Last 10 items from Firebasedatabase in Xamarin Forms

Question

With this i get all the items from a Firebasedatabase Decending by BalId to CollectionView or ListView.

public async Task<List<Fotos>> GetAllFotosLast()  
        {  
            try  
            {  
                await Task.Delay(2000);  
                return (await firebase  
                  .Child("Foto/")  
                  .OnceAsync<Fotos>()).Select(item => new Fotos  
                  {  
                      BalId = item.Object.BalId,  
                      RollNo = item.Object.RollNo,  
                      Foto = item.Object.Foto,  
                      Titel = item.Object.Titel,  
                      Fototekst = item.Object.Fototekst  
                  }).OrderByDescending (x => x.BalId).ToList();  
          }  
            finally  
            {  
            }     
        }  

But how do i get the last 10 items from this List Descending ?

Maybe with Limit 10 ????? but i does not recognise Limit in Xamarin Forms.

Is this possible to make ik work or do i have to try another way

Answer 1

Hello @Bas H ,

how do i get the last 10 items from this List Descending

You could descend the list according to the BalId, then take 10 objects, refer to the following code :

List<Fotos> fooList2 = fooList.OrderByDescending(x => x.BalId).Take(10).ToList();  

But it's not clear that if you want to get the last 10 items from the obtained list. If so, you can try the following code:

  List<Fotos> fooList3 = fooList.Skip(Math.Max(0, fooList.Count - 10)).ToList();// fooList is the list you get from database  

Best Regards,
Wenyan Zhang

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