modelItem => item.Name)
</td>
</tr>
}
</table>
@using (Ajax.BeginForm(actionName: "SearchEmployeeInfo",
controllerName: "Home",
ajaxOptions: new AjaxOptions
{
HttpMethod = "POST",
InsertionMode = InsertionMode.Replace,
UpdateTargetId = "EmployeeInfo",
LoadingElementId = "Progress"
}))
{
@Html.TextBox("data")
<input type="submit" value="Search" />
}
<form action="/Home/SearchEmployeeInfo" data-ajax="true"
data-ajax-loading="#Progress" data-ajax-method="POST"
data-ajax-mode="replace" data-ajax-update="#EmployeeInfo"
id="form0" method="post">
<input id="data" name="data" type="text" value="" />
<input type="submit" value="Search" />
</form>
$.validator.unobtrusive.parse("#{form-id}");
$.ajax
({
url: "/{controller}/{action}/{id}",
type: "get",
success: function(data)
{
$.validator.unobtrusive.parse("#{form-id}");
}
});
//or
$.get('/{controller}/{action}/{id}', function (data) { $.validator.unobtrusive.parse("#{form-id}"); });
@using (Ajax.BeginForm(
"Action1",
"Controller",
null,
new AjaxOptions {
OnSuccess = "onSuccess",
UpdateTargetId = "result"
},
null)
)
{
<input type="submit" value="Save" />
}
var onSuccess = function(result) {
// enable unobtrusive validation for the contents
// that was injected into the <div id="result"></div> node
$.validator.unobtrusive.parse("#result");
};
public class ApplicationUser : IdentityUser
{
public string Email { get; set; }
public string ConfirmationToken { get; set; }
public bool IsConfirmed { get; set; }
} private string CreateConfirmationToken()
{
return ShortGuid.NewGuid();
}
private void SendEmailConfirmation(string to, string username, string confirmationToken)
{
dynamic email = new Email("RegEmail");
email.To = to;
email.UserName = username;
email.ConfirmationToken = confirmationToken;
email.Send();
}
//
// POST: /Account/Register
[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Register(RegisterViewModel model)
{
if (ModelState.IsValid)
{
string confirmationToken = CreateConfirmationToken();
var user = new ApplicationUser()
{
UserName = model.UserName,
Email = model.Email,
ConfirmationToken = confirmationToken,
IsConfirmed = false };
var result = await UserManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
SendEmailConfirmation(model.Email, model.UserName, confirmationToken);
return RedirectToAction("RegisterStepTwo", "Account");
}
else
{
AddErrors(result);
}
}
// If we got this far, something failed, redisplay form
return View(model);
} private bool ConfirmAccount(string confirmationToken)
{
ApplicationDbContext context = new ApplicationDbContext();
ApplicationUser user = context.Users.SingleOrDefault(u => u.ConfirmationToken == confirmationToken);
if (user != null)
{
user.IsConfirmed = true;
DbSet<ApplicationUser> dbSet = context.Set<ApplicationUser>();
dbSet.Attach(user);
context.Entry(user).State = EntityState.Modified;
context.SaveChanges();
return true;
}
return false;
}
[AllowAnonymous]
public ActionResult RegisterConfirmation(string Id)
{
if (ConfirmAccount(Id))
{
return RedirectToAction("ConfirmationSuccess");
}
return RedirectToAction("ConfirmationFailure");
} [HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Login(LoginViewModel model, string returnUrl)
{
if (ModelState.IsValid)
{
var user = await UserManager.FindAsync(model.UserName, model.Password);
if (user != null && user.IsConfirmed)
{
await SignInAsync(user, model.RememberMe);
return RedirectToLocal(returnUrl);
}
else
{
ModelState.AddModelError("", "Invalid username or password.");
}
}
// If we got this far, something failed, redisplay form
return View(model);
} To: @ViewBag.To
From: YOURNAME@gmail.com
Subject: Confirm your registration
Hello @ViewBag.UserName,
Please confirm your registration by following the link bellow.
@Html.ActionLink(Url.Action("RegisterConfirmation", "Account", new { id = @ViewBag.ConfirmationToken }), "RegisterConfirmation", "Account", new { id = @ViewBag.ConfirmationToken }, null) @{ Layout = null; /* Overrides the Layout set for regular page views. */ } string name = "User 1"; int age = 20; var personTuple = (name, age); Console.WriteLine(personTuple.Item1); // User 1 Console.WriteLine(personTuple.Item2); // 20
string name = "User 1"; int age = 20; var personTuple = (name: name, age:age); Console.WriteLine(personTuple.name); // User 1 Console.WriteLine(personTuple.age); // 20
string name = "User 1"; int age = 20; var personTuple = (name, age); Console.WriteLine(personTuple.name); // User 1 Console.WriteLine(personTuple.age); // 20
var p = new Person
{
Name = "User 1",
Age = 20
};
var personTuple = (p.Name, p.Age);
Console.WriteLine(personTuple.Name);
Console.WriteLine(personTuple.Age); Person p = null; var personTuple = (p?.Name, p?.Age); Console.WriteLine(personTuple.Name); // null Console.WriteLine(personTuple.Age); // null
var people = new List<Person>
{
new Person {Name = "User 1", Age = 42},
new Person {Name = "User 2", Age = 18},
new Person {Name = "User 3", Age = 21}
};
var tuples = people
.Select(person =>
(
person.Name,
person.Age,
NameAndAge: $"{person.Name} is {person.Age}"
)
);
var name = tuples.First().Name;
var age = tuples.First().Age;
var nameAndAge = tuples.First().NameAndAge; int age = 42; var personTuple = (FirstName(), age); Console.WriteLine(personTuple.Item1); Console.WriteLine(personTuple.age);
var p1 = new Person
{
Name = "User 1",
Age = 20
};
var p2 = new Person
{
Name = "User 2",
Age = 22
};
var personTuple = (p1.Name, p2.Name);
Console.WriteLine(personTuple.Item1); // User 1
Console.WriteLine(personTuple.Item2); // User 2 private static Assembly loadEmbeddedAssembly(string name)
{
if (name.EndsWith("Retargetable=Yes")) {
return Assembly.Load(new AssemblyName(name));
}
// Rest of your code
//...
} [MethodImpl(MethodImplOptions.NoOptimization)]
Cake c = new Cake(); c = new Type1(c); c = new SubType(c); //SubType derived from Cake (e.g. CakeComponent like Cream) //or: c = new Type1 (new SubType(c)); Console.WriteLine(c.Bake() + ", " + c.GetPrice());
public static void DoWork(string name)
{
if (name == null)
{
throw new ArgumentNullException("name");
}
} public static void DoWork(string name)
{
if (name == null)
{
throw new ArgumentNullException(nameof(name));
}
} 
public string Name
{
get { return _name; }
set
{
_name = value;
OnPropertyChanged("Name");
}
} OnPropertyChanged(nameof(Name));
nameof(f()); // where f is a method - you could use nameof(f) instead
nameof(c._Age); // where c is a different class and _Age is private. Nameof can't break accessor rules.
nameof(List<>); // List<> isn't valid C# anyway, so this won't work
nameof(default(List<int>)); // default returns an instance, not a member
nameof(int); // int is a keyword, not a member- you could do nameof(Int32)
nameof(x[2]); // returns an instance using an indexer, so not a member
nameof("hello"); // a string isn't a member
nameof(1 + 2); // an int isn't a member 
using System.Diagnostics;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
namespace PDFAttachment
{
class Program
{
static void Main(string[] args)
{
using (var pdfDoc = new Document(PageSize.A4))
{
var pdfWriter = PdfWriter.GetInstance(pdfDoc, new FileStream("Test.pdf", FileMode.Create));
pdfDoc.Open();
pdfDoc.Add(new Phrase("Test"));
var fs = PdfFileSpecification.FileEmbedded(pdfWriter, @"C:\path\logo.png", "logo.png", null);
pdfWriter.AddFileAttachment("توضیحات",fs);
}
Process.Start("Test.pdf");
}
}
}
using System.Diagnostics;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
namespace PDFAttachment
{
class Program
{
static void Main(string[] args)
{
using (var pdfDoc = new Document(PageSize.A4))
{
var pdfWriter = PdfWriter.GetInstance(pdfDoc, new FileStream("Test.pdf", FileMode.Create));
pdfDoc.Open();
pdfDoc.Add(new Phrase("Test"));
var filePath = @"C:\path\logo.png";
var fileInfo = new FileInfo(filePath);
var pdfDictionary = new PdfDictionary();
pdfDictionary.Put(PdfName.MODDATE, new PdfDate(fileInfo.LastWriteTime));
var fs = PdfFileSpecification.FileEmbedded(pdfWriter, filePath, fileInfo.Name, null, true, null, pdfDictionary);
pdfWriter.AddFileAttachment("توضیحات", fs);
}
Process.Start("Test.pdf");
}
}
}
pdfWriter.ViewerPreferences = PdfWriter.PageModeUseAttachments;
using System.Diagnostics;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
namespace PDFAttachment
{
class Program
{
static void Main(string[] args)
{
var reader = new PdfReader("Test.pdf");
using (var stamper = new PdfStamper(reader, new FileStream("newTest.pdf", FileMode.Create)))
{
var filePath = @"C:\path\logo.png";
addAttachment(stamper, filePath, "توضیحات");
stamper.Close();
}
Process.Start("newTest.pdf");
}
private static void addAttachment(PdfStamper stamper, string filePath, string description)
{
var fileInfo = new FileInfo(filePath);
var pdfDictionary = new PdfDictionary();
pdfDictionary.Put(PdfName.MODDATE, new PdfDate(fileInfo.LastWriteTime));
var pdfWriter = stamper.Writer;
var fs = PdfFileSpecification.FileEmbedded(pdfWriter, filePath, fileInfo.Name, null, true, null, pdfDictionary);
stamper.AddFileAttachment(description, fs);
}
}
}
