VB.NET and sizeof

Question

I'm converting some code from C# to VB.NET. I have the following line in C#

var bytes = new byte[password.Length * sizeof(char)];

Looking on MSDN it appears that VB.NET does not seem to have the sizeof operator. I understand there is a Marshal.SizeOf but further MSDN documentation states that the value returned can be different to that of sizeof.

Can anybody help? Is there an equivalent statement in VB.NET?

Additional Information

My aim is to convert a password into an array of bytes which I can then hash and then either store in a database or compare to a previously stored hash. But I don't necessarily want an answer relating to my particular situation.

Dim bytes(password.Length * xxx) As Byte
System.Buffer.BlockCopy(password.ToCharArray(), 0, bytes, 0, bytes.Length)
Dim sha512 = System.Security.Cryptography.SHA512.Create()
Dim hash = sha512.ComputeHash(bytes)

' compare hash or stroe in database

Answer 1

The 'Len' operator in VB will do this (but it works on instances, so you need to adjust accordingly):

Dim bytes = New Byte((someString.Length * Len(New Char)) - 1){}

Answer 2

VB.NET's Char maps to .NET's System.Char, which is defined in ECMA 335 to be a 16-bit Unicode character. Meaning, Char has a fixed size (no matter on which platform you compile or run your code), you don't actually need sizeof.

Therefore, just multiply by 2.