1. 确保在startup文件中添加了身份验证服务。例如，在ConfigureServices方法中加入以下代码：

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme) .AddCookie(options => { options.Cookie.HttpOnly = true; options.ExpireTimeSpan = TimeSpan.FromMinutes(30); options.LoginPath = "/Account/Login"; options.LogoutPath = "/Account/LogOff"; });

2. 使用以下代码块替换HttpContext.SignInAsync方法中的旧代码：

var claims = new List { new Claim(ClaimTypes.Name, "UserName"), new Claim(ClaimTypes.Email, "Email"), new Claim(ClaimTypes.Role, "RoleName") };

var claimsIdentity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);

var authenticationProperties = new AuthenticationProperties { IsPersistent = true };

await HttpContext.SignInAsync( CookieAuthenticationDefaults.AuthenticationScheme, new ClaimsPrincipal(claimsIdentity), authenticationProperties);

3. 进一步检查代码，确保将要添加到cookie的声明中的名称与使用声明的名称匹配。