Multilingual in ASP.NET Core MVC 5

Sunday, 16/08/2020

Tram Ho

Prepare

.NET Core SDK 5.0
Visual Studio 2019 Community preview

Project initialization

File index.cshtml

@inject Microsoft.AspNetCore.Mvc.Localization.IViewLocalizer localizer

@{
    ViewData["Title"] = "Home Page";
}

&lt;div class="text-center"&gt;
    &lt;h1 class="display-4"&gt;@localizer["HelloWorld"]&lt;/h1&gt;
    &lt;p&gt;Learn about &lt;a href="https://docs.microsoft.com/aspnet/core"&gt;building Web apps with ASP.NET Core&lt;/a&gt;.&lt;/p&gt;
&lt;/div&gt;

@inject Microsoft.AspNetCore.Mvc.Localization.IViewLocalizer localizer

ViewData["Title"] = "Home Page";

}

<h1 class="display-4">@localizer["HelloWorld"]</h1>

Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.

</div>

File Startup.cs

<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>AspNetCore<span class="token punctuation">.</span>Builder</span><span class="token punctuation">;</span>
<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>AspNetCore<span class="token punctuation">.</span>Hosting</span><span class="token punctuation">;</span>
<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>AspNetCore<span class="token punctuation">.</span>Mvc<span class="token punctuation">.</span>Razor</span><span class="token punctuation">;</span>
<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>Extensions<span class="token punctuation">.</span>Configuration</span><span class="token punctuation">;</span>
<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>Extensions<span class="token punctuation">.</span>DependencyInjection</span><span class="token punctuation">;</span>
<span class="token keyword">using</span> <span class="token namespace">Microsoft<span class="token punctuation">.</span>Extensions<span class="token punctuation">.</span>Hosting</span><span class="token punctuation">;</span>

<span class="token keyword">namespace</span> <span class="token namespace">Localization</span>
<span class="token punctuation">{</span>

    <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Startup</span>
    <span class="token punctuation">{</span>
        <span class="token keyword">public</span> <span class="token function">Startup</span><span class="token punctuation">(</span><span class="token class-name">IConfiguration</span> configuration<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            Configuration <span class="token operator">=</span> configuration<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token return-type class-name">IConfiguration</span> Configuration <span class="token punctuation">{</span> <span class="token keyword">get</span><span class="token punctuation">;</span> <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token return-type class-name"><span class="token keyword">void</span></span> <span class="token function">ConfigureServices</span><span class="token punctuation">(</span><span class="token class-name">IServiceCollection</span> services<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            services<span class="token punctuation">.</span><span class="token function">AddLocalization</span><span class="token punctuation">(</span>opt <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> opt<span class="token punctuation">.</span>ResourcesPath <span class="token operator">=</span> <span class="token string">"Resources"</span><span class="token punctuation">;</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            services<span class="token punctuation">.</span><span class="token function">AddMvc</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">AddViewLocalization</span><span class="token punctuation">(</span>LanguageViewLocationExpanderFormat<span class="token punctuation">.</span>Suffix<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">AddDataAnnotationsLocalization</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            services<span class="token punctuation">.</span><span class="token function">AddControllersWithViews</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token keyword">public</span> <span class="token return-type class-name"><span class="token keyword">void</span></span> <span class="token function">Configure</span><span class="token punctuation">(</span><span class="token class-name">IApplicationBuilder</span> app<span class="token punctuation">,</span> <span class="token class-name">IWebHostEnvironment</span> env<span class="token punctuation">)</span>
        <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span>env<span class="token punctuation">.</span><span class="token function">IsDevelopment</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
            <span class="token punctuation">{</span>
                app<span class="token punctuation">.</span><span class="token function">UseDeveloperExceptionPage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  
            <span class="token punctuation">}</span>
            <span class="token keyword">else</span>
            <span class="token punctuation">{</span>
                app<span class="token punctuation">.</span><span class="token function">UseExceptionHandler</span><span class="token punctuation">(</span><span class="token string">"/Home/Error"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                app<span class="token punctuation">.</span><span class="token function">UseHsts</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            app<span class="token punctuation">.</span><span class="token function">UseHttpsRedirection</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            app<span class="token punctuation">.</span><span class="token function">UseStaticFiles</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            app<span class="token punctuation">.</span><span class="token function">UseRouting</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            app<span class="token punctuation">.</span><span class="token function">UseAuthorization</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token class-name"><span class="token keyword">var</span></span> supportedCultures <span class="token operator">=</span> <span class="token keyword">new</span><span class="token punctuation">[</span><span class="token punctuation">]</span> <span class="token punctuation">{</span> <span class="token string">"en"</span><span class="token punctuation">,</span> <span class="token string">"vi"</span><span class="token punctuation">}</span><span class="token punctuation">;</span>
            <span class="token class-name"><span class="token keyword">var</span></span> localizationOptions <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token constructor-invocation class-name">RequestLocalizationOptions</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">SetDefaultCulture</span><span class="token punctuation">(</span>supportedCultures<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
                <span class="token punctuation">.</span><span class="token function">AddSupportedCultures</span><span class="token punctuation">(</span>supportedCultures<span class="token punctuation">)</span>
                <span class="token punctuation">.</span><span class="token function">AddSupportedUICultures</span><span class="token punctuation">(</span>supportedCultures<span class="token punctuation">)</span><span class="token punctuation">;</span>
            app<span class="token punctuation">.</span><span class="token function">UseRequestLocalization</span><span class="token punctuation">(</span>localizationOptions<span class="token punctuation">)</span><span class="token punctuation">;</span>
            app<span class="token punctuation">.</span><span class="token function">UseEndpoints</span><span class="token punctuation">(</span>endpoints <span class="token operator">=&gt;</span>
            <span class="token punctuation">{</span>
                endpoints<span class="token punctuation">.</span><span class="token function">MapControllerRoute</span><span class="token punctuation">(</span>
                    <span class="token named-parameter punctuation">name</span><span class="token punctuation">:</span> <span class="token string">"default"</span><span class="token punctuation">,</span>
                    <span class="token named-parameter punctuation">pattern</span><span class="token punctuation">:</span> <span class="token string">"{controller=Home}/{action=Index}/{id?}"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>

<span class="token punctuation">}</span>

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Hosting;

using Microsoft.AspNetCore.Mvc.Razor;

using Microsoft.Extensions.Configuration;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

namespace Localization

{

public class Startup

{

public Startup(IConfiguration configuration)

{

Configuration = configuration;

}

public IConfiguration Configuration { get; }

public void ConfigureServices(IServiceCollection services)

{

services.AddLocalization(opt => { opt.ResourcesPath = "Resources"; });

services.AddMvc().AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix).AddDataAnnotationsLocalization();

services.AddControllersWithViews();

}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

{

if (env.IsDevelopment())

{

app.UseDeveloperExceptionPage();

}

else

{

app.UseExceptionHandler("/Home/Error");

app.UseHsts();

}

app.UseHttpsRedirection();

app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

var supportedCultures = new[] { "en", "vi"};

var localizationOptions = new RequestLocalizationOptions().SetDefaultCulture(supportedCultures[0])

.AddSupportedCultures(supportedCultures)

.AddSupportedUICultures(supportedCultures);

app.UseRequestLocalization(localizationOptions);

app.UseEndpoints(endpoints =>

{

endpoints.MapControllerRoute(

name: "default",

pattern: "{controller=Home}/{action=Index}/{id?}");

});

}

Source code: https://github.com/donhuvy/aspnetcore5_localization

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