How to convert ToList to ObservableCollection?

Question

Good Day Everyone. I'm creating a Xamarin.Forms Portable Application I just want to ask how am I going to convert this expression from List to ObservableCollection. Take a look at the 'ToList();' code. I don't know how to change it in order for it to read an observable collection.

 CustomerList = _searchedCustomerList.Where(r => r.CUSTOMER_NAME.ToLower().Contains(_keyword.ToLower())).ToList();

I'm having problem how to do this because I prefer to use an ObservableCollection rather than the List. So I declare the CustomerList as ObservableCollection.

    public ObservableCollection<Customer> CustomerList
    {
        get
        {
            return _customerList;
        }
        set
        {
            _customerList = value;
            OnPropertyChanged();
        }
    }

Is there anyway to do this? Thanks a lot.

Just do a basic google search and you should get the answer. — Rohit Vipin Mathews, Aug 10 '16 at 08:39
@Rohit Yeah. I just want to have an exact answer that's why I asked it here. Thanks anyway. — Jaycee Evangelista, Aug 10 '16 at 08:42

Raskayu · Answer 1 · 2016-08-10T08:45:47.870

8

ObservableCollection <T> have constructor which takes IEnumerable <T>

Example:

ObservableCollection<Customer> myCollection = new ObservableCollection<Customer>(myList);

edited Aug 10 '16 at 08:45

answered Aug 10 '16 at 08:19

Raskayu

735
7
20

i'm creating a searchbar, so what should be my actual code above be like? – Jaycee Evangelista Aug 10 '16 at 08:27
Initializing an Observable collection kills its purpose. Use `Remove()` and `Add()` – Rohit Vipin Mathews Aug 10 '16 at 08:44
In your coude can look like `CustomerList = new ObservableCollection( _searchedCustomerList.Where(r => r.CUSTOMER_NAME.ToLower().Contains(_keyword.ToLower())).ToList() );` – Raskayu Aug 10 '16 at 08:46
1

For first time you can create as per @Raskayu, but on subsequent calls intead of calling the constructor use Remove() and Add() methods of Observable collection. Try reading through - http://stackoverflow.com/questions/4279185/what-is-the-use-of-observablecollection-in-net – Rohit Vipin Mathews Aug 10 '16 at 10:54
@Rohit Whenever I put your codes, my SearchBar doesn't seem to work anymore. – Jaycee Evangelista Aug 10 '16 at 11:27

score 3 · Answer 2 · answered Aug 10 '16 at 08:21

3

You can use the constructor:

public ObservableCollection( 
    List<T> list 
)

https://msdn.microsoft.com/en-us/en-en/library/ms653202(v=vs.110).aspx

Just create a new ObservableCollection and pass the list as an argument to the constructor.

answered Aug 10 '16 at 08:21

Oscar

13,594
8
47
75

How to convert ToList to ObservableCollection?

2 Answers2