Packs the current instance into a System.Threading.NativeOverlapped structure, specifying the delegate to invoke when the asynchronous I/O operation is complete and the managed object that serves as a buffer. Does not propagate the calling stack.
Syntax
[System.Runtime.InteropServices.ComVisible(false)]
public NativeOverlapped* UnsafePack (IOCompletionCallback iocb, object userData)
Parameters
- iocb
- userData
Returns
An unmanaged pointer to a System.Threading.NativeOverlapped structure.
Remarks
The unmanaged pointer returned by this method can be passed to the operating system in overlapped I/O operations. The System.Threading.NativeOverlapped structure is fixed in physical memory until Overlapped.Unpack(NativeOverlapped*) is called.
The buffer or buffers specified in userData must be the same as those passed to the unmanaged operating system function that performs the asynchronous I/O.
The runtime pins the buffer or buffers specified in userData for the duration of the I/O operation. If the application domain is unloaded, the runtime keeps the memory pinned until the I/O operation completes.
Using the Overlapped.UnsafePack(IOCompletionCallback, object) method could inadvertently open up a security hole. Code access security bases its permission checks on the permissions of all the callers on the stack. The Overlapped.UnsafePack(IOCompletionCallback, object) method does not propagate the calling stack. Malicious code might be able to exploit this to avoid permission checks.
Requirements
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0
Since: .NET 2.0