I have three (it's possible to have more than 3-4 generic list, but in this example let 3) generic lists.
List<string> list1
List<string> list2
List<string> list3
all lists have same number of elements (same counts).
I used that for combining two lists with ZIP :
var result = list1.Zip(list2, (a, b) => new {
test1 = f,
test2 = b
}
I used that for foreach
statement, to avoid foreach
each List, like
foreach(var item in result){
Console.WriteLine(item.test1 + " " + item.test2);
}
How to use simmilary with Zip for three lists ?
Thanks
EDIT:
I want like:
List<string> list1 = new List<string>{"test", "otherTest"};
List<string> list2 = new List<string>{"item", "otherItem"};
List<string> list3 = new List<string>{"value", "otherValue"};
after ZIP (I don't know method), I want to result (in VS2010 debug mode)
[0] { a = {"test"},
b = {"item"},
c = {"value"}
}
[1] { a = {"otherTest"},
b = {"otherItem"},
c = {"otherValue"}
}
How to do that ?
The most obvious way for me would be to use Zip
twice.
For example,
var results = l1.Zip(l2, (x, y) => x + y).Zip(l3, (x, y) => x + y);
would combine (add) the elements of three List<int>
objects.
Update:
You could define a new extension method that acts like a Zip
with three IEnumerable
s, like so:
public static class MyFunkyExtensions
{
public static IEnumerable<TResult> ZipThree<T1, T2, T3, TResult>(
this IEnumerable<T1> source,
IEnumerable<T2> second,
IEnumerable<T3> third,
Func<T1, T2, T3, TResult> func)
{
using (var e1 = source.GetEnumerator())
using (var e2 = second.GetEnumerator())
using (var e3 = third.GetEnumerator())
{
while (e1.MoveNext() && e2.MoveNext() && e3.MoveNext())
yield return func(e1.Current, e2.Current, e3.Current);
}
}
}
The usage (in the same context as above) now becomes:
var results = l1.ZipThree(l2, l3, (x, y, z) => x + y + z);
Similarly, you three lists can now be combined with:
var results = list1.ZipThree(list2, list3, (a, b, c) => new { a, b, c });