Question

I want to make a C# DataGridView’s DataSource be a HashTable where there are two columns:

• The first one would be the key;
• The second the value.

Is this possible?

EDIT: Please see my comment about setting/getting the value from/to a hashtable.
Thanks!

Answer 1

The problem here is that you cannot bind directly to a HashTable. You’ll need something that implements: IList, IListSource, IBindingList, IBindingListView. HashTable does not implement any of those interfaces.

Try using LINQ to get your HashTable into a List:

Hashtable ht = new Hashtable();    
ht.Add(1,"foo");
ht.Add(2,"bar");    
dataGridView1.DataSource = ht.Cast<DictionaryEntry>()
                             .Select(x => new { Col1 = x.Key.ToString(), 
                                                Col2 = x.Value.ToString() })
                             .ToList();

Note that the anonymous class has 2 named properties (I used Col1 and Col2 for brevity. Your grid must know about them exactly: