Converting Object to List<String>

Question

I am getting the List of selected Items from WPF Attached Behavioral for ListBox as below:

  private void ListBoxSelectionChanged(object param)
    {
        var selectedItems = param;
        SelectedMItems = selectedItems.ToString().Split(',').ToList<string>();
        //Console.WriteLine(selectedItems.ToString());

    }

Though it works , is there any other better way.

What's the actual type? Could it be an ObservableCollection<string>? — Grant Thomas
– Grant Thomas, Commented Mar 7, 2013 at 13:48
This will work fine as long as you're confident the object correctly implements .ToString(). You haven't given any details about the object so I won't project any such confidence for you. — jonvuri
– jonvuri, Commented Mar 7, 2013 at 13:48
@GrantThomas,@jrajav, object is Collection of selected Items from ListBox , the list box has multiple selection option — Simsons
– Simsons, Commented Mar 7, 2013 at 13:49

Kendall Frey · Accepted Answer · 2013-03-07 14:08:09Z

3

The SelectedItems property is an IList, so I'm assuming your object is as well.

In this case, it would be simplest to do one of these two:

// If the list already contains strings
SelectedMItems = ((IList)selectedItems).Cast<string>().ToList();

// If the list contains other objects
SelectedMItems = ((IList)selectedItems).Cast<object>().Select(o => o.ToString()).ToList();

edited Mar 7, 2013 at 14:08

answered Mar 7, 2013 at 13:59

Kendall Frey

44.6k21 gold badges113 silver badges151 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

nicodemus13 Over a year ago

Why the Cast<object>()? Everything's an object and must implement ToString() surely?

Simsons Over a year ago

Object Does contain a method for Cast

Kendall Frey Over a year ago

The Cast doesn't do anything other than convert the IEnumerable to an IEnumerable<object>, because Select is not available for IEnumerable.

Kendall Frey Over a year ago

@Simsons I added a cast. Try again.

Grant Thomas · Accepted Answer · 2013-03-07 13:50:32Z

1

Something like this might work, in order to be 'safer':

var items = param as ObservableCollection<string>;

Or even just an enumerable:

var items = param as IEnumerable<string>;

Then you have a collection of items proper.

answered Mar 7, 2013 at 13:50

Grant Thomas

45.1k10 gold badges88 silver badges129 bronze badges

4 Comments

Daniel A. White Over a year ago

i would even go as far as doing just IEnumerable.

Grant Thomas Over a year ago

@Simsons Did you examine the thing in the debugger and see what it is?

Simsons Over a year ago

Type is object {System.Windows.Controls.SelectedItemCollection}

Grant Thomas Over a year ago

So, do ... as SelectedItemCollection, and have a nice strongly typed thing. (:

Collectives™ on Stack Overflow

Converting Object to List<String>

2 Answers 2

4 Comments

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

4 Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related