CODEWITHSUNDEEP
wpflinq
Eda
Eda

Reputation: 21

The best overloaded method match for 'System.Collections.ObjectModel.ObservableCollection has some invalid arguments

Can some one please tell me Why is this not possible? I am new to WPF and Linq I am trying to select a value from my first combobox and display the related values in my second combobox.

private void initializeTransactionTypes()
{
    var getAppCode = applicationVModel.GetAllApplications().FirstOrDefault(apps =>   apps.AppCode == selectedApplication);

    var transTypeList = (from transName in transTypeVModel.GetAllTransactionTypes()
                         where transName.Id == getAppCode.Id
                         select transName.Name).ToList();


    //cast list of string to observ.
    ObservableCollection<TransactionTypeViewModel> transTypeObsList =
        new ObservableCollection<TransactionTypeViewModel>(transTypeList);

    TransactionTypes = transTypeObsList;

    NotifyPropertyChanged("TransactionTypes");
    // }

    //}
}

// Bind trans type combobox to this
public ObservableCollection<TransactionTypeViewModel> TransactionTypes
{
    set
    {
        initializeTransactionTypes();
        NotifyPropertyChanged("TransactionTypes");
    }
    get
    {
        return _transactionType;
    }
}

Upvotes: 0

Views: 1125

Answers (1)

Lee
Lee

Reputation: 144196

It looks like transTypeList is a List<string> (assuming transName.Name is a string) and you are trying to use it to initialise an ObservableCollection<TransactionTypeViewModel>.

The constructor for ObservableCollection<T> requires a List<T> so you need to provide a List<TransactionTypeViewModel> instead.

It looks like you just need to change your linq query to:

var transTypeList = (from transName in transTypeVModel.GetAllTransactionTypes()
                     where transName.Id == getAppCode.Id
                     select transName).ToList();

or alternatively:

var transTypeList = transTypeVModel.GetAllTransactionTypes()
                                   .Where(t => t.Id == getAppCode.Id)
                                   .ToList();

Upvotes: 0

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