Unexpected Result from C# LINQ Query Inside Function with Multiple Lists - Need guide Understanding Behavior
I'm integrating two systems and I recently switched to I can't seem to get This might be a silly question, but I'm working with an scenario with a C# function that is intended to filter results from multiple lists using LINQ. The function takes two lists of objects, and I want to return a combined list based on specific criteria. However, I'm experiencing unexpected results where the combined output is not what I anticipate. The function is as follows: ```csharp public class Item { public string Name { get; set; } public int Value { get; set; } } public List<Item> CombineAndFilter(List<Item> list1, List<Item> list2, int threshold) { var filteredItems = list1.Concat(list2) .Where(item => item.Value > threshold) .ToList(); return filteredItems; } ``` I call the function like this: ```csharp var listA = new List<Item>{ new Item { Name = "Item1", Value = 10 }, new Item { Name = "Item2", Value = 5 } }; var listB = new List<Item>{ new Item { Name = "Item3", Value = 20 }, new Item { Name = "Item4", Value = 15 } }; var result = CombineAndFilter(listA, listB, 8); ``` I expect the `result` to contain "Item1", "Item3", and "Item4" since they all have values greater than 8. Instead, the result only includes "Item3" and "Item4". After debugging, I confirmed that both lists are being passed correctly, and their values are what I expect. I also tried simplifying the LINQ query, separating the concatenation and filtering into two steps, but that did not change the outcome. My LINQ version is 6.0.0. Am I missing something in how the `Concat` method behaves with the filtering? Is there an edge case in LINQ that I might not be aware of? Any insights would be greatly appreciated! My development environment is Ubuntu. I'd really appreciate any guidance on this. I'd really appreciate any guidance on this. My team is using C# for this CLI tool.