C# 8 - Issues with Reflection and Lazy Loading in Entity Framework Core for Navigation Properties
I've tried everything I can think of but I'm working through a tutorial and I'm sure I'm missing something obvious here, but I'm encountering an issue when trying to use reflection to dynamically load navigation properties in an Entity Framework Core model..... I'm using EF Core 3.1 and C# 8. My goal is to lazily load related entities based on certain conditions, but I'm hitting a `System.InvalidOperationException` with the message: "The specified entity type is not part of the model for the current context." I have a `Student` entity that has a navigation property to `Courses`, and I'm trying to load `Courses` dynamically based on the student's ID. Here’s the setup of my entities: ```csharp public class Student { public int Id { get; set; } public string Name { get; set; } public virtual ICollection<Course> Courses { get; set; } } public class Course { public int Id { get; set; } public string Title { get; set; } } ``` And here’s the code I’ve written to fetch the student and their courses based on an ID: ```csharp public async Task<Student> GetStudentWithCoursesAsync(int studentId) { var student = await _context.Students.FindAsync(studentId); if (student != null) { var courses = await _context.Entry(student) .Collection(s => s.Courses) .LoadAsync(); } return student; } ``` The loading works fine if I directly access the `Courses` property, but when I try to load it dynamically using reflection like this: ```csharp var propertyInfo = typeof(Student).GetProperty("Courses"); if (propertyInfo != null) { await _context.Entry(student).Collection(propertyInfo.Name).LoadAsync(); } ``` I receive the aforementioned exception. I've verified that the `Courses` property is marked as virtual and that it's configured correctly in the DbContext. I've tried switching the reflection logic to use different approaches (e.g., using `nameof()`, etc.), but the issue persists. Does anyone have experience dealing with lazy loading and reflection in EF Core, and what might I be missing here? My development environment is Windows 11. Is this even possible? This is my first time working with C# 3.9. I appreciate any insights! What are your experiences with this?