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C# - Generic HashCode implementation for classes

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独厮守ぢ
独厮守ぢ 2021-01-02 05:17

I\'m looking at how build the best HashCode for a class and I see some algorithms. I saw this one : Hash Code implementation, seems to be that .NET classes HashCode methods

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  • 猫巷女王i
    猫巷女王i (楼主)
    2021-01-02 05:33

    This is what I'm using:

    public static class ObjectExtensions
{
    /// 
    /// Simplifies correctly calculating hash codes based upon
    /// Jon Skeet's answer here
    /// http://stackoverflow.com/a/263416
    /// 
    /// 
    /// Thunks that return all the members upon which
    /// the hash code should depend.
    /// 
    public static int CalculateHashCode(this object obj, params Func[] memberThunks)
    {
        // Overflow is okay; just wrap around
        unchecked
        {
            int hash = 5;
            foreach (var member in memberThunks)
                hash = hash * 29 + member().GetHashCode();
            return hash;
        }
    }
}



    Example usage:
    


    public class Exhibit
{
    public virtual Document Document { get; set; }
    public virtual ExhibitType ExhibitType { get; set; }

    #region System.Object
    public override bool Equals(object obj)
    {
        return Equals(obj as Exhibit);
    }

    public bool Equals(Exhibit other)
    {
        return other != null &&
            Document.Equals(other.Document) &&
            ExhibitType.Equals(other.ExhibitType);
    }

    public override int GetHashCode()
    {
        return this.CalculateHashCode(
            () => Document, 
            () => ExhibitType);
    }
    #endregion
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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