void BigToLitle(object obj)
 {
    Type mytype = obj.GetType(); 
     if (mytype.Equals(typeof(struct)))  
     {
     }     
}

 public void enumFields(Type t)
        {
            foreach (var fi in t.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance))
            {
                Type fieldType = fi.FieldType;
                IntPtr offset = Marshal.OffsetOf(t, fi.Name);                
                int fieldSize = Marshal.SizeOf(fieldType);
                if (!fieldType.IsNested)
                {
                    Console.WriteLine("field: {0} {1} {2}", fieldType.Name, offset, fieldSize);
                }
                else
                {
                    FixedBufferAttribute fa = (FixedBufferAttribute)fi.GetCustomAttribute(typeof(FixedBufferAttribute));
                    if (fa != null)
                    {
                        Type elementType = fa.ElementType;
                        var count = fa.Length;
                        fieldSize = Marshal.SizeOf(elementType);
                        Console.WriteLine("array: {0} {1} {2} {3}", elementType.Name, offset, fieldSize,count);
                    }
                }

            }
        }

unsafe struct A
    {

        Int32 a;
        Int16 b;
        UInt16 c;
        Int32 d;
        Int64 g;
        double h;
        SByte w;
        fixed Int16 rr[5];
        Single v;
        int er;
    }

FixedBufferAttribute fa = (FixedBufferAttribute)fi.GetCustomAttribute(typeof(FixedBufferAttribute));

using System.Runtime.CompilerServices;