Trying to create overlapping Window

[dotnetdan]

Hello,

I'm trying to create overlapping windows. Given a sequence 1..10, I want to create (1,2), (2,3), ..., (9,10)

var source = Observable.Range(1, 10);

source
    .Window(2, 1)
    .Subscribe(w =>
    {
        Console.WriteLine("new window:");
        w.Subscribe(x =>
        {
            Console.WriteLine(x);
        });
    });

outputs

new window:
1
new window:
2
2
new window:
3
3
new window:
4
4
new window:
5
5
new window:
6
6
new window:
7
7
new window:
8
8
new window:
9
9
new window:
10
10
new window:

This output doesn't make sense to me. Am I doing something wrong?

For comparison, a non-overlapping window works the way I expect:

var source = Observable.Range(1, 10);

source
    .Window(2, 2)
    .Subscribe(w =>
    {
        Console.WriteLine("new window:");
        w.Subscribe(x =>
        {
            Console.WriteLine(x);
        });
    });

new window:
1
2
new window:
3
4
new window:
5
6
new window:
7
8
new window:
9
10
new window:

[akarnokd]

The misunderstanding comes from WriteLine where it is not obvious which source value ended up in which window in your code.

var source = Observable.Range(1, 10);
var counter = new int[1];

source
    .Window(2, 1)
    .Subscribe(w =>
    {
        Console.WriteLine("new window:");
        var id = ++counter[i];
        w.Subscribe(x =>
        {
            Console.Write(id);
            Console.Write(": ");
            Console.WriteLine(x);
        });
    });