Using IAsyncEnumerable with Entity Framework Core for Pagination in C# - implementing State Management
I'm currently working on a web API using ASP.NET Core 6 and Entity Framework Core 6, and I'm trying to implement pagination using `IAsyncEnumerable<T>`. My goal is to retrieve a large dataset incrementally to improve performance and user experience. However, I'm running into issues with state management while iterating through the results. Here’s a simplified version of my repository method: ```csharp public async IAsyncEnumerable<MyEntity> GetPagedResultsAsync(int pageNumber, int pageSize) { var query = _context.MyEntities.AsQueryable(); await foreach (var item in query.Skip((pageNumber - 1) * pageSize).Take(pageSize).AsAsyncEnumerable()) { yield return item; } } ``` When I call this method from my controller like this: ```csharp [HttpGet] public async Task<IActionResult> GetEntities(int pageNumber, int pageSize) { var results = GetPagedResultsAsync(pageNumber, pageSize); return Ok(await results.ToListAsync()); } ``` I'm working with a `DbUpdateConcurrencyException` intermittently, especially when multiple users are accessing the paginated results simultaneously. It seems like the context is getting disposed before the enumeration completes, causing issues with tracking state. I’ve tried increasing the lifetime of my DbContext by scoping it to the request, but the question continues. I've also considered using `ToListAsync()` directly in the repository method, but I want to avoid loading all data into memory at once. Is there a best practice or pattern for handling state management with `IAsyncEnumerable` in conjunction with EF Core that will guide to avoid these concurrency issues? Any insights would be greatly appreciated.