如何将IntPtr转换回对象

using System;
using System.Runtime.InteropServices;

public class Example
{
    [StructLayout(LayoutKind.Sequential)]
    public struct MyStruct
    {
        public int field1;
        public double field2;
    }

    public static void Main()
    {
        MyStruct myStruct = new MyStruct();
        myStruct.field1 = 42;
        myStruct.field2 = 3.14;

        IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(myStruct));
        Marshal.StructureToPtr(myStruct, ptr, false);

        MyStruct convertedStruct = (MyStruct)Marshal.PtrToStructure(ptr, typeof(MyStruct));

        Console.WriteLine("field1: {0}, field2: {1}", convertedStruct.field1, convertedStruct.field2);

        Marshal.FreeHGlobal(ptr);
    }
}