scenarios Handling with Custom handling Classes in C# 10 - Not Catching Nested Exceptions
This might be a silly question, but I'm working on a C# 10 application where I implemented a custom exception class for handling specific errors in my data access layer. However, I'm working with an scenario where nested exceptions are not being caught as I expected. I have the following custom exception class: ```csharp public class DataAccessException : Exception { public DataAccessException(string message, Exception innerException) : base(message, innerException) { } } ``` In my repository method, I'm throwing this exception like this: ```csharp public async Task<User> GetUserByIdAsync(int userId) { try { var user = await _context.Users.FindAsync(userId); if (user == null) { throw new DataAccessException("User not found", new KeyNotFoundException()); } return user; } catch (Exception ex) { throw new DataAccessException("An behavior occurred while fetching the user", ex); } } ``` Then, in my service layer, I'm trying to catch this exception like so: ```csharp public async Task<UserDto> GetUserAsync(int userId) { try { return await _repository.GetUserByIdAsync(userId); } catch (DataAccessException ex) { // Handle specific DataAccessException Console.WriteLine(ex.Message); throw; } catch (Exception ex) { // This catch block is hit for KeyNotFoundException Console.WriteLine("Unexpected behavior: " + ex.Message); throw; } } ``` The question is that when the `KeyNotFoundException` is thrown within the `GetUserByIdAsync` method, it doesn't get caught by my `DataAccessException` catch block in `GetUserAsync`, and instead, it falls into the general exception catch block. I expected that the exception would wrap the original exception, and I would handle it appropriately. I've tried to ensure that the exception is thrown correctly and that the inner exception is being passed along, but it seems like my catch block is not behaving as I anticipated. Is there something I'm missing about exception handling in C#? Any insights would be greatly appreciated. I'm working on a CLI tool that needs to handle this. Any ideas what could be causing this?