Examples of errors detected by the V3192 diagnostic

V3192. Type member is used in the 'GetHashCode' method but is missing from the 'Equals' method.

ScottPlot

V3192 The 'Max' property is used in the 'GetHashCode' method but is missing from the 'Equals' method. ScottPlot CoordinateRangeMutable.cs 198

public class CoordinateRangeMutable : IEquatable<CoordinateRangeMutable>
{
  ....
  public bool Equals(CoordinateRangeMutable? other)
  {
    if (other is null)
      return false;

    return Equals(Min, other.Min) && Equals(Min, other.Min);  // <=
  }

  public override bool Equals(object? obj)
  {
    if (obj is null)
      return false;

    if (obj is CoordinateRangeMutable other)
      return Equals(other);

    return false;
  }

  public override int GetHashCode()
  {
    return Min.GetHashCode() ^ Max.GetHashCode();             // <=
  }
}

QuantConnect Lean

V3192 The 'Legs' property is used in the 'GetHashCode' method but is missing from the 'Equals' method. OptionStrategyDefinitionMatch.cs 176

public override int GetHashCode()
{
  unchecked
  {
    var hashCode = Definition.GetHashCode();
    var arr = new int[Legs.Count];
    for (int i = 0; i < Legs.Count; i++)
    {
      arr[i] = Legs[i].GetHashCode();
    }

    Array.Sort(arr);

    for (int i = 0; i < arr.Length; i++)
    {
      hashCode = (hashCode * 397) ^ arr[i];
    }

    return hashCode;
  }
}

public override bool Equals(object obj)
{
    ....

    return Equals((OptionStrategyDefinitionMatch) obj);
}

public bool Equals(OptionStrategyDefinitionMatch other)
{
  ....

  var positions = other.Legs
                        .ToDictionary(leg => leg.Position,
                                      leg => leg.Multiplier);
  foreach (var leg in other.Legs)
  {
    int multiplier;
    if (!positions.TryGetValue(leg.Position, out multiplier))
    {
      return false;
    }

    if (leg.Multiplier != multiplier)
    {
      return false;
    }
  }

  return true;
}