Complex LINQ Query with Groupings (need some help) - linq

Question

Hopefully someone can help out with the following scenario. I have a table in sql, and I am trying to return all the records which match the value. That logic can have AND based on the group. For example
Row ID Match Value Equal Group
1 >>> 1 >>> 1>>> a>>> a>>> 1
2 >>> 1 >>> a>>> b>>> 0>>> 1
3 >>> 2 >>> a>>> a>>> 1>>> 2
4 >>> 3 >>> b>>> c>>> 0>>> 3
5 >>> 4 >>> a>>> a>>> 1>>> 4
In this case a 1 in the equal column means "equal" a 0 means "not-equal"
This data set after linqed would return records 1, 2, 3 because in row 1, a = (from column Equal) a
AND a != (from column equal) b. Rows 1 and 2 are "AND" because they are in the same group. So on so forth.
Thanks!

Answer 1

Not sure if this is what you are getting at because your question is difficult to understand and it appears that your example data may contain a couple of typos. However, I modeled something similar for you below. Note I changed Row 1 because it looks like you had a typo, and I changed Row 5 so it would actually be an excluded case, otherwise you would have gotten everything.
public class Test
{
public int Row {get; set;}
public int ID {get; set;}
public string Match {get; set;}
public string Value {get; set;}
public int Equal {get; set;}
public int Group {get; set;}
}
void Main()
{
var items = new List<Test>();
items.Add(new Test() {Row = 1, ID = 1, Match = "a", Value = "a", Equal = 1, Group = 1});
items.Add(new Test() {Row = 2, ID = 1, Match = "a", Value = "b", Equal = 0, Group = 1});
items.Add(new Test() {Row = 3, ID = 2, Match = "a", Value = "a", Equal = 1, Group = 2});
items.Add(new Test() {Row = 4, ID = 3, Match = "b", Value = "c", Equal = 0, Group = 3});
items.Add(new Test() {Row = 5, ID = 4, Match = "a", Value = "b", Equal = 1, Group = 4});
var result = items.GroupBy(i => i.Group)
.Where(g => g.All(t =>
(t.Equal == 1 && t.Match == t.Value) ||
(t.Equal == 0 && t.Match != t.Value)))
.SelectMany(g => g.Select(i => i));
foreach (var i in result)
{
Console.WriteLine("Row: {0}, ID: {1}", i.Row, i.ID);
}
}
Result:
Row: 1, ID: 1
Row: 2, ID: 1
Row: 3, ID: 2
Row: 4, ID: 3