To set the affinity of CPUs using C#

Question

I have created a window application in C#.Now I want to set the CPU affinity for this application.I may have 2 processors,4 processors,8 processors or may be more than 8 process

Answer 1

System.Diagnostics.Process.ProcessorAffinity

What do you want to use Environment.ProcessorCount for? User input validation? Anyway if you want to select a particular processor (#1 or #2 or #3...), create a bitmask like that:

if (userSelection <= 0 || userSelection > Environment.ProcessorCount)
{
    throw new ArgumentOutOfRangeException();
}

int bitMask = 1 << (userSelection - 1);
Process.GetCurrentProcess().ProcessorAffinity = (IntPtr)bitMask;

Where userSelection - is a number of selected processor.

If you'd like to select more than one processor, then do

bitMask |= 1 << (anotherUserSelection - 1);

for each user selection