openaigraphsearch.cs

private static async Task<string> ExecuteMicrosoft365SearchWithGraph(string searchQuery)
{
    // To initialize your graphClient, see https://learn.microsoft.com/en-us/graph/sdks/create-client?from=snippets&tabs=csharp
    GraphServiceClient graphClient = GetGraphClient(["User.Read", "Files.Read.All"]);

    var requestBody = new QueryPostRequestBody
    {
        Requests = new List<SearchRequest>
        {
            new SearchRequest
            {
                EntityTypes = new List<EntityType?>
                {
                    EntityType.DriveItem,
                },
                Query = new SearchQuery
                {
                    QueryString = searchQuery,
                },
                From = 0,
                Size = 25,
            },
        },
    };

    
    var searchResults = await graphClient.Search.Query.PostAsQueryPostResponseAsync(requestBody);


    var result = string.Empty;

    foreach (var hit in searchResults.Value[0].HitsContainers[0].Hits)
    {
        var listItem = hit.Resource as DriveItem;
        if (listItem != null)
        {
            //Using the summary of the search result. In production, it might be the case that the summary is not enough.
            //In that situation, the solution could be to fetch the file contents through another graph call 
            result += hit.Summary;
        }
    }
    
    return result;
}