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01.23.2008 at 11:24AM PST, ID: 23105524
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Overloading the == operator and the GetHashCode() method...

Asked by kalliopi in .Net Editors & IDEs, Microsoft Visual C#.Net, .NET Framework 2.0

Tags: int, method, unique

Hi,

I have a class called foo (below) that overloads the == operator.  But I'm getting a warning on compile:

'foo' defines operator == or operator != but does not override Object.GetHashCode()

This makes sense since I could have two totally seperate instances in memory, but if they have the same Id, they would return true for ==, but would generate two different hash codes since the base implementation is based on their location in memory.  The question is how can I reliably convert my unique Guid Id field into a reliable int hash code to use in my overriden GetHashCode() method?
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public class foo {
  public Guid Id;
  public static bool operator ==(foo f1, foo f2) {
    return f1.Id == f2.Id;
  }
}
 
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[+][-]01.23.2008 at 11:29AM PST, ID: 20726586

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[+][-]01.23.2008 at 12:09PM PST, ID: 20727035

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[+][-]01.23.2008 at 12:30PM PST, ID: 20727325

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[+][-]01.23.2008 at 02:16PM PST, ID: 20728495

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[+][-]01.23.2008 at 02:30PM PST, ID: 20728611

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[+][-]01.23.2008 at 02:32PM PST, ID: 20728627

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[+][-]01.23.2008 at 03:41PM PST, ID: 20729156

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[+][-]01.23.2008 at 05:08PM PST, ID: 20729735

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About this solution

Zones: .Net Editors & IDEs, Microsoft Visual C#.Net, .NET Framework 2.0
Tags: int, method, unique
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Solution Provided By: GreenGhost
Participating Experts: 2
Solution Grade: A
 
 
[+][-]01.24.2008 at 07:46AM PST, ID: 20734020

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