Mysterious Behavior with Lazy Initialization in C# Using Entity Framework Core 6.0
Quick question that's been bugging me - I'm encountering an issue with lazy loading in my application using Entity Framework Core 6.0... I have a `Blog` class that contains a collection of `Posts`, and I expect that accessing `Posts` should trigger lazy loading. However, I'm getting an unexpected `NullReferenceException` when I try to access the `Posts` property after fetching the `Blog` entity without explicitly including the related `Posts` in the query. Here's a simplified version of my `Blog` and `Post` classes: ```csharp public class Blog { public int BlogId { get; set; } public string Title { get; set; } public virtual ICollection<Post> Posts { get; set; } } public class Post { public int PostId { get; set; } public string Content { get; set; } public int BlogId { get; set; } public virtual Blog Blog { get; set; } } ``` In my DbContext, I have configured lazy loading as follows: ```csharp public class MyDbContext : DbContext { public DbSet<Blog> Blogs { get; set; } public DbSet<Post> Posts { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Blog>().ToTable("Blogs"); modelBuilder.Entity<Post>().ToTable("Posts"); } } ``` When I try to access the `Posts` collection like this: ```csharp using (var context = new MyDbContext()) { var blog = context.Blogs.FirstOrDefault(b => b.BlogId == 1); var posts = blog.Posts; // This line throws NullReferenceException } ``` I have checked that the `BlogId` is valid and that there are corresponding posts in the database. I've also ensured that lazy loading proxies are enabled in my `DbContext`. The exception occurs even when I try to check if `Posts` is null before accessing it, which makes me think something is going wrong with the lazy loading itself. I’ve tried including the `Posts` in the query using `.Include(b => b.Posts)` and it works perfectly, but I want to understand why lazy loading is not functioning as expected. What could I be missing in my configuration or code setup that prevents lazy loading from working properly? My development environment is Windows. Any ideas what could be causing this?