Marshal.SizeOf Method (Object)
Returns the unmanaged size of an object in bytes.
Assembly: mscorlib (in mscorlib.dll)
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.
Imports System Imports System.Runtime.InteropServices Public Structure Point Public x As Integer Public y As Integer End Structure Module Example Sub Main() ' Create a point struct. Dim p As Point p.x = 1 p.y = 1 Console.WriteLine("The value of first point is " + p.x.ToString + " and " + p.y.ToString + ".") ' Initialize unmanged memory to hold the struct. Dim pnt As IntPtr = Marshal.AllocHGlobal(Marshal.SizeOf(p)) Try ' Copy the struct to unmanaged memory. Marshal.StructureToPtr(p, pnt, False) ' Create another point. Dim anotherP As Point ' Set this Point to the value of the ' Point in unmanaged memory. anotherP = CType(Marshal.PtrToStructure(pnt, GetType(Point)), Point) Console.WriteLine("The value of new point is " + anotherP.x.ToString + " and " + anotherP.y.ToString + ".") Finally ' Free the unmanaged memory. Marshal.FreeHGlobal(pnt) End Try End Sub End Module
.NET FrameworkSupported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
.NET for Windows Phone appsSupported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.