Single list need cross join in c# records

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C#

I have 1 list of records that list have some sub list of records i need merge that two list record in generic list . Any one help me .... EXAMPLE LIST 1 A1,A2,A3,A4 LIST 2 B1,B2,B3,B4 Need output like that A1 B1 A1 B2 A1 B3 A1 B4 A2 b1 A2 B2 . . . like that i need

What I have tried:

C#

foreach (GroupRouting objGroupRouting in objlstGroupRouting)
                    {
                        foreach (OutwardRouting objOutwardRouting in objGroupRouting.Outward)
                        { 
                            objlstOutwardRouting.Add(objOutwardRouting);
                        }
                    }
                    objlstOutwardRouting = objlstOutwardRouting.Union(objlstOutwardRouting).ToList();

Posted 29-Feb-16 0:50am

satheeshkumar chinnadurai

Updated 3-Mar-16 10:37am

Andy Lanng

v3

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Andy Lanng 29-Feb-16 8:42am

whats the problem

satheeshkumar chinnadurai 29-Feb-16 9:06am

I AM NOT GETTING

Need output like that
A1 B1
A1 B2
A1 B3
A1 B4
A2 b1
A2 B2

CAN YOU PLEASE HELP ME...

BulletVictim 29-Feb-16 9:34am

having to lists with only one input is going to be difficult to join as there is no common field in the two lists. So at least one list will need to have more than one value contained per object.

ZurdoDev 29-Feb-16 9:40am

A nested loop is one way to go so why doesn't your code work? Don't union them.

Loop through list 1, which will go A1, A2, etc. And then in inner loop, go through list 2, B1, B2, etc and add to the looping var from the first loop.

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Maciej Los · Answer 1 · 2016-03-03T10:37:00

Seems you want to perform cross join operation.
Check this:

C#

List<string> l1 = new List<string>(){"A1", "A2", "A3", "A4"};
List<string> l2 = new List<string>(){"B1", "B2", "B3", "B4"};

//standard query
//var allitems = from a in l1 
//				from b in l2
//				select new {
//					A = a,
//					B = b
//				};

//using lambda expressions
var lambdaitems = l1.SelectMany(x=> l2, (x, y) => new {A = x, B = y});

Both queries return the same result:

A B
A1 B1 
A1 B2 
A1 B3 
A1 B4 
A2 B1 
A2 B2 
A2 B3 
A2 B4 
A3 B1 
A3 B2 
A3 B3 
A3 B4 
A4 B1 
A4 B2 
A4 B3 
A4 B4

Try!

For further information, please see:
101 LINQ Samples in C#[^]
LINQ 101 Samples - Lambda Style[^]