Add a .NET ChatApp example for AI configuration

examples/DotNetCore/ChatApp/ChatApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36119.2 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChatApp", "ChatApp\ChatApp.csproj", "{E7CB6AEC-C73D-4C9F-9A28-D728B47CF9EE}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E7CB6AEC-C73D-4C9F-9A28-D728B47CF9EE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E7CB6AEC-C73D-4C9F-9A28-D728B47CF9EE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E7CB6AEC-C73D-4C9F-9A28-D728B47CF9EE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E7CB6AEC-C73D-4C9F-9A28-D728B47CF9EE}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4228A6BE-DF14-40A7-8447-85FAF6249828}
+	EndGlobalSection
+EndGlobal

examples/DotNetCore/ChatApp/ChatApp/ChatApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Azure.AI.OpenAI" Version="2.1.0" />
+    <PackageReference Include="Azure.Identity" Version="1.14.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.AzureAppConfiguration" Version="8.2.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="9.0.5" />
+  </ItemGroup>
+
+</Project>

examples/DotNetCore/ChatApp/ChatApp/Message.cs

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+using Microsoft.Extensions.Configuration;
+
+namespace ChatApp
+{
+    internal class Message
+    {
+        [ConfigurationKeyName("role")]
+        public string Role { get; set; }
+
+        [ConfigurationKeyName("content")]
+        public string Content { get; set; }
+    }
+}

examples/DotNetCore/ChatApp/ChatApp/ModelConfiguration.cs

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+using Microsoft.Extensions.Configuration;
+using OpenAI.Chat;
+
+namespace ChatApp
+{
+    internal class ModelConfiguration
+    {
+        [ConfigurationKeyName("model")]
+        public string Model { get; set; }
+
+        [ConfigurationKeyName("messages")]
+        public List<Message> Messages { get; set; }
+
+        [ConfigurationKeyName("max_tokens")]
+        public int MaxTokens { get; set; }
+
+        [ConfigurationKeyName("temperature")]
+        public float Temperature { get; set; }
+
+        [ConfigurationKeyName("top_p")]
+        public float TopP { get; set; }
+
+        public IEnumerable<ChatMessage> ChatMessages =>
+            Messages.Select<Message, ChatMessage>(message => message.Role switch
+            {
+                "system" => ChatMessage.CreateSystemMessage(message.Content),
+                "user" => ChatMessage.CreateUserMessage(message.Content),
+                "assistant" => ChatMessage.CreateAssistantMessage(message.Content),
+                _ => throw new ArgumentException($"Unknown role: {message.Role}", nameof(message.Role))
+            });
+    }
+}

examples/DotNetCore/ChatApp/ChatApp/Program.cs

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+using Azure.AI.OpenAI;
+using Azure.Core;
+using Azure.Identity;
+using ChatApp;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration.AzureAppConfiguration;
+using OpenAI.Chat;
+
+TokenCredential credential = new DefaultAzureCredential();
+IConfigurationRefresher _refresher = null;
+
+// Load configuration from Azure App Configuration
+IConfiguration configuration = new ConfigurationBuilder()
+    .AddAzureAppConfiguration(options =>
+    {
+        Uri endpoint = new(Environment.GetEnvironmentVariable("AZURE_APPCONFIG_ENDPOINT") ??
+            throw new InvalidOperationException("The environment variable 'AZURE_APPCONFIG_ENDPOINT' is not set or is empty."));
+        options.Connect(endpoint, credential)
+               // Load all keys that have a specific prefix and no label.
+               .Select("ChatLLM:*")
+               // Reload configuration if any selected key-values have changed.
+               // Use the default refresh interval of 30 seconds. It can be overridden via refreshOptions.SetRefreshInterval.
+               .ConfigureRefresh(refreshOptions =>
+               {
+                   refreshOptions.RegisterAll()
+                                 .SetRefreshInterval(TimeSpan.FromSeconds(5));
+               });
+
+        _refresher = options.GetRefresher();
+    })
+    .Build();
+
+// Retrieve the model connection information from the configuration
+Uri chatEndpoint = new (configuration["ChatLLM:Endpoint"]);
+string deploymentName = configuration["ChatLLM:DeploymentName"];
+
+// Create a chat client
+AzureOpenAIClient azureClient = new(chatEndpoint, credential);
+ChatClient chatClient = azureClient.GetChatClient(deploymentName);
+
+while (true)
+{
+    // Refresh the configuration from Azure App Configuration
+    await _refresher.TryRefreshAsync();
+
+    // Configure chat completion with AI configuration
+    var modelConfig = configuration.GetSection("ChatLLM:Model").Get<ModelConfiguration>();
+    var requestOptions = new ChatCompletionOptions()
+    {
+        MaxOutputTokenCount = modelConfig.MaxTokens,
+        Temperature = modelConfig.Temperature,
+        TopP = modelConfig.TopP
+    };
+
+    foreach (var message in modelConfig.Messages)
+    {
+        Console.WriteLine($"{message.Role}: {message.Content}");
+    }
+
+    // Get chat response from AI
+    var response = chatClient.CompleteChat(modelConfig.ChatMessages, requestOptions);
+    System.Console.WriteLine($"AI response: {response.Value.Content[0].Text}");
+
+    Console.WriteLine("Press Enter to continue...");
+    Console.ReadLine();
+}