Marshal.SizeOf structure returns excessive number

Question

I have the following structure

[StructLayout(LayoutKind.Sequential)]
public struct SFHeader
{

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 5)]
    pu         


        

Answer 1

You could use a fixed size buffer instead of a string.

[StructLayout(LayoutKind.Sequential)]
public unsafe struct SFHeader
{
    public fixed char FileName[5];
    public int Offset;
    public short Size;
    public byte Flags;
    public byte Source;
    public long LastWriteTime;

    public byte[] GetBytes()
    {
        //omitted
    }

    public static SFHeader FromBytes(byte[] buffer)
    {
        //omitted
    }
}