Question

I have A list

key ParentKey
1   Null
2   1
3   Null
4   Null
5   1
6   4
7   6
8   3

I want it sorted in

key ParentKey
1   Null
2   1
5   1
3   Null
8   3
4   Null
6   4
7   6

via linq how can this be done?
Any help is most wellcome

Answer 1

Assuming that the result should be:

key ParentKey
1   Null
2   1
5   1
3   Null
8   3
4   Null
6   4
7   6

I can say that you can’t do anything if there isn’t a logic that make the null values in that position into the list.

So using Linq you can order the list using the OrderBy() function:

list = list.OrderBy(x => x.ParentKey).ToList();

But using this function the result is the following:

key ParentKey
1   Null
3   Null
4   Null
2   1
5   1
8   3
6   4
7   6