Load resource file based on culture and session state value - asp.net-core-mvc

Question

I have a requirement to change the content of a .Net core mvc web app based on culture[Lauguage] and a particular session value which will be set based on a dropdown selection.
I have a dropdown of States [PA, VA, .. etc], so created resource files viewname.PA.en.resx, viewname.VA.en.resx.
Need to load the appropriate resource file based on my dropdown selection and language culture.
currently it's loading based language culture only.

Answer 1

Please refer the official document and sample.
You could create a _SelectLanguagePartial.cshtml partial view with the following code:
#using Microsoft.AspNetCore.Builder
#using Microsoft.AspNetCore.Http.Features
#using Microsoft.AspNetCore.Localization
#using Microsoft.AspNetCore.Mvc.Localization
#using Microsoft.Extensions.Options
#inject IViewLocalizer Localizer
#inject IOptions<RequestLocalizationOptions> LocOptions
#{
var requestCulture = Context.Features.Get<IRequestCultureFeature>();
var cultureItems = LocOptions.Value.SupportedUICultures
.Select(c => new SelectListItem { Value = c.Name, Text = c.DisplayName })
.ToList();
var returnUrl = string.IsNullOrEmpty(Context.Request.Path) ? "~/" : $"~{Context.Request.Path.Value}";
}
<div title="#Localizer["Request culture provider:"] #requestCulture?.Provider?.GetType().Name">
<form id="selectLanguage" asp-controller="Home"
asp-action="SetLanguage" asp-route-returnUrl="#returnUrl"
method="post" class="form-horizontal" role="form">
<label asp-for="#requestCulture.RequestCulture.UICulture.Name">#Localizer["Language:"]</label> <select name="culture"
onchange="this.form.submit();"
asp-for="#requestCulture.RequestCulture.UICulture.Name" asp-items="cultureItems">
</select>
</form>
</div>
Then, add the Views/Shared/_SelectLanguagePartial.cshtml file is added to the footer section of the layout file so it will be available to all views:
<div class="container body-content" style="margin-top:60px">
#RenderBody()
<hr>
<footer>
<div class="row">
<div class="col-md-6">
<p>© #System.DateTime.Now.Year - Localization</p>
</div>
<div class="col-md-6 text-right">
#await Html.PartialAsync("_SelectLanguagePartial")
</div>
</div>
</footer>
</div>
Then, in Home Controller SetLanguage method, set the culture cookie.
[HttpPost]
public IActionResult SetLanguage(string culture, string returnUrl)
{
Response.Cookies.Append(
CookieRequestCultureProvider.DefaultCookieName,
CookieRequestCultureProvider.MakeCookieValue(new RequestCulture(culture)),
new CookieOptions { Expires = DateTimeOffset.UtcNow.AddYears(1) }
);
return LocalRedirect(returnUrl);
}
[Note] You can't plug in the _SelectLanguagePartial.cshtml to sample code for this project. The Localization.StarterWeb project on GitHub has code to flow the RequestLocalizationOptions to a Razor partial through the Dependency Injection container. Check the Startup.cs.