Я создал пример проекта Web API в ASP.Net-Core, который использует базу данных InMemory, и он показывает странное поведение, при котором использование памяти не изменялось (уменьшалось) при удалении ее из базы данных.
Я подтвердил при просмотре ".«Net Core Host» в TaskManager (taskmgr.exe), и я не могу найти причину.
Я протестировал swagger, и мой пример кода приведен ниже.Скажите, пожалуйста, в чем я ошибаюсь или ошибаюсь.
[Разработка среды]
Asp.Net Core(2.2.0)
EntityFrameworkCore.InMemory(2.2.4)
Swashbuckle.AspNetCore(4.0.1)
[ValuesController.cs]
[Route("api/[controller]")]
[ApiController]
public class ValuesController : ControllerBase
{
private MyDbContext _context;
public ValuesController(MyDbContext context)
{
_context = context;
}
// PUT api/values/5
[HttpPut("{id}")]
public void Put(int id)
{
// Create about 200 MB Data of string
var result = new Result()
{
Id = id,
Data = new string('*', 100 * 1024 * 1024)
};
// Push 200 MB Data to InMemoryDB and save changes
_context.Result.Add(result);
_context.SaveChanges();
}
// DELETE api/values/5
[HttpDelete("{id}")]
public void Delete(int id)
{
// find specific id result
var result = _context.Result.Find(id);
// if found, remove it and save changes
if (result != null)
{
// ** Memory usage not change when removing **
_context.Result.Remove(result);
_context.SaveChanges();
}
}
}
[MyDbContext.cs]
public class MyDbContext : DbContext
{
/// <summary>
/// DB context
/// </summary>
/// <param name="options"></param>
public MyDbContext(DbContextOptions<MyDbContext> options) : base(options)
{
}
/// <summary>
/// Data set of Some Result
/// </summary>
public DbSet<Result> Result { get; set; }
}
/// <summary>
/// Contains search result
/// </summary>
[Table("result")]
public class Result
{
/// <summary>
/// ID
/// </summary>
public int Id { get; set; }
/// <summary>
/// Data
/// </summary>
public string Data { get; set; }
}
[Program.cs]
public class Program
{
public static void Main(string[] args)
{
var host = CreateWebHostBuilder(args).Build();
using (var scope = host.Services.CreateScope())
{
var services = scope.ServiceProvider;
var context = services.GetRequiredService<MyDbContext>();
}
host.Run();
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>();
}
[Startup.cs]
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
// This method gets called by the runtime. Use this method to add services to the container.
public void ConfigureServices(IServiceCollection services)
{
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
services.AddDbContext<MyDbContext>(opt =>
opt.UseInMemoryDatabase("TestMemoryDb").UseQueryTrackingBehavior(QueryTrackingBehavior.NoTracking));
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v0.0.1", new Info
{
Title = "InMemoryDBTest",
Version = "v0.0.1",
Description = "InMemoryDBTest",
});
});
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseSwagger();
app.UseSwaggerUI(c =>
{
c.SwaggerEndpoint("/swagger/v0.0.1/swagger.json", "InMemoryDBTest V0.0.1");
c.RoutePrefix = string.Empty;
});
app.UseHttpsRedirection();
app.UseMvc();
}
}