├── .gitattributes ├── .gitignore ├── JSONLocalization.NET.sln ├── JSONLocalization.NET ├── Controllers │ └── DemoController.cs ├── JSONLocalization.NET.csproj ├── JsonStringLocalizer.cs ├── JsonStringLocalizerFactory.cs ├── LocalizationMiddleware.cs ├── Program.cs ├── Properties │ └── launchSettings.json ├── Resources │ ├── de-DE.json │ └── en-US.json ├── Startup.cs ├── appsettings.Development.json └── appsettings.json └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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2 | using Microsoft.Extensions.Localization; 3 | using Microsoft.Extensions.Logging; 4 | using System; 5 | using System.Collections.Generic; 6 | using System.Linq; 7 | using System.Threading.Tasks; 8 | 9 | namespace JSONLocalization.NET.Controllers 10 | { 11 | [ApiController] 12 | [Route("[controller]")] 13 | public class DemoController : ControllerBase 14 | { 15 | 16 | private readonly ILogger _logger; 17 | private readonly IStringLocalizer _loc; 18 | public DemoController(ILogger logger, IStringLocalizer loc) 19 | { 20 | _logger = logger; 21 | _loc = loc; 22 | } 23 | [HttpGet] 24 | public IActionResult Get() 25 | { 26 | _logger.LogInformation(_loc["hi"]); 27 | var message = _loc["hi"].ToString(); 28 | return Ok(message); 29 | } 30 | [HttpGet("{name}")] 31 | public IActionResult Get(string name) 32 | { 33 | var message = string.Format(_loc["welcome"], name); 34 | return Ok(message); 35 | } 36 | [HttpGet("all")] 37 | public IActionResult GetAll() 38 | { 39 | var message = _loc.GetAllStrings(); 40 | return Ok(message); 41 | } 42 | } 43 | } 44 | -------------------------------------------------------------------------------- /JSONLocalization.NET/JSONLocalization.NET.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net5.0 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | -------------------------------------------------------------------------------- /JSONLocalization.NET/JsonStringLocalizer.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Caching.Distributed; 2 | using Microsoft.Extensions.Localization; 3 | using Newtonsoft.Json; 4 | using Newtonsoft.Json.Linq; 5 | using System.Collections.Generic; 6 | using System.Globalization; 7 | using System.IO; 8 | using System.Threading; 9 | 10 | namespace JSONLocalization.NET 11 | { 12 | public class JsonStringLocalizer : IStringLocalizer 13 | { 14 | 15 | private readonly IDistributedCache _cache; 16 | 17 | private readonly JsonSerializer _serializer = new JsonSerializer(); 18 | 19 | public JsonStringLocalizer(IDistributedCache cache) 20 | { 21 | _cache = cache; 22 | } 23 | 24 | public LocalizedString this[string name] 25 | { 26 | get 27 | { 28 | string value = GetString(name); 29 | return new LocalizedString(name, value ?? name, value == null); 30 | } 31 | } 32 | 33 | public LocalizedString this[string name, params object[] arguments] 34 | { 35 | get 36 | { 37 | var actualValue = this[name]; 38 | return !actualValue.ResourceNotFound 39 | ? new LocalizedString(name, string.Format(actualValue.Value, arguments), false) 40 | : actualValue; 41 | } 42 | } 43 | 44 | public IEnumerable GetAllStrings(bool includeParentCultures) 45 | { 46 | string filePath = $"Resources/{Thread.CurrentThread.CurrentCulture.Name}.json"; 47 | using (var str = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read)) 48 | using (var sReader = new StreamReader(str)) 49 | using (var reader = new JsonTextReader(sReader)) 50 | { 51 | while (reader.Read()) 52 | { 53 | if (reader.TokenType != JsonToken.PropertyName) 54 | continue; 55 | string key = (string)reader.Value; 56 | reader.Read(); 57 | string value = _serializer.Deserialize(reader); 58 | yield return new LocalizedString(key, value, false); 59 | } 60 | } 61 | } 62 | 63 | private string GetString(string key) 64 | { 65 | string relativeFilePath = $"Resources/{Thread.CurrentThread.CurrentCulture.Name}.json"; 66 | string fullFilePath = Path.GetFullPath(relativeFilePath); 67 | if (File.Exists(fullFilePath)) 68 | { 69 | string cacheKey = $"locale_{Thread.CurrentThread.CurrentCulture.Name}_{key}"; 70 | string cacheValue = _cache.GetString(cacheKey); 71 | if (!string.IsNullOrEmpty(cacheValue)) return cacheValue; 72 | string result = GetValueFromJSON(key, Path.GetFullPath(relativeFilePath)); 73 | if (!string.IsNullOrEmpty(result)) _cache.SetString(cacheKey, result); 74 | return result; 75 | } 76 | 77 | return default(string); 78 | } 79 | 80 | private string GetValueFromJSON(string propertyName, string filePath) 81 | { 82 | if (propertyName == null) return default; 83 | if (filePath == null) return default; 84 | using (var str = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read)) 85 | using (var sReader = new StreamReader(str)) 86 | using (var reader = new JsonTextReader(sReader)) 87 | { 88 | while (reader.Read()) 89 | { 90 | if (reader.TokenType == JsonToken.PropertyName && (string)reader.Value == propertyName) 91 | { 92 | reader.Read(); 93 | return _serializer.Deserialize(reader); 94 | } 95 | } 96 | 97 | return default; 98 | } 99 | } 100 | } 101 | } -------------------------------------------------------------------------------- /JSONLocalization.NET/JsonStringLocalizerFactory.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Caching.Distributed; 2 | using Microsoft.Extensions.Localization; 3 | using System; 4 | 5 | namespace JSONLocalization.NET 6 | { 7 | public class JsonStringLocalizerFactory : IStringLocalizerFactory 8 | { 9 | private readonly IDistributedCache _cache; 10 | 11 | public JsonStringLocalizerFactory(IDistributedCache cache) 12 | { 13 | _cache = cache; 14 | } 15 | 16 | public IStringLocalizer Create(Type resourceSource) => 17 | new JsonStringLocalizer(_cache); 18 | 19 | public IStringLocalizer Create(string baseName, string location) => 20 | new JsonStringLocalizer(_cache); 21 | } 22 | } 23 | -------------------------------------------------------------------------------- /JSONLocalization.NET/LocalizationMiddleware.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.AspNetCore.Http; 2 | using System; 3 | using System.Globalization; 4 | using System.Linq; 5 | using System.Threading; 6 | using System.Threading.Tasks; 7 | 8 | namespace JSONLocalization.NET 9 | { 10 | public class LocalizationMiddleware : IMiddleware 11 | { 12 | public async Task InvokeAsync(HttpContext context, RequestDelegate next) 13 | { 14 | var cultureKey = context.Request.Headers["Accept-Language"]; 15 | if (!string.IsNullOrEmpty(cultureKey)) 16 | { 17 | if (DoesCultureExist(cultureKey)) 18 | { 19 | var culture = new System.Globalization.CultureInfo(cultureKey); 20 | Thread.CurrentThread.CurrentCulture = culture; 21 | Thread.CurrentThread.CurrentUICulture = culture; 22 | } 23 | } 24 | 25 | await next(context); 26 | } 27 | 28 | private static bool DoesCultureExist(string cultureName) 29 | { 30 | return CultureInfo.GetCultures(CultureTypes.AllCultures).Any(culture => string.Equals(culture.Name, cultureName, StringComparison.CurrentCultureIgnoreCase)); 31 | } 32 | } 33 | } 34 | -------------------------------------------------------------------------------- /JSONLocalization.NET/Program.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.AspNetCore.Hosting; 2 | using Microsoft.Extensions.Configuration; 3 | using Microsoft.Extensions.Hosting; 4 | using Microsoft.Extensions.Logging; 5 | using System; 6 | using System.Collections.Generic; 7 | using System.Linq; 8 | using System.Threading.Tasks; 9 | 10 | namespace JSONLocalization.NET 11 | { 12 | public class Program 13 | { 14 | public static void Main(string[] args) 15 | { 16 | CreateHostBuilder(args).Build().Run(); 17 | } 18 | 19 | public static IHostBuilder CreateHostBuilder(string[] args) => 20 | Host.CreateDefaultBuilder(args) 21 | .ConfigureWebHostDefaults(webBuilder => 22 | { 23 | webBuilder.UseStartup(); 24 | }); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /JSONLocalization.NET/Properties/launchSettings.json: -------------------------------------------------------------------------------- 1 | { 2 | "$schema": "http://json.schemastore.org/launchsettings.json", 3 | "iisSettings": { 4 | "windowsAuthentication": false, 5 | "anonymousAuthentication": true, 6 | "iisExpress": { 7 | "applicationUrl": "http://localhost:50770", 8 | "sslPort": 44376 9 | } 10 | }, 11 | "profiles": { 12 | "IIS Express": { 13 | "commandName": "IISExpress", 14 | "launchBrowser": true, 15 | "launchUrl": "swagger", 16 | "environmentVariables": { 17 | "ASPNETCORE_ENVIRONMENT": "Development" 18 | } 19 | }, 20 | "JSONLocalization.NET": { 21 | "commandName": "Project", 22 | "dotnetRunMessages": "true", 23 | "launchBrowser": true, 24 | "launchUrl": "swagger", 25 | "applicationUrl": "https://localhost:5001;http://localhost:5000", 26 | "environmentVariables": { 27 | "ASPNETCORE_ENVIRONMENT": "Development" 28 | } 29 | } 30 | } 31 | } 32 | -------------------------------------------------------------------------------- /JSONLocalization.NET/Resources/de-DE.json: -------------------------------------------------------------------------------- 1 | { 2 | "hi": "Hallo", 3 | "welcome": "Willkommen {0}, wie geht es dir?" 4 | } -------------------------------------------------------------------------------- /JSONLocalization.NET/Resources/en-US.json: -------------------------------------------------------------------------------- 1 | { 2 | "hi": "Hello", 3 | "welcome": "Welcome {0}, How are you?" 4 | } -------------------------------------------------------------------------------- /JSONLocalization.NET/Startup.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.AspNetCore.Builder; 2 | using Microsoft.AspNetCore.Hosting; 3 | using Microsoft.AspNetCore.Localization; 4 | using Microsoft.Extensions.Configuration; 5 | using Microsoft.Extensions.DependencyInjection; 6 | using Microsoft.Extensions.Hosting; 7 | using Microsoft.Extensions.Localization; 8 | using Microsoft.OpenApi.Models; 9 | using System.Globalization; 10 | 11 | namespace JSONLocalization.NET 12 | { 13 | public class Startup 14 | { 15 | public Startup(IConfiguration configuration) 16 | { 17 | Configuration = configuration; 18 | } 19 | 20 | public IConfiguration Configuration { get; } 21 | 22 | // This method gets called by the runtime. Use this method to add services to the container. 23 | public void ConfigureServices(IServiceCollection services) 24 | { 25 | services.AddLocalization(); 26 | services.AddSingleton(); 27 | services.AddDistributedMemoryCache(); 28 | services.AddSingleton(); 29 | services.AddControllers(); 30 | services.AddSwaggerGen(c => 31 | { 32 | c.SwaggerDoc("v1", new OpenApiInfo { Title = "JSONLocalization.NET", Version = "v1" }); 33 | }); 34 | } 35 | 36 | // This method gets called by the runtime. Use this method to configure the HTTP request pipeline. 37 | public void Configure(IApplicationBuilder app, IWebHostEnvironment env) 38 | { 39 | var options = new RequestLocalizationOptions 40 | { 41 | DefaultRequestCulture = new RequestCulture(new CultureInfo("en-US")) 42 | }; 43 | app.UseRequestLocalization(options); 44 | app.UseStaticFiles(); 45 | app.UseMiddleware(); 46 | if (env.IsDevelopment()) 47 | { 48 | app.UseDeveloperExceptionPage(); 49 | app.UseSwagger(); 50 | app.UseSwaggerUI(c => c.SwaggerEndpoint("/swagger/v1/swagger.json", "JSONLocalization.NET v1")); 51 | } 52 | 53 | app.UseHttpsRedirection(); 54 | 55 | app.UseRouting(); 56 | 57 | app.UseAuthorization(); 58 | 59 | app.UseEndpoints(endpoints => 60 | { 61 | endpoints.MapControllers(); 62 | }); 63 | } 64 | } 65 | } 66 | -------------------------------------------------------------------------------- /JSONLocalization.NET/appsettings.Development.json: -------------------------------------------------------------------------------- 1 | { 2 | "Logging": { 3 | "LogLevel": { 4 | "Default": "Information", 5 | "Microsoft": "Warning", 6 | "Microsoft.Hosting.Lifetime": "Information" 7 | } 8 | } 9 | } 10 | -------------------------------------------------------------------------------- /JSONLocalization.NET/appsettings.json: -------------------------------------------------------------------------------- 1 | { 2 | "Logging": { 3 | "LogLevel": { 4 | "Default": "Information", 5 | "Microsoft": "Warning", 6 | "Microsoft.Hosting.Lifetime": "Information" 7 | } 8 | }, 9 | "AllowedHosts": "*" 10 | } 11 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # JSON Based Localization in ASP.NET Core 2 | 3 | In this article, we are going to learn how to implement JSON Based Localization in ASP.NET Core and club it with Caching to make it even more efficient. Let's use JSON files to store the localized strings and implement middleware to switch languages via language keys in the request header. It will be as simple as adding 3 new classes and a couple of service registrations. 4 | 5 | Read the article - https://codewithmukesh.com/blog/json-based-localization-in-aspnet-core/ 6 | --------------------------------------------------------------------------------