获取当前登录用户的SecurityToken

Question

是否可以从HttpContext.Current.User获取System.IdentityModel.Tokens.SecurityToken对象？

这就是我能够得到的：

IPrincipal userPrincipal = HttpContext.Current.User; 
WindowsIdentity userIdentity = userPrincipal.Identity as WindowsIdentity; 
IntPtr token = userIdentity.Token; 

但是，由于以下错误，我无法获得SecurityToken：

Cannot convert type 'System.IntPtr' to 'System.IdentityModel.Tokens.SecurityToken' via a reference conversion, boxing conversion, unboxing conversion, wrapping conversion, or null type conversion 

更新

看起来获取SecurityToken的方法是使用BootstrapContext：

BootstrapContext bootstrapContext = ClaimsPrincipal.Current.Identities.First().BootstrapContext as BootstrapContext;
var token = bootstrapContext.SecurityToken;

并且，在web.config中：

<identityConfiguration saveBootstrapContext="true">