You put it on the method you're importing from Kernel32.dll.
For example,
static class Class
{
[DllImport("Kernel32.dll")]
static extern Boolean Beep(UInt32 frequency, UInt32 duration);
public static void methodRequiringStuffFromKernel32()
{
// code here...
Beep(...);
}
}
From @dtb: Note that the class should be named NativeMethods
, SafeNativeMethods
or UnsafeNativeMethods
. See Naming Convention for Unmanaged Code Methods for more details.
CA1060: Move P/Invokes to NativeMethods class:
NativeMethods - This class does not suppress stack walks for unmanaged code permission. (System.Security.SuppressUnmanagedCodeSecurityAttribute must not be applied to this class.) This class is for methods that can be used anywhere because a stack walk will be performed.
SafeNativeMethods - This class suppresses stack walks for unmanaged code permission. (System.Security.SuppressUnmanagedCodeSecurityAttribute is applied to this class.) This class is for methods that are safe for anyone to call. Callers of these methods are not required to perform a full security review to make sure that the usage is secure because the methods are harmless for any caller.
UnsafeNativeMethods - This class suppresses stack walks for unmanaged code permission. (System.Security.SuppressUnmanagedCodeSecurityAttribute is applied to this class.) This class is for methods that are potentially dangerous. Any caller of these methods must perform a full security review to make sure that the usage is secure because no stack walk will be performed.
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