public function genericcast(of u, v)(byval obj as u) as v
　return ctype(obj, v)
end function

return directcast(directcast(obj, object), v)

return (v)(object)obj;

public function genericcast(of u, v)(byval obj as u) as v
　return ctype(directcast(obj, object), v)
end function

static v genericcast<u, v>(u obj)
{
　iconvertible convertibleobj = obj as iconvertible;
　if (convertibleobj != null)
　{
　　type t = typeof(v);

　　switch (type.gettypecode(t))
　　{
　　　case typecode.boolean:
　　　　return (v)(object)convertibleobj.toboolean(null);
　　　case typecode.byte:
　　　　return (v)(object)convertibleobj.tobyte(null);
　　　case typecode.char:
　　　　return (v)(object)convertibleobj.tochar(null);

　　　//.........
　　　default:
　　　　//none of them, use the following default way..
　　　　break;
　　}
　}
　return (v)(object)obj;
}

static v genericcast<u, v>(u obj)
{
　return (v)convert.changetype(obj, typeof(v));
}

public function genericcast(of u, v)(byval obj as u) as v
try
　return ctype(directcast(obj, object), v)
　catch ex as invalidcastexception return directcast( _
　　compilerservices.conversions.changetype(obj, gettype(v)), v)
　end try
end function