[Fork] https://stackoverflow.com/questions/75421336/any-alternative-about-cs0233-for-sizeoft-in-structlayoutattribute | C# Online Compiler

[Fork] https://stackoverflow.com/questions/75421336/any-alternative-about-cs0233-for-sizeoft-in-structlayoutattribute by dbc_MinLength

using System;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

//https://stackoverflow.com/questions/75421336/any-alternative-about-cs0233-for-sizeoft-in-structlayoutattribute

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct Vector3<T> where T : unmanaged
{
    public T X, Y, Z;

    public Vector3(T x, T y, T z) => (X, Y, Z) = (x, y, z);
}
					
public class Program
{
	public static void Main()
	{
		try
		{
			Console.WriteLine($"Marshal.SizeOf<Vector3<int>>()={Marshal.SizeOf<Vector3<int>>()}");
		}
		catch (Exception ex)
		{
			Console.WriteLine($"Marshal.SizeOf<Vector3<int>>() failed with exception: {ex}");
		}
		
		try
		{
			Console.WriteLine($"Marshal.SizeOf<Nullable<int>>()={Marshal.SizeOf<Nullable<int>>()}");
		}
		catch (Exception ex)
		{
			Console.WriteLine($"Marshal.SizeOf<Nullable<int>>() failed with exception: {ex}");
		}
	}
}

​x
 
using System;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
​
//https://stackoverflow.com/questions/75421336/any-alternative-about-cs0233-for-sizeoft-in-structlayoutattribute
​
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct Vector3<T> where T : unmanaged
{
    public T X, Y, Z;
​
    public Vector3(T x, T y, T z) => (X, Y, Z) = (x, y, z);
}
                    
public class Program
{
    public static void Main()
    {
        try
        {
            Console.WriteLine($"Marshal.SizeOf<Vector3<int>>()={Marshal.SizeOf<Vector3<int>>()}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Marshal.SizeOf<Vector3<int>>() failed with exception: {ex}");
        }
        
        try
        {
            Console.WriteLine($"Marshal.SizeOf<Nullable<int>>()={Marshal.SizeOf<Nullable<int>>()}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Marshal.SizeOf<Nullable<int>>() failed with exception: {ex}");
        }
    }
}

Environment version: .NET 9.0.0 (9.0.0)
System.Text.Json version: System.Text.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51

Testing deserialization of "" to type System.Nullable`1[System.DateTime]:
   Succeeded, value = null
Testing deserialization of "" to type System.Nullable`1[System.Int32]:
   Succeeded, value = null
Testing deserialization of "" to type System.Nullable`1[System.Double]:
   Succeeded, value = null
Testing deserialization of "" to type System.Nullable`1[System.Decimal]:
   Succeeded, value = null
Testing round-trip of System.Nullable`1[System.DateTime] 06/12/2025 00:22:53
   Passed.
Testing round-trip of System.Nullable`1[System.DateTime]
   Passed.
Testing round-trip of System.DateTime 06/12/2025 00:22:53
   Passed.
Testing round-trip of System.Nullable`1[System.Int32] 1
   Passed.
Testing round-trip of System.Nullable`1[System.Int32]
   Passed.
Testing round-trip of System.Nullable`1[System.Decimal] 1.010101
   Passed.
Testing round-trip of System.Nullable`1[System.Decimal]
   Passed.
Testing round-trip of System.Nullable`1[System.Double] 1.010101
   Passed.
Testing round-trip of System.Nullable`1[System.Double]
   Passed.

Cached Result
Last Run:	12:22:52 am
Compile:	0.061s
Execute:	0.21s
Memory:	20.87Mb
CPU:	0.271s

View IL Code