问题
in Product SKUs, we can get Cartesian Product in the way of LINQ:
string[] arr1 = new[] {"red", "blue", "orange"};
string[] arr2 = new[] {"5 inche", "8 inch"};
var result = from a in arr1
from b in arr2
select a + " " + b;
foreach (var item in result){
Console.WriteLine(item);
}
We know the exact number of arrays.
My question is: If the number of arrays is dynamic, how do we get Cartesian Product?
Thanks.
回答1:
I'd put them in a list
of string arrays. Then I'd use ForEach
:
IEnumerable<string> result = list.First();
list.RemoveAt(0);
list.ForEach(delegate(IEnumerable<string> value)
{
result = (from r in result
from v in value
select r + " " + v).ToList();
});
You can also see this link : Cartesian Product for Group members
回答2:
I liked Raeen's answer and it made me think of a simple linq way to solve this problem. This is a very similar method, but doesn't involve any state external to the computation.
var list = new List<IEnumerable<string>>()
{
new[] {"red", "blue", "orange"},
new[] {"5 inche", "8 inch"},
new[] {"x", "y"},
};
var result =
list
.Aggregate((rs, vs) =>
from r in rs
from v in vs
select r + " " + v)
.ToList();
来源:https://stackoverflow.com/questions/26965507/n-ary-multiple-list-cartesian-product