尝试从 header 获取角色声明时，获取 NullReferenceException 和 object 引用未设置为 object 的实例

Question

im trying to get the role claim and verify the it before adding a new user

var role = _httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.Role).Value;

i have already registered service in programs.cs

builder.Services.AddHttpContextAccessor();

and initialized well

  private readonly IHttpContextAccessor _httpContextAccessor;

    public DBService(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

Any help would be much appreciated!

Answer 1

i have found the answer... this line was looking for a claimtype Role

var role = _httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.Role).Value;

so i change how claims syntax was written to include the claimtype

 new Claim(ClaimTypes.Role, role.ToString()),