C# List

Question

I would like to initialize a list with a given number of items, all with value DBNull.Value, is this possible via AddRange?

This code initializes as nulls and not DBNull.Value

_cellList = new List<object>(new DBNull[_columns.Count]);

Whereas this does the job correctly, but with a for loop:

_cellList = new List<object>();
for(int i = 0; i<_columns.Count; i++)
{
    _cellList.Add(DBNull.Value);
}

thanks

score 3 · Accepted Answer · answered Feb 13 '17 at 18:24

3

You can use Enumerable.Repeat in combination with ToList, like this:

_cellList = Enumerable
    .Repeat(DBNull.Value, _columns.Count)
    .Cast<object>()
    .ToList();

Note the use of Cast<object>(), which is necessary to construct List<object> instead of List<DBNull>.

answered Feb 13 '17 at 18:24

1 Answers1