Bind subset of collection

Question

I have an ObservableCollection<Person> object. The Person objects have Name and Type properties, where Type is either student or teacher. Is there any way to bind a ComboBox to a subset of the ObservableCollection<Person> object, where the Type property is only teacher?

Rohit Vats · Answer 1 · 2016-05-19T16:40:09.470

8

ICollectionView is your answer here -

public ICollectionView Teachers
{
   get
   {
      // Persons is your ObservableCollection<Person>.
      var teachers = CollectionViewSource.GetDefaultView(Persons);
      teachers.Filter = p => (p as Person).Type == "Teacher";
      return teachers;
   }
}

You can bind your comboBox ItemSource with this property. When any item is added or removed from your source collection, this collection will be filtered automatically..

edited May 19 '16 at 16:40

answered Mar 08 '12 at 17:06

Rohit Vats

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I'm a little late to the party but little typo : `var teachers` should be `var source` – Mickael V. May 19 '16 at 15:54
@MickaelV. - Thanks.. Updated..!! – Rohit Vats May 19 '16 at 16:41

score 2 · Answer 2 · edited May 23 '17 at 12:08

2

This will help you

WPF Binding to a Combo using only a subset of a Collection's items

Here are mentioned concepts like CollectionViewSource, Filters ecc...

Have a look also at

Data bind to a portion of a collection

edited May 23 '17 at 12:08

Community

1
1

answered Mar 08 '12 at 16:51

Klaus78

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Thanks, there are some good information and links from those two questions. – dotancohen Mar 08 '12 at 19:22

ahmet · Accepted Answer · 2012-03-08T17:26:45.140

1

You can do this programatically as follows:

MyComboBox.ItemsSource = a.Where((obj, r) => { return (obj.Type == "student"); }).ToList();

edited Mar 08 '12 at 17:26

answered Mar 08 '12 at 16:52

ahmet

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Thanks, this is the cleanest and most obvious way to filter from what I can tell. – dotancohen Mar 08 '12 at 19:24

Bind subset of collection

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