Example app for paramters object

examples/ParameterObjectConsoleApp/InMemoryFeatureDefinitionProvider.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
+using Microsoft.FeatureManagement;
+using Microsoft.FeatureManagement.FeatureFilters;
+namespace ParameterObjectConsoleApp
+{
+    /// <summary>
+    /// A custom feature definition provider that supplies targeting filter settings
+    /// directly using the ParametersObject property, avoiding the need to construct IConfiguration.
+    /// </summary>
+    public class InMemoryFeatureDefinitionProvider : IFeatureDefinitionProvider
+    {
+        private readonly Dictionary<string, FeatureDefinition> _featureDefinitions;
+
+        public InMemoryFeatureDefinitionProvider()
+        {
+            //
+            // Define feature flags with targeting settings.
+            // This demonstrates supplying filter parameters directly via ParametersObject
+            // instead of constructing an IConfiguration with key-value pairs.
+            _featureDefinitions = new Dictionary<string, FeatureDefinition>
+            {
+                ["Beta"] = new FeatureDefinition
+                {
+                    Name = "Beta",
+                    EnabledFor = new List<FeatureFilterConfiguration>
+                    {
+                        new FeatureFilterConfiguration
+                        {
+                            Name = "Microsoft.Targeting",
+                            ParametersObject = new TargetingFilterSettings
+                            {
+                                Audience = new Audience
+                                {
+                                    Users = new List<string> { "Jeff", "Anne" },
+                                    Groups = new List<GroupRollout>
+                                    {
+                                        new GroupRollout
+                                        {
+                                            Name = "Management",
+                                            RolloutPercentage = 100
+                                        },
+                                        new GroupRollout
+                                        {
+                                            Name = "TeamMembers",
+                                            RolloutPercentage = 45
+                                        }
+                                    },
+                                    DefaultRolloutPercentage = 20
+                                }
+                            }
+                        }
+                    }
+                }
+            };
+        }
+
+        public Task<FeatureDefinition> GetFeatureDefinitionAsync(string featureName)
+        {
+            _featureDefinitions.TryGetValue(featureName, out FeatureDefinition definition);
+
+            return Task.FromResult(definition);
+        }
+
+        public async IAsyncEnumerable<FeatureDefinition> GetAllFeatureDefinitionsAsync()
+        {
+            foreach (var definition in _featureDefinitions.Values)
+            {
+                yield return definition;
+            }
+
+            await Task.CompletedTask;
+        }
+    }
+}

examples/ParameterObjectConsoleApp/ParameterObjectConsoleApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="8.0.1" />
+    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="8.0.1" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Microsoft.FeatureManagement\Microsoft.FeatureManagement.csproj" />
+  </ItemGroup>
+
+</Project>

examples/ParameterObjectConsoleApp/Program.cs

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+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+//
+using Microsoft.FeatureManagement;
+using Microsoft.FeatureManagement.FeatureFilters;
+using ParameterObjectConsoleApp;
+
+//
+// Create a feature manager using a custom definition provider
+// that supplies targeting filter settings directly via ParametersObject.
+var featureManager = new FeatureManager(new InMemoryFeatureDefinitionProvider())
+{
+    FeatureFilters = new List<IFeatureFilterMetadata> { new ContextualTargetingFilter() }
+};
+
+//
+// Simulate evaluating the "Beta" feature for different users
+var users = new List<(string UserId, List<string> Groups)>
+{
+    ("Jeff", new List<string> { "TeamMembers" }),       // Targeted by user name
+    ("Anne", new List<string> { "Management" }),        // Targeted by user name
+    ("Sam", new List<string> { "Management" }),         // Targeted by group (100% rollout)
+    ("Alice", new List<string> { "TeamMembers" }),      // May be targeted by group (45% rollout)
+    ("Bob", new List<string> { "External" })            // Only targeted by default rollout (20%)
+};
+
+foreach (var (userId, groups) in users)
+{
+    const string FeatureName = "Beta";
+
+    var targetingContext = new TargetingContext
+    {
+        UserId = userId,
+        Groups = groups
+    };
+
+    bool enabled = await featureManager.IsEnabledAsync(FeatureName, targetingContext);
+
+    Console.WriteLine($"The {FeatureName} feature is {(enabled ? "enabled" : "disabled")} for the user '{userId}'.");
+}

examples/ParameterObjectConsoleApp/README.md

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+# ParametersObject Console App
+
+This example demonstrates how to use the `ParametersObject` property on `FeatureFilterConfiguration` to supply filter settings directly from a custom `IFeatureDefinitionProvider`.
+
+## Overview
+
+When implementing a custom `IFeatureDefinitionProvider` that sources feature definitions from alternative backends (e.g., databases, REST APIs), you no longer need to construct an `IConfiguration` object to pass filter parameters. Instead, you can assign settings like `TargetingFilterSettings` directly to `ParametersObject`.
+
+## Key Concept
+
+```csharp
+new FeatureFilterConfiguration
+{
+    Name = "Microsoft.Targeting",
+    ParametersObject = new TargetingFilterSettings
+    {
+        Audience = new Audience
+        {
+            Users = new List<string> { "Jeff", "Anne" },
+            Groups = new List<GroupRollout> { ... },
+            DefaultRolloutPercentage = 20
+        }
+    }
+}
+```
+
+This eliminates the need for verbose `IConfiguration` construction with magic string keys.
+
+## Running
+
+```
+dotnet run
+```