Creating Hash Codes

Sometimes you need to override the Equals method and Microsoft suggests you should override also the GetHashCode method for better performance of hashing collections.
Here is a simple implementation of a HashCodeCalculator:

namespace Util
{
  // PRIMARY numbers
  private static int Base = 443;
  private static int Factor = 449;

  public static int Create(params object[] fields)
  {
    unchecked // Wrap on overflow 
    {
      int value = Base;

      foreach (var f in fields)
      {
        if (f != null)
          value = value * Factor + f.GetHashCode();
      }
      return value;
    }
  }
}