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I am having problem with understanding what FEATURE_PAL compiler directive means in .net 4.0 source code. It is used almost in every class that access unmanaged code.
PAL = Platform Adaptation Layer. It is first and foremost a detail of the CLR, insulating it from the operating system implementation. You’ll indeed see it used in the Reference Source copy of the source code for the .NET 4 classes. It appears in any code that has a strong dependency on the underlying operating system implementation, bypassing such code since it cannot work on an operating system other than Windows.