Visual Studio 2022 - working with 'Object reference not set to an instance of an object' when running WinForms application with Entity Framework Core
I've been banging my head against this for hours. Quick question that's been bugging me - I am currently developing a WinForms application using Visual Studio 2022 and Entity Framework Core 6... I've set up my DbContext and entity classes correctly, but I'm getting a frustrating 'Object reference not set to an instance of an object' behavior when I try to retrieve data from the database. The behavior occurs at the line where I call `await _context.MyEntities.ToListAsync();` in my form's load event handler. Here’s a simplified version of my code: ```csharp public partial class MyForm : Form { private readonly MyDbContext _context; public MyForm(MyDbContext context) { InitializeComponent(); _context = context; } private async void MyForm_Load(object sender, EventArgs e) { try { var entities = await _context.MyEntities.ToListAsync(); // Code to bind entities to a UI control } catch (Exception ex) { MessageBox.Show(ex.Message); } } } ``` When I debug, the `_context` object is not null, and I’ve confirmed that the connection string in my `appsettings.json` is correct. I also tried adding some logging to see if the DbContext was being instantiated properly and it seems to be. However, the moment I call `ToListAsync()`, it throws the null reference exception. I’ve checked that my database contains the expected data and the corresponding entity class is correctly mapped. I’m using the latest version of Entity Framework Core. I’ve tried running the application after cleaning the solution and rebuilding it, but the scenario continues. Has anyone experienced a similar question? What could be going wrong here? Any ideas what could be causing this? I'm working on a web app that needs to handle this. I'd really appreciate any guidance on this. I'm working on a CLI tool that needs to handle this. Any ideas what could be causing this?