Sorting a List of Custom Objects in C# with Nullable DateTime Properties - Unexpected Comparisons
Can someone help me understand I tried several approaches but none seem to work..... I'm trying to sort a list of custom objects in C# where one of the properties is a nullable `DateTime`. The objects represent events with a `DateTime?` property called `EventDate`. When I sort the list, I expect that events with a `null` `EventDate` should come last, but instead, they are interspersed throughout the sorted list, which is not the behavior I want. Here’s the code I’m using: ```csharp public class Event { public string Name { get; set; } public DateTime? EventDate { get; set; } } List<Event> events = new List<Event> { new Event { Name = "Event 1", EventDate = new DateTime(2022, 5, 1) }, new Event { Name = "Event 2", EventDate = null }, new Event { Name = "Event 3", EventDate = new DateTime(2022, 4, 1) }, new Event { Name = "Event 4", EventDate = new DateTime(2022, 6, 1) }, new Event { Name = "Event 5", EventDate = null } }; events.Sort((x, y) => { if (x.EventDate == null && y.EventDate == null) return 0; if (x.EventDate == null) return 1; if (y.EventDate == null) return -1; return x.EventDate.Value.CompareTo(y.EventDate.Value); }); ``` After running this code, the output still shows events with `null` dates mixed in with those that have dates. The sorted output looks something like this: `Event 3, Event 1, Event 2, Event 4, Event 5`, which is incorrect since `Event 2` and `Event 5` should be at the end. I’ve tried changing the comparison logic, but it doesn't seem to resolve the issue. Am I missing something in the sort logic, or is there a best practice to handle sorting with nullable types that I should be aware of? Any insights would be greatly appreciated! This is part of a larger web app I'm building. Am I missing something obvious? Thanks, I really appreciate it!