Question

How do I get all of the “columns” using linq from this dictionary.

Dictionary<int, Dictionary<int, string>> _cells;

where I can access a row this way

var someRow = _cells[2];

and I am able to get a cell

string cell = _cells[2][2];

What I am trying to do is create table.

    A | B | C | ...
1 | * | * | * | ... 
2 | * | * | * | ... 
3 | * | * | * | ... 

Where I get the values of column A.

Answer 1

Maybe this is what you’re looking for?

Dictionary<int, Dictionary<int, string>> _cells;
int desiredColumn = 2;
var col = _cells.Values.Select(d => d[desiredColumn]);

That will go through the rows (inner dictionary) and simply pull out the values for the desired column.