Question

Please Help me in the following…
I have two list objects as follows:

list1:
ID  col1
--------
1   A
1   B
1   C

list2:
ID  col2
--------
1   D
1   E 
1   F

Now I want:
ID  col1  col2
---------------
1    A     D
1    B     E
1    C     F

So basically column1 then column 2 from list1 then column 3 from list 2. Column1 is common.
Please note that the number of rows may not be always same.. in that case it will be null.

I really really need this solution in Linq. Thanks.

Answer 1

List<Class> list1 = new List<Class>();
List<Class> list2 = new List<Class>();

// Add classes to lists...

list1.AddRange(list2);

// Order merged list...

list1.OrderByDescending(o => o.col1).ThenBy(o => o.col2);

Trying to understand…

Dictionary<Int32, Class[]> dictionary = new Dictionary<Int32, Class[]>();

list2.Reverse();

for (Int32 i = 0; i < list1.Count; ++i)
    dictionary[i] = new Class[2] { list1[i], list2[i] };