Question

I have a field object and I create a list of fields:

class Field {  string objectName; string objectType; string fieldName; string fieldValue;  //constructor...  }    List<Field> fieldList = new List<Field>(); 

Suppose I wanted to query this list to return a collection of distinct object names (to then be inserted into a checkedlistbox. How would I go about doing that?

I imagine some LINQ magic can manage this?

Answer 1

The expression should return a List of distinct object names from the list as defined. I converted it to a list since the docs for the CheckedListBox DataSource property indicated that it needs to implement IList or IListSource, not merely IEnumerable.

((ListControl)cbListBox).DataSource = fieldList.Select( f => f.objectName )                                                .Distinct()                                                .ToList() ); 

If accessing the checkedListBox as a ListControl doesn’t give access to the DataSource (sometimes the docs lie), you could try:

cbListBox.Items.AddRange( fieldList.Select( f => f.objectName )                                    .Distinct()                                    .ToArray() );