[ApiController]
[Route("api/[controller]")]
public class MyController : ControllerBase
{
 private readonly DbContext _myDbContext;
 public MyController(DbContext myDbContext)
 {
 _myDbContext = myDbContext;
 }
 [HttpGet("products/chunked")]
 public async Task GetResponse([FromQuery] decimal maxPrice, [FromQuery] decimal minPrice)
 {
 Response.ContentType = "text/event-stream";
 var priceData = _myDbContext.Set<Product>()
 .Where(p => p.Price<= maxPrice && p.Price >= minPrice)
 .AsAsyncEnumerable();
 // priceData 会筛选出大量结果, 逐步返回结果
 await foreach (var data in priceData)
 {
 var json = JsonSerializer.Serialize(data);
 await Response.Body.WriteAsync(Encoding.UTF8.GetBytes($"data: {json}\n\n"));
 await Response.Body.FlushAsync();
 }
 }
 public record Product
 {
 public string Code { get; set; }
 public decimal Price { get; set; }
 public DateTimeOffset Timestamp { get; set; }
 }
}