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c#azurehttpsharepointmicrosoft-graph-api

Why is @microsoft.graph.downloadUrl not populated in HTTP call but works with Graph SDK?

I am trying to fetch the @microsoft.graph.downloadUrl for items in a SharePoint list using a plain HTTP call to the Microsoft Graph API. However, the downloadUrl field is always returned as blank. Here is the HTTP request I am using:

GET https://graph.microsoft.com/v1.0/sites/{site-id}/lists/{list-id}/items?expand=driveItem(select=id,contentType,@microsoft.graph.downloadUrl)&$top=900

When I try the same request using the Microsoft Graph SDK, the downloadUrl is correctly populated:

var listItemsResponse = await graphServiceClient.Sites[site.Id].Lists[documentList.Id].Items.GetAsync((requestConfiguration) =>
{
    requestConfiguration.QueryParameters.Expand = new string[] { "driveItem" };
    requestConfiguration.QueryParameters.Select = new string[] { "id", "contentType" };
    requestConfiguration.QueryParameters.Top = 900;
});

bool hasDownloadUrl = driveItem.AdditionalData.TryGetValue("@microsoft.graph.downloadUrl", out object? downloadUrl);

enter image description here

Solution

  • Note that, @microsoft.graph.downloadUrl property won't be populated for SharePoint folders having content type as "Folder".

    I have one SharePoint site having one folder and few files of different types as below:

    enter image description here

    When I ran HTTP request, @microsoft.graph.downloadUrl property is not populated for testfolder as it's ContentType is "Folder" as below:

    GET https://graph.microsoft.com/v1.0/sites/siteId/lists/listId/items?expand=driveItem(select=id,@microsoft.graph.downloadUrl)&$top=500

    Response:

    enter image description here

    For remaining SharePoint files where ContentType is "Document", @microsoft.graph.downloadUrl property will be populated in response like this:

    GET https://graph.microsoft.com/v1.0/sites/siteId/lists/listId/items?expand=driveItem(select=id,@microsoft.graph.downloadUrl)&$top=500

    Response:

    enter image description here

    From your screenshot, you are not getting downloadUrl for drive item having ContentType as "Folder".