I’m still at the beginning level, and my question may be a little naive.

Both HttpClient and directly calling class methods can request data from the server, so why use HttpClient instead of class methods?

e.g.

backend:

public Class DataService
{
    private readonly DataContext _db;
    
    public DataService(DataContext db)
    {
        _db = db;
    }
    
    public async Task<List<Datas>> GetDatasAsync()
    {
        return await _db.Datas.ToListAsync();
    }
    
    [HttpGet]
    public async Task<ActionResult<List<Datas>>> GetDatasHttpAsync()
    {
        return await _db.Datas.ToListAsync();
    }
}

fontend:

HttpClient:
httpDatas = await HttpClient.GetFromJsonAsyncList<Datas>(NavigationManager.BaseUri + "datas");

Class Method:
[inject DataService ds]
datas = await ds.GetDatasAsync();

In the front-end code block, both methods can get back data, why use the httpclien method instead of the class method

I searched for a long time, did not find the answer, ask seniors for advice