fastest way to make a readonly copy of an array of structure?

I'm currently using something like

c#
var myvar = directcast(myarrayofstruct.clone(), mystru开发者_如何学JAVAc());

vb.net
dim myvar = directcast(myarrayofstruct.clone, mystruc())

is there a better way?

Calling Clone() is about as fast as you'll get, yes.