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IEqualityComparer that uses ReferenceEquals

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野趣味
野趣味 2020-11-28 09:33

Is there a default IEqualityComparer implementation that uses ReferenceEquals?

EqualityComparer.Default uses

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  • 情深已故
    情深已故 (楼主)
    2020-11-28 10:08

    Here's a simple implementation for C# 6 and later:

    public sealed class ReferenceEqualityComparer : IEqualityComparer, IEqualityComparer
{
    public static ReferenceEqualityComparer Default { get; } = new ReferenceEqualityComparer();

    public new bool Equals(object x, object y) => ReferenceEquals(x, y);
    public int GetHashCode(object obj) => RuntimeHelpers.GetHashCode(obj);
}


    Or a generic version:
    

    public sealed class ReferenceEqualityComparer : IEqualityComparer
{
    public static IEqualityComparer Default { get; } = new ReferenceEqualityComparer();

    public bool Equals(T x, T y) => ReferenceEquals(x, y);
    public int GetHashCode(T obj) => RuntimeHelpers.GetHashCode(obj);
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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