Add a builder API for configuring UseRequestLocalization

samples/LocalizationSample/Startup.cs

@@ -2,7 +2,6 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. 
 
 using System;
-using System.Collections.Generic;
 using System.Globalization;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
@@ -24,31 +23,19 @@ namespace LocalizationSample
 
         public void Configure(IApplicationBuilder app, IStringLocalizer<Startup> SR)
         {
-            var supportedCultures = new List<CultureInfo>
-            {
-                new CultureInfo("en-US"),
-                new CultureInfo("en-AU"),
-                new CultureInfo("en-GB"),
-                new CultureInfo("es-ES"),
-                new CultureInfo("ja-JP"),
-                new CultureInfo("fr-FR"),
-                new CultureInfo("zh"),
-                new CultureInfo("zh-CN")
-            };
-            var options = new RequestLocalizationOptions
-            {
-                DefaultRequestCulture = new RequestCulture("en-US"),
-                SupportedCultures = supportedCultures,
-                SupportedUICultures = supportedCultures
-            };
-            // Optionally create an app-specific provider with just a delegate, e.g. look up user preference from DB.
-            // Inserting it as position 0 ensures it has priority over any of the default providers.
-            //options.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(async context =>
-            //{
+            var supportedCultures = new [] { "en-US", "en-AU", "en-GB", "es-ES", "ja-JP", "fr-FR", "zh", "zh-CN" };
+            app.UseRequestLocalization(options =>
+                options
+                    .AddSupportedCultures(supportedCultures)
+                    .AddSupportedUICultures(supportedCultures)
+                    .SetDefaultCulture(supportedCultures[0])
+                  // Optionally create an app-specific provider with just a delegate, e.g. look up user preference from DB.
+                  // Inserting it as position 0 ensures it has priority over any of the default providers.
+                  //.RequestCultureProviders.Insert(0, new CustomRequestCultureProvider(async context =>
+                  //{
 
-            //}));
-
-            app.UseRequestLocalization(options);
+                 //}));
+            );
 
             app.Use(async (context, next) =>
             {

src/Microsoft.AspNetCore.Localization/ApplicationBuilderExtensions.cs

@@ -43,6 +43,7 @@ namespace Microsoft.AspNetCore.Builder
             {
                 throw new ArgumentNullException(nameof(app));
             }
+            
             if (options == null)
             {
                 throw new ArgumentNullException(nameof(options));
@@ -50,5 +51,69 @@ namespace Microsoft.AspNetCore.Builder
 
             return app.UseMiddleware<RequestLocalizationMiddleware>(Options.Create(options));
         }
+
+        /// <summary>
+        /// Adds the <see cref="RequestLocalizationMiddleware"/> to automatically set culture information for
+        /// requests based on information provided by the client. 
+        /// </summary>
+        /// <param name="app">The <see cref="IApplicationBuilder"/>.</param>
+        /// <param name="optionsAction"></param>
+        /// <returns>The <see cref="IApplicationBuilder"/>.</returns>
+        public static IApplicationBuilder UseRequestLocalization(
+            this IApplicationBuilder app,
+            Action<RequestLocalizationOptions> optionsAction)
+        {
+            if (app == null)
+            {
+                throw new ArgumentNullException(nameof(app));
+            }
+
+            if (optionsAction == null)
+            {
+                throw new ArgumentNullException(nameof(optionsAction));
+            }
+
+            var options = new RequestLocalizationOptions();
+            optionsAction.Invoke(options);
+
+            return app.UseMiddleware<RequestLocalizationMiddleware>(Options.Create(options));
+        }
+
+        /// <summary>
+        /// Adds the <see cref="RequestLocalizationMiddleware"/> to automatically set culture information for
+        /// requests based on information provided by the client. 
+        /// </summary>
+        /// <param name="app">The <see cref="IApplicationBuilder"/>.</param>
+        /// <param name="cultures">The culture names to be added by the application, which is represents both supported cultures and UI cultures.</param>
+        /// <returns>The <see cref="IApplicationBuilder"/>.</returns>
+        /// <remarks>
+        /// Note that the first culture is the default culture name.
+        /// </remarks>
+        public static IApplicationBuilder UseRequestLocalization(
+            this IApplicationBuilder app,
+            params string[] cultures)
+        {
+            if (app == null)
+            {
+                throw new ArgumentNullException(nameof(app));
+            }
+
+            if (cultures == null)
+            {
+                throw new ArgumentNullException(nameof(cultures));
+            }
+
+            if (cultures.Length == 0)
+            {
+                throw new ArgumentException(nameof(cultures));
+            }
+
+            var options = new RequestLocalizationOptions()
+                .AddSupportedCultures(cultures)
+                .AddSupportedUICultures(cultures)
+                .SetDefaultCulture(cultures[0]);
+
+            return app.UseMiddleware<RequestLocalizationMiddleware>(Options.Create(options));
+        }
     }
 }

src/Microsoft.AspNetCore.Localization/RequestLocalizationOptions.cs

@@ -109,5 +109,53 @@ namespace Microsoft.AspNetCore.Builder
         /// </list>
         /// </summary>
         public IList<IRequestCultureProvider> RequestCultureProviders { get; set; }
+
+        
+        /// <summary>
+        /// Adds the set of the supported cultures by the application.
+        /// </summary>
+        /// <param name="cultures">The cultures to be added.</param>
+        /// <returns>The <see cref="RequestLocalizationOptions"/>.</returns>
+        public RequestLocalizationOptions AddSupportedCultures(params string[] cultures)
+        {
+            var supportedCultures = new List<CultureInfo>();
+
+            foreach (var culture in cultures)
+            {
+                supportedCultures.Add(new CultureInfo(culture));
+            }
+
+            SupportedCultures = supportedCultures;
+            return this;
+        }
+
+        /// <summary>
+        /// Adds the set of the supported UI cultures by the application.
+        /// </summary>
+        /// <param name="uiCultures">The UI cultures to be added.</param>
+        /// <returns>The <see cref="RequestLocalizationOptions"/>.</returns>
+        public RequestLocalizationOptions AddSupportedUICultures(params string[] uiCultures)
+        {
+            var supportedUICultures = new List<CultureInfo>();
+            foreach (var culture in uiCultures)
+            {
+                supportedUICultures.Add(new CultureInfo(culture));
+            }
+
+            SupportedUICultures = supportedUICultures;
+            return this;
+        }
+
+        /// <summary>
+        /// Set the default culture to be used by the application when a supported culture could not be determined by
+        /// one of the configured <see cref="IRequestCultureProvider"/>s.
+        /// </summary>
+        /// <param name="defaultCulture">The default culture to be set.</param>
+        /// <returns>The <see cref="RequestLocalizationOptions"/>.</returns>
+        public RequestLocalizationOptions SetDefaultCulture(string defaultCulture)
+        {
+            DefaultRequestCulture = new RequestCulture(defaultCulture);
+            return this;
+        }
     }
 }