C# 获取Header中的token值

  public CurrentUser currentUser
        {
            get
            {
                CurrentUser result = new CurrentUser();
                //jwt 解密token
                IJsonSerializer serializer = new JsonNetSerializer();
                IDateTimeProvider provider = new UtcDateTimeProvider();
                IJwtValidator validator = new JwtValidator(serializer, provider);
                IBase64UrlEncoder urlEncoder = new JwtBase64UrlEncoder();
                IJwtDecoder decoder = new JwtDecoder(serializer, validator, urlEncoder);
                string authHeader = this.Request.Headers["Authorization"];//Header中的token
                // Add JWT　Protection
                if (authHeader != null && authHeader.StartsWith("Bearer"))
                {
                    string token = authHeader.Substring("Bearer ".Length).Trim();
                    var requestService = HttpContext.RequestServices;
                    var conf = requestService.GetService(typeof(IConfiguration)) as IConfiguration;
                    var secretKey = conf["AAA:BBB"];//密钥信息
                    string resultstr = decoder.Decode(token, secretKey, verify: true);//token为之前生成的字符串

                    result = JsonConvert.DeserializeObject<CurrentUser>(resultstr);//反序列化 将jwt中的信息解压出来
                }
                else
                {
                    //Handle what happens if that isn't the case
                    throw new Exception("The authorization header is either empty or isn't Basic.");
                }
                return result;
            }
        }

 另外可以用：

JwtSecurityTokenHandler 

　　　　　　　
　　　　　　　　　　// HttpContext context
　　　　　　　　　string strAuthHeader = context.Request.Headers["Authorization"];//获取Header中的token

            if (string.IsNullOrWhiteSpace(strAuthHeader) == false && strAuthHeader!= "Bearer undefined" && (strAuthHeader.StartsWith("Bearer") || strAuthHeader.StartsWith("bearer")))
            {
                string jwt = strAuthHeader.Substring("Bearer ".Length).Trim();
                var handler = new JwtSecurityTokenHandler();
                var token = handler.ReadJwtToken(jwt);
                var cid = new ClaimsIdentity(token.Claims, "Value1", "Value2", "Value3");
                context.CurrentUser = new ClaimsPrincipal(cid);//返回到content.CurrentUser 中
            }
// 取值 HttpContext.User.Claims.FirstOrDefault(t => t.Type == "name")?.Value;

 具体参考：

Creating And Validating JWT Tokens In C# .NET - .NET Core Tutorials (dotnetcoretutorials.com)