Question

I have the following class:

• Id int
• Active bool
• DateTime datetime
• Approved bool

I have the list of that class similar to this:

• Id 1 Active true Approved true
• Id 2 Active true Approved true
• Id 3 Active true Approved true
• Id 4 Active true Approved false
• Id 5 Active true Approved false
• Id 6 Active true Approved false
• Id 7 Active true Approved true
• Id 8 Active true Approved true
• Id 9 Active true Approved false

I want to get items from list group by Approved but i want grouped objects to be in this order:

• True all objects till first false.
• False all objects till next true.
• True all objects till next false.
• False all objects till next true.

Thanks in advance

Answer 1

Looks like you need to use TakeWhile method

http://msdn.microsoft.com/ru-ru/library/bb534804(v=vs.95).aspx

I’m not very good in LINQ but this code should work. This principle also could be extended not only for booleans, but for any type which supports IEqualityComparer

var list = new List<Test>();
list.Add(new Test(1, true, true));
list.Add(new Test(2, true, true));
list.Add(new Test(3, true, true));
list.Add(new Test(4, true, false));
list.Add(new Test(5, true, false));
list.Add(new Test(6, true, false));
list.Add(new Test(7, true, true));
list.Add(new Test(8, true, true));
list.Add(new Test(9, true, false));

var listTemp = list;
var result = new List<Tuple<bool, List<Test>>>();

while (listTemp.Count > 0)
{
    var approved = listTemp[0].Approved;
    var tuple = new Tuple<bool, List<Test>>(approved, listTemp.TakeWhile(x => approved == x.Approved).ToList());
    result.Add(tuple);
    listTemp = listTemp.SkipWhile(x => approved == x.Approved).ToList();
}