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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.marshal.sizeof below:

Marshal.SizeOf Method (System.Runtime.InteropServices) | Microsoft Learn

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Source:: Marshal.cs

Returns the unmanaged size of an object in bytes.

public:
 static int SizeOf(System::Object ^ structure);

[System.Obsolete("SizeOf(Object) may be unavailable in future releases. Instead, use SizeOf<T>(). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296514")]
public static int SizeOf(object structure);

public static int SizeOf(object structure);

[System.Runtime.InteropServices.ComVisible(true)]
public static int SizeOf(object structure);

[<System.Obsolete("SizeOf(Object) may be unavailable in future releases. Instead, use SizeOf<T>(). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296514")>]
static member SizeOf : obj -> int

static member SizeOf : obj -> int

[<System.Runtime.InteropServices.ComVisible(true)>]
static member SizeOf : obj -> int

Public Shared Function SizeOf (structure As Object) As Integer

Parameters

structure: Object

The object whose size is to be returned.

Returns

The size of the specified object in unmanaged code.

Attributes

Exceptions

The structure parameter is null.

Examples

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.

using System;
using System.Runtime.InteropServices;

public struct Point
{
    public int x;
    public int y;
}

class Example
{

    static void Main()
    {

        // Create a point struct.
        Point p;
        p.x = 1;
        p.y = 1;

        Console.WriteLine("The value of first point is " + p.x + " and " + p.y + ".");

        // Initialize unmanged memory to hold the struct.
        IntPtr pnt = Marshal.AllocHGlobal(Marshal.SizeOf(p));

        try
        {

            // Copy the struct to unmanaged memory.
            Marshal.StructureToPtr(p, pnt, false);

            // Create another point.
            Point anotherP;

            // Set this Point to the value of the
            // Point in unmanaged memory.
            anotherP = (Point)Marshal.PtrToStructure(pnt, typeof(Point));

            Console.WriteLine("The value of new point is " + anotherP.x + " and " + anotherP.y + ".");
        }
        finally
        {
            // Free the unmanaged memory.
            Marshal.FreeHGlobal(pnt);
        }
    }
}

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

Remarks

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.

You can use the SizeOf method to determine how much unmanaged memory to allocate using the AllocHGlobal and AllocCoTaskMem methods.