How to obtain constructor values for SecurityPermissionAttribute via reflection

I'm trying to obtain the arguments for the SecurityPermissionAttribute but nothing returns during reflection. Can't seem to get the "SecurityAction.Demand, ControlThread=true" values

I'm using the reflection only load context:

MethodBase.GetCustomAttributesData()

running against: mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 C:\Windows\Microsoft.NET\Framework64\v4.0.30319\mscorlib.dll

Class: System.Threading.Thread System.Threading.Thread

[System.Security.SecuritySafeCritical] // auto-generated [Obsolete("Thread.Suspend has been deprecated. Please use other classes in System.Threading, such as Monitor, Mutex, Event, and Semaphore, to synchronize Threads or protect resources. http://go.microsoft.com/fwlink/?linkid=14202", false)][SecurityPermission(SecurityAction.Demand, ControlThread=true)] [SecurityPermission(SecurityAction.Demand, ControlThread=true)] public void Suspend() { SuspendInternal(); }