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Compiler Warning (level 3) CS0659
Compiler Warning (level 3) CS0659
09/05/2018
CS0659
CS0659
63435ee6-c92f-4124-95d4-d8f4e5f0af80

Compiler Warning (level 3) CS0659

'class' overrides Object.Equals(object o) but does not override Object.GetHashCode()

The compiler detected an override of the xref:System.Object.Equals%2A?displayProperty=nameWithType method but no override of the xref:System.Object.GetHashCode%2A?displayProperty=nameWithType method. An override of xref:System.Object.Equals%2A implies that you also want to override xref:System.Object.GetHashCode%2A.

The following code generates CS0659:

// CS0659.cs  
// compile with: /W:3 /target:library  
class Test
{  
   public override bool Equals(object o) { return true; }   // CS0659  
}  
  
// OK  
class Test2  
{  
   public override bool Equals(object o) { return true; }  
   public override int GetHashCode() { return 0; }  
}

See also