Azure AI Foundry Auth using Entra ID in C#

Program.cs

using Microsoft.Extensions.Configuration;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using Microsoft.SemanticKernel.Connectors.OpenAI;
using Azure.Identity;

string filePath = Path.GetFullPath("appsettings.json");
var config = new ConfigurationBuilder()
    .AddJsonFile(filePath)
    .Build();

// Set your values in appsettings.json
string endpoint = config["PROJECT_ENDPOINT"]!;
string deploymentName = config["DEPLOYMENT_NAME"]!;

// Create DefaultAzureCredential for managed identity authentication
var credential = new DefaultAzureCredential();

// Create a kernel with Azure OpenAI chat completion
var builder = Kernel.CreateBuilder();
builder.AddAzureOpenAIChatCompletion(deploymentName, endpoint, credential);

// app.settings.json template:
//{
//  "PROJECT_ENDPOINT": "https://<project-name>.cognitiveservices.azure.com/",
//  "DEPLOYMENT_NAME": "<name>"
//}