1. 首先，您需要将用户与要绑定的实体相关联。可以通过添加一个名为UserId的属性来实现此目的。在实体中添加以下代码：

public class MyEntity { public int Id { get; set; } public string Name { get; set; } public string UserId { get; set; } public ApplicationUser User { get; set; } }

2. 管理用户的控制器应注入UserManager和DbContext。您可以在此控制器中获取当前的用户ID，并使用它来构造实体。

public class MyEntitiesController : Controller { private readonly UserManager _userManager; private readonly ApplicationDbContext _context;

public MyEntitiesController(UserManager userManager, ApplicationDbContext context)
{
    _userManager = userManager;
    _context = context;
}

public async Task Create()
{
    var user = await _userManager.GetUserAsync(User);
    if (user == null)
    {
        return RedirectToAction("Login", "Account");
    }
    var myEntity = new MyEntity { UserId = user.Id };
    return View(myEntity);
}

[HttpPost]
[ValidateAntiForgeryToken]
public async Task Create(MyEntity myEntity)
{
    if (ModelState.IsValid)
    {
        var user = await _userManager.GetUserAsync(User);
        if (user == null)
        {
            return RedirectToAction("Login", "Account");
        }
        myEntity.UserId = user.Id;
        _context.Add(myEntity);
        await _context.SaveChangesAsync();
        return RedirectToAction(nameof(Index));
    }
    return View(myEntity);
}

}

3. 在视图中，您可以使用隐藏的输入来保持用户ID。表单提交时会将其传递给控制器，该控制器将其设置为实体的UserId属性。例如：

@model MyEntity