CODEWITHSUNDEEP
c#wpf
mrsargent
mrsargent

Reputation: 2442

Error when changing to ObservableCollection

I am new to WPF and have a beginner question. Whenever I added data to a collection my UI was only getting updated after I restarted the program. I was originally using ICollection but realized I need to use OvservableCollection to update the collection. When I swtiched the Customers property from ICollection to ObservableCollection I get an error on my UpDate method saying I can't implicitly convert. Is possible to cast an ObservableCollection. How else could I fix this issue? Thanks in advance.

ViewModel.cs

 public ViewModel()
    {
        Customers = new ObservableCollection<Customer>();
        UpDate();
    }

    public void UpDate()
    {
        Customers.Clear();
        foreach (var customer in context.Customers.OrderBy(c => c.Name))
        {
            Customers.Add(customer);
        }
    }

    #region Add new customer,project,program,rev methods

    public void AddCustomer(string customerName)
    {
        using (context = new RevisionModelContainer())
        {
            var customer = context.Customers;
            customer.Add(new Customer { Name = customerName });
            context.SaveChanges();
            UpDate();
        }          
    }


 public ObservableCollection<Customer> Customers { get; set; }
    public ObservableCollection<Project> Projects { get; set; }
    public ObservableCollection<Program> Programs { get; set; }
    public ObservableCollection<Revision> Revisions { get; set; }
    public DateTime Dates { get; set; }
    public string Notes { get; set; }

Customer.cs

  public partial class Customer
{
    public Customer()
    {
        this.Projects = new ObservableCollection<Project>();
    }

    public int Id { get; set; }
    public string Name { get; set; }

    public virtual ObservableCollection<Project> Projects { get; set; }
}

Upvotes: 0

Views: 102

Answers (1)

dkozl
dkozl

Reputation: 33364

create instance of Customers in ViewModel constructor 

public ViewModel()
{
    Customers = new ObservableCollection<Customer>();
    UpDate();
}

and populate the list when UpDate is called

public void UpDate()
{
    Customers.Clear();
    foreach(var customer in context.Customers.OrderBy(c => c.Name)) Customers.Add(customer);
}

Upvotes: 2

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