How to Get value from ienumerable list?

anand P

Hi,

I tried

var maxId = HouseList.Max(h => h.HouseId);

but i get error as

Sequence contains no elements

But I had loaded element into list as

 public void LoadHouse()
        {
            _stx = new CPMDomainContext();
            LoadOperation<House> lo = _stx.Load(_stx.GetHousesQuery());
            HouseList = lo.Entities;
        }

I use HouseList as ItemSource for a combobox..It binds data..But while i check HouseList.count always zero.How can i get elements from HouseList.Help me..

6 Replies

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anand P14y ago
Hi vulpes,

My combobox is in view.I bind it from view model by having a list called HouseList.

I can get value from combobox itself.But i don't know how to pass this value to my view model.
so i try to take value from HouseList in viewmodel itself.
Vulpes14y ago
So, just to be clear, are you saying that even though HouseList appears to have no elements, you can nevertheless bind to it and the combobox does display some elements?

If so, then perhaps your best option is to get the elements from the combobox itself.
anand P14y ago
Hi ,

i tried it..Now also HouseList.count is zero.

and the following throw exception.

var maxId = HouseList.Max(h => h.HouseId);
Sukesh Marla14y ago
Do like this
List HouseList =lo.Entities.ToList();
Now Bind HouseList to DropDown
and now it will work
var maxId = HouseList.Max(h => h.HouseId);

Check this is correct answer if it helped
anand P14y ago
I tried it..Message box also show 0.
Vulpes14y ago
What do you get if you try to count the elements immediately after loading?

public void LoadHouse()
{
_stx = new CPMDomainContext();
LoadOperation lo = _stx.Load(_stx.GetHousesQuery());
HouseList = lo.Entities;
MessageBox.Show(HouseList.Count().ToString());
}