LINQ query into ObservableCollection?

Question

Cast LINQ result to ObservableCollection

Jon Skeet give a great answer in the question ,but I still cannot make my own.

Still new to classes, so I am still i

Answer 1

Basically, you need to pass IEnumerable<Staff_Time_TBL> result of the actual query to the database to initialize the ObservableCollection<Staff_Time_TBL> :

var linqResults = sql.Staff_Time_TBLs
                     .Where(staff => staff.Staff_No == SelectedEmployee.Key &&
                                     staff.Date_Data == filterFrom &&
                                     staff.Date_Data == filterTo);

var observable = new ObservableCollection<Staff_Time_TBL>(linqResults);

Answer 2

You need ObservableComputations. Using this library you can code like this:

var linqResults = sql.Staff_Time_TBLs
                     .Filtering(staff =>
                        staff.Date_Data > fromDate &&
                        staff.Date_Data < toDate &&
                        staff.Staff_No == employeeNumber);

In code above I assumed sql.Staff_Time_TBLs is ObservableCollection. linqResults is ObservableCollection and reflects all the changes in the sql.Staff_Time_TBLs collection and properties mentioned in the code. Ensure that all properties mentioned in the code above notify of changes through the INotifyPropertyChanged interface.