Right way to implement GetHashCode for this struct

Question

I want to use a date range (from one date to another date) as a key for a dictionary, so I wrote my own struct:

   struct DateRange
   {
      public DateTime St         


        

Answer 1

Something like this:) with a different prime number:)

public override int GetHashCode()
{
    unchecked  
    {
        int hash = 23;
        // Suitable nullity checks etc, of course :)
        hash = hash * 31 + Start.GetHashCode();
        hash = hash * 31 + End.GetHashCode();
        return hash;
    }
}

This is not the fastest implementation but it produces a good hash code. Joshua bloch indicates that as well and you also calculate the performance, ^ is usually faster. correct me if i m wrong.

See Jon Skeets impl for c# :