Marshal.SizeOf Method (Object)
Returns the unmanaged size of an object in bytes.
Assembly: mscorlib (in mscorlib.dll)
The structure parameter is a null reference (Nothing in Visual Basic).
This method accepts an instance of a structure, which can be a reference type or a boxed value type. The layout must be sequential or explicit.
The size returned is the size of the unmanaged object. 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.
The following example creates a managed structure, transfers it to unmanaged memory, and then transfers it back to managed memory. This example uses the SizeOf method to determine how much unmanaged memory to allocate.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.