Do not use DI for console app example (#528)

* not use DI for console app example

* update console targeting example

* simlify example

Author: zhiyuanliang-ms

examples/ConsoleApp/Program.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT license.
 //
 using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
 using Microsoft.FeatureManagement;
 
 //
@@ -11,45 +10,35 @@
     .AddJsonFile("appsettings.json")
     .Build();
 
-//
-// Setup application services + feature management
-IServiceCollection services = new ServiceCollection();
+var featureManager = new FeatureManager(new ConfigurationFeatureDefinitionProvider(configuration))
+{
+    FeatureFilters = new List<IFeatureFilterMetadata> { new AccountIdFilter() }
+};
 
-services.AddSingleton(configuration)
-        .AddFeatureManagement()
-        .AddFeatureFilter<AccountIdFilter>();
+var accounts = new List<string>()
+{
+    "abc",
+    "adef",
+    "abcdefghijklmnopqrstuvwxyz"
+};
 
 //
-// Get the feature manager from application services
-using (ServiceProvider serviceProvider = services.BuildServiceProvider())
+// Mimic work items in a task-driven console application
+foreach (var account in accounts)
 {
-    IFeatureManager featureManager = serviceProvider.GetRequiredService<IFeatureManager>();
-
-    var accounts = new List<string>()
-    {
-        "abc",
-        "adef",
-        "abcdefghijklmnopqrstuvwxyz"
-    };
+    const string FeatureName = "Beta";
 
     //
-    // Mimic work items in a task-driven console application
-    foreach (var account in accounts)
+    // Check if feature enabled
+    //
+    var accountServiceContext = new AccountServiceContext
     {
-        const string FeatureName = "Beta";
-
-        //
-        // Check if feature enabled
-        //
-        var accountServiceContext = new AccountServiceContext
-        {
-            AccountId = account
-        };
+        AccountId = account
+    };
 
-        bool enabled = await featureManager.IsEnabledAsync(FeatureName, accountServiceContext);
+    bool enabled = await featureManager.IsEnabledAsync(FeatureName, accountServiceContext);
 
-        //
-        // Output results
-        Console.WriteLine($"The {FeatureName} feature is {(enabled ? "enabled" : "disabled")} for the '{account}' account.");
-    }
+    //
+    // Output results
+    Console.WriteLine($"The {FeatureName} feature is {(enabled ? "enabled" : "disabled")} for the '{account}' account.");
 }

examples/TargetingConsoleApp/Program.cs

@@ -1,5 +1,7 @@
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.DependencyInjection;
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
+using Microsoft.Extensions.Configuration;
 using Microsoft.FeatureManagement;
 using Microsoft.FeatureManagement.FeatureFilters;
 using TargetingConsoleApp.Identity;
@@ -10,48 +12,39 @@
     .AddJsonFile("appsettings.json")
     .Build();
 
-//
-// Setup application services + feature management
-IServiceCollection services = new ServiceCollection();
-
-services.AddSingleton(configuration)
-        .AddFeatureManagement();
+var featureManager = new FeatureManager(new ConfigurationFeatureDefinitionProvider(configuration))
+{
+    FeatureFilters = new List<IFeatureFilterMetadata> { new ContextualTargetingFilter() }
+};
 
 var userRepository = new InMemoryUserRepository();
 
 //
-// Get the feature manager from application services
-using (ServiceProvider serviceProvider = services.BuildServiceProvider())
+// We'll simulate a task to run on behalf of each known user
+// To do this we enumerate all the users in our user repository
+IEnumerable<string> userIds = InMemoryUserRepository.Users.Select(u => u.Id);
+
+//
+// Mimic work items in a task-driven console application
+foreach (string userId in userIds)
 {
-    IFeatureManager featureManager = serviceProvider.GetRequiredService<IFeatureManager>();
+    const string FeatureName = "Beta";
 
     //
-    // We'll simulate a task to run on behalf of each known user
-    // To do this we enumerate all the users in our user repository
-    IEnumerable<string> userIds = InMemoryUserRepository.Users.Select(u => u.Id);
+    // Get user
+    User user = await userRepository.GetUser(userId);
 
     //
-    // Mimic work items in a task-driven console application
-    foreach (string userId in userIds)
+    // Check if feature enabled
+    var targetingContext = new TargetingContext
     {
-        const string FeatureName = "Beta";
-
-        //
-        // Get user
-        User user = await userRepository.GetUser(userId);
-
-        //
-        // Check if feature enabled
-        var targetingContext = new TargetingContext
-        {
-            UserId = user.Id,
-            Groups = user.Groups
-        };
-
-        bool enabled = await featureManager.IsEnabledAsync(FeatureName, targetingContext);
-
-        //
-        // Output results
-        Console.WriteLine($"The {FeatureName} feature is {(enabled ? "enabled" : "disabled")} for the user '{userId}'.");
-    }
+        UserId = user.Id,
+        Groups = user.Groups
+    };
+
+    bool enabled = await featureManager.IsEnabledAsync(FeatureName, targetingContext);
+
+    //
+    // Output results
+    Console.WriteLine($"The {FeatureName} feature is {(enabled ? "enabled" : "disabled")} for the user '{userId}'.");
 }