Using MS Graph to Read Excel Contents Through Sharepoint

Question

I'm attempting to use MS Graph to parse the contents of excel files and sync the data with other business-line applications. The issue I'm running into is actually getting at the data in excel.

I'm using a ClientCredentialProvider authenticating to an Azure AD App Registration which has FullControl and Read.All permissions in my tenant to create my GraphServiceClient , and can successfully query the Site via ID, and even see the document library I'm trying to access, but the Items comes up empty. See below

var result = _graphService.Client
                .Sites["my-site-id"] // This works                
                .Drives["site-drive-id"] // This works to find the document library
                //.Lists["list-id-corresponding-to-folder"] // This also works to find that folder
                .Items // ****This is null****
                .Request()
                .GetAsync()
                .Result;

I tried using the Lists property (as noted above) because as I understand it document libraries in SharePoint are really just lists, but again the Items enumeration yields no results.

I can't find documentation on Microsoft's site on this use case, and I notice using the MS Graph Explorer that the returned object doesn't have an "items" field (or many properties in the Microsoft.Graph.Site class), but I would think there is some way to get this field populated since it's implemented in the Microsoft.Graph namespace. Not sure if I'm missing some permissions step or what, but if I can access the site with FullControl I should be able to access all its contents...

I can't use Client.Me (personal drive) as a source location because 1) the application doesn't run under my permissions and 2) there is a need to read multiple files; the idea would be just provide the needed site/drive/item ID's and get the documents.

Is there some other way I should be going about this?

Answer 1

@broccoli_rob,

MS Graph has not exposed the functionality of enumerating all items in a drive. Instead, you can only list children or get item by id .

We suggest you use /drive/root:/{item-path} to get items in a folder. And you can vaild the endpoint in Graph explorer:

BR