added .net core 3.0

Author: Cam Soper

articles/azure-app-configuration/concept-disaster-recovery.md

@@ -24,6 +24,8 @@ Your application loads its configuration from both the primary and secondary sto
 
 Technically, your application isn't executing a failover. It's attempting to retrieve the same set of configuration data from two App Configuration stores simultaneously. Arrange your code so that it loads from the secondary store first and then the primary store. This approach ensures that the configuration data in the primary store takes precedence whenever it's available. The following code snippet shows how you can implement this arrangement in the .NET Core CLI:
 
+#### [.NET Core 2.x](#tab/core2x)
+
 ```csharp
 public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
     WebHost.CreateDefaultBuilder(args)
@@ -37,6 +39,22 @@ public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
     }
 ```
 
+#### [.NET Core 3.x](#tab/core3x)
+
+```csharp
+public static IHostBuilder CreateHostBuilder(string[] args) =>
+    Host.CreateDefaultBuilder(args)
+        .ConfigureWebHostDefaults(webBuilder =>
+            webBuilder.ConfigureAppConfiguration((hostingContext, config) =>
+            {
+                var settings = config.Build();
+                config.AddAzureAppConfiguration(settings["ConnectionString_SecondaryStore"], optional: true)
+                    .AddAzureAppConfiguration(settings["ConnectionString_PrimaryStore"], optional: true);
+            })
+        .UseStartup<Startup>());
+```
+---
+
 Notice the `optional` parameter passed into the `AddAzureAppConfiguration` function. When set to `true`, this parameter prevents the application from failing to continue if the function can't load configuration data.
 
 ## Synchronization between configuration stores

articles/azure-app-configuration/enable-dynamic-configuration-aspnet-core.md

@@ -50,11 +50,13 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
 1. Add a reference to the `Microsoft.Azure.AppConfiguration.AspNetCore` NuGet package by running the following command:
 
     ```CLI
-        dotnet add package Microsoft.Azure.AppConfiguration.AspNetCore --version 2.0.0-preview-010060003-1250
+    dotnet add package Microsoft.Azure.AppConfiguration.AspNetCore --version 3.0.0-preview-010560002-1165
     ```
 
 1. Open *Program.cs*, and update the `CreateWebHostBuilder` method to add the `config.AddAzureAppConfiguration()` method.
 
+    #### [.NET Core 2.x](#tab/core2x)
+
     ```csharp
     public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
         WebHost.CreateDefaultBuilder(args)
@@ -76,6 +78,30 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
             .UseStartup<Startup>();
     ```
 
+    #### [.NET Core 3.x](#tab/core3x)
+
+    ```csharp
+    public static IHostBuilder CreateHostBuilder(string[] args) =>
+        Host.CreateDefaultBuilder(args)
+            .ConfigureWebHostDefaults(webBuilder =>
+                webBuilder.ConfigureAppConfiguration((hostingContext, config) =>
+                {
+                    var settings = config.Build();
+                    config.AddAzureAppConfiguration(options =>
+                    {   
+                        options.Connect(settings["ConnectionStrings:AppConfig"])
+                            .ConfigureRefresh(refresh =>
+                                {
+                                    refresh.Register("TestApp:Settings:BackgroundColor")
+                                            .Register("TestApp:Settings:FontColor")
+                                            .Register("TestApp:Settings:Message");
+                                });
+                    });
+                })
+            .UseStartup<Startup>());
+    ```
+    ---
+
     The `ConfigureRefresh` method is used to specify the settings used to update the configuration data with the App Configuration store when a refresh operation is triggered. In order to actually trigger a refresh operation, a refresh middleware needs to be configured for the application to refresh the configuration data when any change occurs.
 
 2. Add a *Settings.cs* file that defines and implements a new `Settings` class.
@@ -93,24 +119,33 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
     }
     ```
 
-3. Open *Startup.cs*, and update the `ConfigureServices` method to bind configuration data to the `Settings` class.
+3. Open *Startup.cs*, and use `IServiceCollection.Configure<T>` in the `ConfigureServices` method to bind configuration data to the `Settings` class.
+
+    #### [.NET Core 2.x](#tab/core2x)
 
     ```csharp
     public void ConfigureServices(IServiceCollection services)
     {
         services.Configure<Settings>(Configuration.GetSection("TestApp:Settings"));
+        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+    }
+    ```
 
-        services.Configure<CookiePolicyOptions>(options =>
-        {
-            options.CheckConsentNeeded = context => true;
-            options.MinimumSameSitePolicy = SameSiteMode.None;
-        });
+    #### [.NET Core 3.x](#tab/core3x)
 
-        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+    ```csharp
+    public void ConfigureServices(IServiceCollection services)
+    {
+        services.Configure<Settings>(Configuration.GetSection("TestApp:Settings"));
+        services.AddControllersWithViews();
     }
     ```
+    ---
+
+4. Update the `Configure` method, adding the `UseAzureAppConfiguration` middleware to allow the configuration settings registered for refresh to be updated while the ASP.NET Core web app continues to receive requests.
 
-4. Update the `Configure` method to add a middleware to allow the configuration settings registered for refresh to be updated while the ASP.NET Core web app continues to receive requests.
+
+    #### [.NET Core 2.x](#tab/core2x)
 
     ```csharp
     public void Configure(IApplicationBuilder app, IHostingEnvironment env)
@@ -119,6 +154,43 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
         app.UseMvc();
     }
     ```
+
+    #### [.NET Core 3.x](#tab/core3x)
+
+    ```csharp
+    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+    {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                app.UseHsts();
+            }
+
+            // Add the following line:
+            app.UseAzureAppConfiguration();
+
+            app.UseHttpsRedirection();
+            
+            app.UseStaticFiles();
+
+            app.UseRouting();
+
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllerRoute(
+                    name: "default",
+                    pattern: "{controller=Home}/{action=Index}/{id?}");
+            });
+    }
+    ```
+    ---
     
     The middleware uses the refresh configuration specified in the `AddAzureAppConfiguration` method in `Program.cs` to trigger a refresh for each request received by the ASP.NET Core web app. For each request, a refresh operation is triggered and the client library checks if the cached value for the registered configuration settings have expired. For the cached values that have expired, the values for the settings are updated with the App Configuration store, and the remaining values remain unchanged.
     
@@ -135,6 +207,8 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
 
 2. Update the `HomeController` class to receive `Settings` through dependency injection, and make use of its values.
 
+    #### [.NET Core 2.x](#tab/core2x)
+
     ```csharp
     public class HomeController : Controller
     {
@@ -156,6 +230,37 @@ Before you continue, finish [Create an ASP.NET Core app with App Configuration](
     }
     ```
 
+    #### [.NET Core 3.x](#tab/core3x)
+
+    ```csharp
+    public class HomeController : Controller
+    {
+        private readonly Settings _settings;
+        private readonly ILogger<HomeController> _logger;
+
+        public HomeController(ILogger<HomeController> logger, IOptionsSnapshot<Settings> settings)
+        {
+            _logger = logger;
+            _settings = settings.Value;
+        }
+
+        public IActionResult Index()
+        {
+            ViewData["BackgroundColor"] = _settings.BackgroundColor;
+            ViewData["FontSize"] = _settings.FontSize;
+            ViewData["FontColor"] = _settings.FontColor;
+            ViewData["Message"] = _settings.Message;
+
+            return View();
+        }
+
+        // ...
+    }
+    ```
+    ---
+
+
+
 3. Open *Index.cshtml* in the Views > Home directory, and replace its content with the following script:
 
     ```html