如何在asp.net Core2.0Web应用程序中获取浏览站点的用户的用户名？

string username = HttpContext.User.Identity.Name;

services.AddIdentity<IdentityUser, IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddDefaultTokenProviders();

private readonly UserManager<IdentityUser> _userManager;

public YourController(UserManager<IdentityUser> userManager)
{
    _userManager = userManager;
}

public async Task<IActionResult> YourAction()
{
    string username = await _userManager.GetUserNameAsync(HttpContext.User);
    // 其他操作
}