注入IOptions实例<>

我需要访问我的jwtsettings的值。我试图注入一个 IOPOTIONS<gt; 类的构造函数,但我遇到了问题:

 public class JwtHandler : IJwtHandler
 {
    private readonly JwtSettings _jwtSettings;

    public JwtHandler(IOptions<JwtSettings> jwtSettings)
    {
        jwtSettings = _jwtSettings.Value;
    } 
 }

我有错误:

The type or namespace name 'IOptions<>' could not be found 
(are you missing a using directive or an assembly reference?)

当我添加使用时:

using Microsoft.Extensions.Options;

vs告诉我这是不必要的。

更新的 :我的程序集:

Microsoft.IdentityModel.Tokens    
System.IdentityModel.Tokens.Jwt