Parameter in C#

Question

When I want get total value of memory in C# I found a kernel32 function in MSDN to invoke data from system. MSDN declare function this way:

[return: MarshalAs(Un         


        

Answer 1

If you look at the function definition on MSDN it will tell you whether the parameters are In/Out:

BOOL WINAPI GlobalMemoryStatusEx(
  __inout  LPMEMORYSTATUSEX lpBuffer
);

In general if it says out, you should use a ref parameter, it makes is easier on any future developers trying to figure out how the code is working. When looking at the function call, you know the developer meant for the argument to be affected.