{
    "type": "https://example.com/probs/out-of-credit",
    "title": "You do not have enough credit.",
    "detail": "Your current balance is 30, but that costs 50.",
    "instance": "/account/12345/msgs/abc",
    "status": 403,
}

var mediaType = response.Content.Headers.ContentType?.MediaType;
if (mediaType != null && mediaType.Equals("application/problem+json", StringComparison.InvariantCultureIgnoreCase))
{
   var problemDetails = await response.Content.ReadFromJsonAsync<ProblemDetails>(null, ct) ?? new ProblemDetails();
   // ...
}

[HttpPost("/sales/products/{sku}/availableForSale")]
public async Task<IActionResult> AvailableForSale([FromRoute] string sku)
{
   return Problem(
            "Product is already Available For Sale.",
            "/sales/products/1/availableForSale",
            400,
            "Cannot set product as available.",
            "http://example.com/problems/already-available");
}

HTTP/1.1 400 Bad Request
Content-Type: application/problem+json
Content-Language: en
{
    "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
    "title": "One or more validation errors occurred.",
    "status": 400,
    "errors": {
        "User": [
            "The user name is not verified."
        ]
    }
}

namespace WebApplication.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class DemoController : ControllerBase
    {
        [HttpPost]
        public ActionResult Post()
        {
            var problemDetails = new ProblemDetails
            {
                Detail = "The request parameters failed to validate.",
                Instance = null,
                Status = 400,
                Title = "Validation Error",
                Type = "https://example.net/validation-error",
            };

            problemDetails.Extensions.Add("invalidParams", new List<ValidationProblemDetailsParam>()
            {
                new("name", "Cannot be blank."),
                new("age", "Must be great or equals to 18.")
            });

            return new ObjectResult(problemDetails)
            {
                StatusCode = 400
            };
        }
    }

    public class ValidationProblemDetailsParam
    {
        public ValidationProblemDetailsParam(string name, string reason)
        {
            Name = name;
            Reason = reason;
        }

        public string Name { get; set; }
        public string Reason { get; set; }
    }
}

services.AddProblemDetails();

app.UseExceptionHandler();

app.UseStatusCodePages();

app.UseDeveloperExceptionPage();

builder.Services.AddProblemDetails(options =>
    options.CustomizeProblemDetails = ctx =>
            ctx.ProblemDetails.Extensions.Add("MachineName", Environment.MachineName));

public class MyErrorFeature
{
    public ErrorType Error  { get; set; }
}
​
public enum ErrorType
{
    ArgumentException
}

    [HttpGet("{value}")]
    public IActionResult MyErrorTest(int value)
    {
        if (value <= 0)
        {
            var errorType = new MyErrorFeature
            {
                Error = ErrorType.ArgumentException
            };
            HttpContext.Features.Set(errorType);
            return BadRequest();
        }
​
        return Ok(value);
    }

services.AddProblemDetails(options =>
    options.CustomizeProblemDetails = ctx =>
    {
        var MyErrorFeature = ctx.HttpContext.Features.Get<MyErrorFeature>();
​
        if (MyErrorFeature is not null)
        {
            (string Title, string Detail, string Type) details = MyErrorFeature.Error switch
            {
                ErrorType.ArgumentException =>
                (
                    nameof(ArgumentException),
                    "This is an argument-exception.",
                    "https://www.rfc-editor.org/rfc/rfc7231#section-6.5.1"
                ),
                _ =>
                (
                    nameof(Exception),
                    "default-exception",
                    "https://www.rfc-editor.org/rfc/rfc7231#section-6.6.1"
                )
            };
​
            ctx.ProblemDetails.Title = details.Title;
            ctx.ProblemDetails.Detail = details.Detail;
            ctx.ProblemDetails.Type = details.Type;
        }
    }
);

public class MyCustomException : Exception
{
    public MyCustomException(
        string message,
        HttpStatusCode statusCode = HttpStatusCode.BadRequest
    ) : base(message)
    {
        StatusCode = statusCode;
    }
​
    public HttpStatusCode StatusCode { get; }
}

    [HttpGet("{value}")]
    public IActionResult MyErrorTest(int value)
    {
        if (value <= 0)
        {
            throw new MyCustomException("The value should be positive!");
        }
​
        return Ok(value);
    }

app.UseExceptionHandler(exceptionHandlerApp =>
{
    exceptionHandlerApp.Run(async context =>
    {
        context.Response.ContentType = "application/problem+json";
​
        if (context.RequestServices.GetService<IProblemDetailsService>() is { } problemDetailsService)
        {
            var exceptionHandlerFeature = context.Features.Get<IExceptionHandlerFeature>();
            var exceptionType = exceptionHandlerFeature?.Error;
​
            if (exceptionType is not null)
            {
                (string Title, string Detail, string Type, int StatusCode) details = exceptionType switch
                {
                    MyCustomException MyCustomException =>
                    (
                        exceptionType.GetType().Name,
                        exceptionType.Message,
                        "https://www.rfc-editor.org/rfc/rfc7231#section-6.5.1",
                        context.Response.StatusCode = (int)MyCustomException.StatusCode
                    ),
                    _ =>
                    (
                        exceptionType.GetType().Name,
                        exceptionType.Message,
                        "https://www.rfc-editor.org/rfc/rfc7231#section-6.6.1",
                        context.Response.StatusCode = StatusCodes.Status500InternalServerError
                    )
                };
​
                await problemDetailsService.WriteAsync(new ProblemDetailsContext
                {
                    HttpContext = context,
                    ProblemDetails =
                    {
                        Title = details.Title,
                        Detail = details.Detail,
                        Type = details.Type,
                        Status = details.StatusCode
                    }
                });
            }
        }
    });
});
​

<h2 class='date-header'>2008/12/17</h2>

<script src='http://ajax.googleapis.com/ajax/libs/jquery/1.2.6/jquery.min.js' type='text/javascript'></script>
<script src='http://vahid.nasiri.googlepages.com/farsidate.js' type='text/javascript'></script>
<script type='text/javascript'>
$(document).ready(function() {
$("h2.date-header").each(function() {
var obj = $(this);
obj.html(ToPersianDate(new Date(obj.text())));
});

$("a[title='comment permalink']").each(function(){
 var obj = $(this);
 obj.html(ToPersianDateLong(obj.text()));
});

$("a.post-count-link").each(function() {
 var obj = $(this);
 obj.html(getBloggerPMonthNames(obj.text()));
});

$("a.post-count-link").each(function() {
  var obj = $(this);
  obj.html(getBloggerPYear(obj.text()));
});
});
</script>

• نام ماه و سال سمت راست صفحه هم فارسی شد.
• تاریخ کامنت‌ها هم فارسی شد.
  

<system.web>
    <globalization uiCulture="fa-IR" culture="fa-IR" />
</system.web>

protected void Application_BeginRequest()
{
   Thread.CurrentThread.CurrentCulture = new CultureInfo("fa-IR");
   Thread.CurrentThread.CurrentUICulture = new CultureInfo("fa-IR");
}

public void Configure(IApplicationBuilder app)
{
    app.UseRequestLocalization(new RequestLocalizationOptions
    {
        DefaultRequestCulture = new RequestCulture(new CultureInfo("fa-IR")),
        SupportedCultures = new[]
        {
            new CultureInfo("en-US"),
            new CultureInfo("fa-IR")
        },
        SupportedUICultures = new[]
        {
            new CultureInfo("en-US"),
            new CultureInfo("fa-IR")
        }
    });

 c='en-UK'|uic='en-US'

public IActionResult SetFaLanguage()
{
    Response.Cookies.Append(
        CookieRequestCultureProvider.DefaultCookieName,
        CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(new CultureInfo("fa-IR"))),
        new CookieOptions { Expires = DateTimeOffset.UtcNow.AddYears(1) }
    );
 
    return RedirectToAction("GetTitle");
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddLocalization(options => options.ResourcesPath = "Resources");
    services.AddMvc()
        .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
        .AddDataAnnotationsLocalization();

using System;
using System.Globalization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Localization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Localization;
using Microsoft.Extensions.Localization;
 
namespace Core1RtmEmptyTest.Controllers
{
    public class TestLocalController : Controller
    {
        private readonly IStringLocalizer<TestLocalController> _stringLocalizer;
        private readonly IHtmlLocalizer<TestLocalController> _htmlLocalizer;
 
        public TestLocalController(
            IStringLocalizer<TestLocalController> stringLocalizer,
            IHtmlLocalizer<TestLocalController> htmlLocalizer)
        {
            _stringLocalizer = stringLocalizer;
            _htmlLocalizer = htmlLocalizer;
        }
 
        public IActionResult Index()
        {
            var name = "DNT";
            var message = _htmlLocalizer["<b>Hello</b><i> {0}</i>", name];
            ViewData["Message"] = message;
            return View();
        }
 
        [HttpGet]
        public string GetTitle()
        {
            var about = _stringLocalizer["About Title"];
            return about;
        }
 
        public IActionResult SetFaLanguage()
        {
            Response.Cookies.Append(
                CookieRequestCultureProvider.DefaultCookieName,
                CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(new CultureInfo("fa-IR"))),
                new CookieOptions { Expires = DateTimeOffset.UtcNow.AddYears(1) }
            );
 
            return RedirectToAction("GetTitle");
        }
    }
}

@using Microsoft.AspNetCore.Mvc.Localization
@inject IViewLocalizer Localizer
 
@{
}
Message @ViewData["Message"]
<br/>
@Localizer["<b>Hello</b><i> {0}</i>", "DNT"]
<br/>
@Localizer["About Title"]

using System.ComponentModel.DataAnnotations;
 
namespace Core1RtmEmptyTest.ViewModels.Account
{
    public class RegisterViewModel
    {
        [Required(ErrorMessage = "EmailReq")]
        [EmailAddress(ErrorMessage = "EmailType")]
        [Display(Name = "Email")]
        public string Email { get; set; }
    }
}

// Dummy class to group shared resources
namespace Core1RtmEmptyTest
{
   public class SharedResource
   {
   }
}

 IStringLocalizer<SharedResource> sharedLocalizer

 @inject IHtmlLocalizer<SharedResource> SharedLocalizer

    private const string SeparatorTitle = " - ";
    private const int MaxLenghtTitle = 60;
    public static string GeneratePageTitle(params string[] crumbs)
    {
        var title = "";

        for (int i = 0; i < crumbs.Length; i++)
        {
            title += string.Format
                        (
                            "{0}{1}",
                            crumbs[i],
                            (i < crumbs.Length - 1) ? SeparatorTitle : string.Empty
                        );
        }

        title = title.Substring(0, title.Length <= MaxLenghtTitle ? title.Length : MaxLenghtTitle).Trim();

        return title;
    }

public enum CacheControlType
{
    [Description("public")]
    _public,
    [Description("private")]
    _private,
    [Description("no-cache")]
    _nocache,
    [Description("no-store")]
    _nostore
}  



private const int MaxLenghtTitle = 60;
private const int MaxLenghtDescription = 170;
private const string FaviconPath = "~/cdn/ui/favicon.ico";
public static string GenerateMetaTag(string title, string description, bool allowIndexPage, bool allowFollowLinks, string author = "", string lastmodified = "", string expires = "never", string language = "fa", CacheControlType cacheControlType = CacheControlType._private)
{
        title = title.Substring(0, title.Length <= MaxLenghtTitle ? title.Length : MaxLenghtTitle).Trim();
        description = description.Substring(0, description.Length <= MaxLenghtDescription ? description.Length : MaxLenghtDescription).Trim();

        var meta = "";
        meta += string.Format("<title>{0}</title>\n", title);
        meta += string.Format("<link rel=\"shortcut icon\" href=\"{0}\"/>\n", FaviconPath);
        meta += string.Format("<meta http-equiv=\"content-language\" content=\"{0}\"/>\n", language);
        meta += string.Format("<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\"/>\n");
        meta += string.Format("<meta charset=\"utf-8\"/>\n");
        meta += string.Format("<meta name=\"description\" content=\"{0}\"/>\n", description);
        meta += string.Format("<meta http-equiv=\"Cache-control\" content=\"{0}\"/>\n", EnumExtensions.EnumHelper<CacheControlType>.GetEnumDescription(cacheControlType.ToString()));
        meta += string.Format("<meta name=\"robots\" content=\"{0}, {1}\" />\n", allowIndexPage ? "index" : "noindex", allowFollowLinks ? "follow" : "nofollow");
        meta += string.Format("<meta name=\"expires\" content=\"{0}\"/>\n", expires);

        if (!string.IsNullOrEmpty(lastmodified))
            meta += string.Format("<meta name=\"last-modified\" content=\"{0}\"/>\n", lastmodified);

        if (!string.IsNullOrEmpty(author))
            meta += string.Format("<meta name=\"author\" content=\"{0}\"/>\n", author);

        //------------------------------------Google & Bing Doesn't Use Meta Keywords ...
        //meta += string.Format("<meta name=\"keywords\" content=\"{0}\"/>\n", keywords);

        return meta;
}

private const int MaxLenghtSlug = 45;
public static string GenerateSlug(string title)
{
        var slug = RemoveAccent(title).ToLower();
        slug = Regex.Replace(slug, @"[^a-z0-9-\u0600-\u06FF]", "-");
        slug = Regex.Replace(slug, @"\s+", "-").Trim();
        slug = Regex.Replace(slug, @"-+", "-");
        slug = slug.Substring(0, slug.Length <= MaxLenghtSlug ? slug.Length : MaxLenghtSlug).Trim();

        return slug;
}
    
private static string RemoveAccent(string text)
{
        var bytes = Encoding.GetEncoding("UTF-8").GetBytes(text);
        return Encoding.UTF8.GetString(bytes);
}

   Head.InnerHtml = SEO.GenerateMetaTag
                            (
                                title: SEO.GeneratePageTitle(".NET Tips", "آرشیو مطالب", "ASP.NET MVC #1"),
                                description: "چرا ASP.NET MVC با وجود فریم ورک پخته‌ای به نام ASP.NET web forms، اولین سؤالی که حین سوئیچ به ASP.NET MVC مطرح می‌شود این است: «برای چی؟». بنابراین تا به این سؤال پاسخ داده نشود، هر نوع بحث فنی در این مورد بی فایده است.",
                                allowIndexPage: true,
                                allowFollowLinks: true,
                                author: "وحید نصیری",
                                cacheControlType: SEO.CacheControlType._private
                            );
 

<title>.NET Tips - آرشیو مطالب - ASP.NET MVC #1</title>
<link rel="shortcut icon" href="../../cdn/images/ui/favicon.ico"/>
<meta http-equiv="content-language" content="fa"/>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<meta charset="utf-8"/>
<meta name="description" content="چرا ASP.NET MVC ؟با وجود فریم ورک پخته‌ای به نام ASP.NET web forms، اولین سؤالی که حین سوئیچ به ASP.NET MVC مطرح می‌شود این است: &#171;برای چی؟&#187;. بن ..."/>
<meta http-equiv="Cache-control" content="private"/>
<meta name="robots" content="index, follow" />
<meta name="expires" content="never"/>
<meta name="author" content="وحید نصیری"/>