验证管理员权限（C#）

参考页面：

http://www.yuanjiaocheng.net/webapi/test-webapi.html

http://www.yuanjiaocheng.net/webapi/web-api-controller.html

http://www.yuanjiaocheng.net/webapi/config-webapi.html

http://www.yuanjiaocheng.net/webapi/web-api-route.html

http://www.yuanjiaocheng.net/webapi/parameter-binding.html

AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
WindowsPrincipal principal = (WindowsPrincipal)Thread.CurrentPrincipal;
WindowsIdentity identity = (WindowsIdentity)principal.Identity;
FastPrincipal prin = new FastPrincipal(identity);
isAdmin = prin.IsInRole(WindowsBuiltInRole.Administrator);