Code Access Security(CAS) check.
CLR 会检查执行线程的call stack 中的所有assembly是否有权限访问受限制的资源.
否,则抛出SecurityException.
QueueUserWorkItem会把调用线程的权限赋给线程池中的线程,但是遍历调用线程的callstack
检查权限是一个耗时的操作,所以有了UnsafeQueueUserWorkItem().
调用UnsafeQueueUserWorkItem()的函数需要SecurityPermission,并把ControlPolicy和
ControlEvidenc打开.
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