[Supported in the .NET Framework 4.5.1 and later versions]
Returns the size of an unmanaged type in bytes.
Assembly: mscorlib (in mscorlib.dll)
You can use this method when you do not have a structure. The layout must be sequential or explicit.
The size returned is the size of the unmanaged type. The unmanaged and managed sizes of an object can differ. For character types, the size is affected by the CharSet value applied to that class.