oxyplot/Source/OxyPlot/Utilities/HashCodeBuilder.cs at develop · CodingConnected/oxyplot · GitHub

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// --------------------------------------------------------------------------------------------------------------------

// <copyright file="HashCodeBuilder.cs" company="OxyPlot">

// </copyright>

// <summary>

// Provides functionality to calculate hash codes.

// </summary>

// --------------------------------------------------------------------------------------------------------------------

#nullable enable

namespace OxyPlot

{

using System.Collections.Generic;

using System.Linq;

/// <summary>

/// Provides functionality to calculate hash codes.

/// </summary>

public static class HashCodeBuilder

{

/// <summary>

/// Calculates a hash code for the specified sequence of items.

/// </summary>

/// <param name="items">A sequence of items.</param>

/// <returns>A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table.</returns>

public static int GetHashCode(IEnumerable<object> items)

{

// See http://stackoverflow.com/questions/263400/what-is-the-best-algorithm-for-an-overridden-system-object-gethashcode

// Overflow is fine, just wrap

unchecked

{

return items.Where(item => item != null).Aggregate(17, (current, item) => (current * 23) + item.GetHashCode());

}