var claimsIdentity = this.User.Identity as ClaimsIdentity; var userId = claimsIdentity.FindFirst(ClaimTypes.Name)?.Value;
string userId = User.FindFirst(ClaimTypes.NameIdentifier)?.Value;
参考：https://www.it1352.com/2599186.html
标签：core,jwt,FindFirst,token,User,var,net,userId From： https://www.cnblogs.com/microsoft-zh/p/16985231.html