RuntimeHelpers.PrepareConstrainedRegions Method ()
Designates a body of code as a constrained execution region (CER).
Assembly: mscorlib (in mscorlib.dll)
Compilers use this method to mark catch, finally, and fault blocks as constrained execution regions (CERs). Code that is marked as a constrained region must only call other code with strong reliability contracts. It should not allocate or make virtual calls to unprepared or unreliable methods unless it is prepared to handle failures.
Note that no intermediate language opcodes, except NOP, are allowed between a call to the PrepareConstrainedRegions method and the try block. For more information about CERs, see the classes in the System.Runtime.ConstrainedExecution namespace.
CERs that are marked using the PrepareConstrainedRegions method do not work perfectly when a StackOverflowException is generated from the try block. For more information, see the ExecuteCodeWithGuaranteedCleanup method.
The PrepareConstrainedRegions method calls the ProbeForSufficientStack method.
The following example shows how to reliably set handles by using the PrepareConstrainedRegions method. To reliably set a handle to a specified pre-existing handle, you must ensure that the allocation of the native handle and the subsequent recording of that handle within a SafeHandle object is atomic. Any failure between these operations (such as a thread abort or out-of-memory exception) will result in the native handle being leaked. You can use the PrepareConstrainedRegions method to make sure that the handle is not leaked.
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Available since 2.0