Search Files with Graph SDK

Hi @APIPointNewbie , this is my code and my test result. Pls note that you need to give the api permission in azure portal before, here I used client credential flow, so I set application permission but not delegate permission.

using Azure.Identity;  
using Microsoft.AspNetCore.Mvc;  
using Microsoft.Graph;  
using System.Linq;  
using System.Threading.Tasks;  
  
namespace WebApplication3.Controllers  
{  
    public class HomeController : Controller  
    {  
        public IActionResult Index()  
        {  
            return View();  
        }  
  
        public async Task<string> testAsync() {  
            var def = new[] { "https://graph.microsoft.com/.default" };  
            var tenantId = "tenant_name.onmicrosoft.com";  
            var clientId = "azure_ad_app_id_here";  
            var clientSecret = "client_secret_here";  
  
            var options = new TokenCredentialOptions  
            {  
                AuthorityHost = AzureAuthorityHosts.AzurePublicCloud  
            };  
            var clientSecretCredential = new ClientSecretCredential(tenantId, clientId, clientSecret, options);  
            var graphClient = new GraphServiceClient(clientSecretCredential, def);  
            DriveItemSearchCollectionPage a = (DriveItemSearchCollectionPage)await graphClient.Users["my_user_id"].Drive.Root.Search("win-arm").Request().GetAsync();  
            return a.FirstOrDefault<DriveItem>().Name;  
        }  
    }  
}  

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Best Regards,
TinyWang