Question

What is the easiest way to convert List<DayValue> to array, where index is day of month:

class DayValue 
{
    public DateTime Day { get; set; }
    public object Value { get; set; }
}

I need to do this inline, because this will be used in linq. I know I can just iterate throug items and set array values, but this needs to be done line that

 list.FunctionThatConvertsItIntoArray()

Example:

Input list:

{ 2012-11-01, "Value1" }
{ 2012-11-03, "Value2" }
{ 2012-11-05, "Value3" }

Output array:

1 => "Value1"
2 => null
3 => "Value2"
4 => null
5 => "Value3"
6 => null
7 => null
8 => null    
9 => null 
10 => null
11 => null
12 => null
13 => null
14 => null
15 => null
16 => null
17 => null
18 => null
19 => null
20 => null
21 => null
22 => null
23 => null
24 => null
25 => null
26 => null
27 => null
28 => null
29 => null
30 => null

Answer 1

var days = Enumerable.Range(1, 31)
                     .Select(i => list.Find(x => x.Day.Day == i))
                     .Select(d => d != null ? d.Value : null)
                     .ToArray();