Develop Reference

How can i find item in wpf listbox having grouped list bind to it?

My listbox is having a grouped list so basically I want to find listbox group item index with item value. Listbox is having item source bind to it and is having DisplayMemberPath and SelectedValuePath set from code behind.
What I have tried yet are as follow:-
int index = istboxName.Items.IndexOf(ListBindToItemSource.particularParameterValue);
Give index=-1 always.
Another solution I tried is:
int index = ListboxName.Items.Groups.IndexOf(ListBindToItemSource.particularParameterValue);
Same result index=-1 always.

You should never need to access the items that way, instead access the item in your bound source and manipulate that. If you want to change anything in the view, like e.g. a Background, bind it on your item and change it at the source.

Remove or add items in DataGridComboboxColumn on row add or delete

Here's my problem: I need to make a DataGrid with dynamic comboboxes using the WPF. If the value of a combobox is already used in the previous rows, the next ones, that will be added by the user, shouldn't contain the item already used.
In this image, the ITEM A shouldn't apear on the combobox of the second line.
I don't have ideia how to accomplish this, can anyone show me a light?
OBS: The DataGrid ItemsSource is binded to an ObservableCollection, and the DataGridComboBoxColumn ItemsSource is a List.
Thanks !!!

The ItemsSource of the combo doesn't have to be bound to an ObservableCollection, but it can help depending on exactly how you solve this.
When that cell goes in to edit mode the property the ItemsSource is bound to gets hit - so you can return a new list of items each time the getter is hit. Here is a very basic example to give you an idea:
public List<string> MyItemsSource
{
get
{
var myNewList = MyMasterList.ToList(); //create a (reference) copy of the master list (the items are not copied though, they remain the same in both lists)
if (PropertyA != null)
myNewList.Remove(PropertyA);
return myNewList;
}
}
So what you are creating and returning is a filtered version of your master list of all possible items. LINQ will be of great help to you here.
Alternatively you could keep just one static copy of the master list as an ObservableCollection, and simply remove items from that static copy as they get selected (and add them back in as they get unselected). Which option you choose will depend on how many times the list can be modified due to items being selected and how complicated it is to generate the list. I've used the dynamically generated list many times in the past, it's an option that works well in most cases.

The alternate style for ListBox in WPF not working as expected if the collection has some items which needs to be hidden

I am trying to bind my collection to a listbox. The collection contains some items which are to be hidden and are to be shown based on certain conditions.But when I do this the alternate styles are not applied properly.
For example:
Case 1 : where all items are visible, I get the output like this:
Item1(grey)
Item2(white)
Item3(grey)
Item4(white)
Item5(grey)
Item6(white)
Item7(grey)
Case2: where Item2 is hidden, I get the output as:
Item1(grey)
Item3(grey)
Item4(white)
Item5(grey)
Item6(white)
Item7(grey)
How do I resolve this without rebinding the collection?

Rather than hide the items (presumably in the ListBoxItem control template, or the ListBox ItemTemplate), you should use a CollectionViewSource to filter them out.
This is because the items are still technically there - you cannot see them but the listbox can.
See this link for details on filtering.
http://wpftutorial.net/DataViews.html
To filter a collection view you can define a callback method that
determines if the item should be part of the view or not. That method
should have the following signature: bool Filter(object item). Now set
the delegate of that method to the Filter property of the
CollectionView and you're done.
ICollectionView _customerView = CollectionViewSource.GetDefaultView(customers);
_customerView.Filter = CustomerFilter
private bool CustomerFilter(object item)
{
Customer customer = item as Customer;
return customer.Name.Contains( _filterString );
}

BindingSource And Composite Properties

I have a method that I call in a form that returns a List and then I throw that into a BindingSource and throw the BindingSource into a DataGridView. The Order class has a property called Items that contains a List. My Order and Item class both implement the INotifyPropertyChanged Interface.
What I'm trying to do is that when a row is clicked in the DataGridView it pulls up the list of items associated with the order from it's Items property into another grid. I want to ensure that those items are 2 way binded to the grid but I can't call it the way I'd like to...
itemsGrid.DataSource = orderBindingSource[orderGrid.CurrentRow.Index].Items;
I can't access the properties of the list from within the BindingSource (After the . operator, Items is not an available option)... Any recommendations? I've tried using a BindingList<Order> and BindingList<List<Order>> but was getting implicit conversion errors. Any suggestions?
*EDIT: Ok I've managed to get the BindingList to work. I didn't know I had to add the list like this
orderList = new BindingList<Order>(Method To Retrieve List<Order>)
Aside from this, the first grid displaying the orders works and updates perfectly. The sub grid which contains the Order's Items bound like
itemsGrid.Datasource = orderList[ordersGrid.CurrentRow.Index].Items;
It displays properly. I don't have editing enabled as I have a few textboxes that are setup and each textbox is bound to the Item from the orderList of the currently selected row of the ordersGrid. I can update the data in the textboxes for the selected item in the subgrid but the changes when I leave the textbox, the sub grid's row for that item property edited does not update as I leave the textbox. It will, however, update if I select another item in the grid. How can I get it to update as I leave the textbox instead of having to click on another row in the grid?

Set WPF Datagrid column as a Combobox itemsource

I have a Combobox, in which I would like its items to be the column data that is located on a DataGrid. Is there anyway to set the Combobox itemsource to be a specific column of a DataGrid?
Right now I'm iterating each row of the DataGrid, getting the field's data and adding them to the Combobox, but that means that I would have to clear all the items and reiterate everytime the DataGrid is modified.

You can set ItemsSource and DisplayMemberPath properties:
comboBox1.ItemsSource = dataGrid1.ItemsSource;
comboBox1.DisplayMemberPath = "ColumnName";

I Think you'are taking the wrong approach. Your data grid must be bound to a collection of object. I guess you could just build another collection by extracting the desired fields (for example with linQ) and expose this new collection to your view such that you can bind your combobox.
I you want to keep this second collection updated, make your first main collection an ObservableCollection such taht your can subscribe to CollectionChanged Event. In the event handler, just manage the add and remove in your combobox source collection.