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Generate Equals, GetHashCode and operators methods from properties.
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This is an add-in for Fody

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Generate Equals, GetHashCode and operators methods from properties for class decorated with a [Equals] Attribute.

Usage

See also Fody usage.

NuGet installation

Install the Equals.Fody NuGet package and update the Fody NuGet package:

PM> Install-Package Fody
PM> Install-Package Equals.Fody

The Install-Package Fody is required since NuGet always defaults to the oldest, and most buggy, version of any dependency.

Add to FodyWeavers.xml

Add <Equals/> to FodyWeavers.xml

<Weavers>
  <Equals/>
</Weavers>

Your Code

[Equals]
public class Point
{
    public int X { get; set; }
    
    public int Y { get; set; }
    
    [IgnoreDuringEquals]
    public int Z { get; set; }
    
    [CustomEqualsInternal]
    bool CustomLogic(Point other)
    {
        return Z == other.Z || Z == 0 || other.Z == 0;
    }
}

[Equals]
public class CustomGetHashCode
{
    public int X { get; set; }

    [IgnoreDuringEquals]
    public int Z { get; set; }

    [CustomGetHashCode]
    int CustomGetHashCodeMethod()
    {
        return 42;
    }
}

What gets compiled

public class Point : IEquatable<Point>
{
    public int X { get; set; }

    public int Y { get; set; }

    public int Z { get; set; }
    
    bool CustomLogic(Point other)
    {
        return Z == other.Z || Z == 0 || other.Z == 0;
    }

    public static bool operator ==(Point left, Point right)
    {
        return object.Equals((object)left, (object)right);
    }

    public static bool operator !=(Point left, Point right)
    {
        return !object.Equals((object)left, (object)right);
    }

    static bool EqualsInternal(Point left, Point right)
    {
        return left.X == right.X && left.Y == right.Y && leftt.CustomLogic(right);
    }

    public virtual bool Equals(Point right)
    {
        return !object.ReferenceEquals((object)null, (object)right) && (object.ReferenceEquals((object)this, (object)right) || Point.EqualsInternal(this, right));
    }

    public override bool Equals(object right)
    {
        return !object.ReferenceEquals((object)null, right) && (object.ReferenceEquals((object)this, right) || this.GetType() == right.GetType() && Point.EqualsInternal(this, (Point)right));
    }

    public override int GetHashCode()
    {
        return unchecked(this.X.GetHashCode() * 397 ^ this.Y.GetHashCode());
    }
}

public class CustomGetHashCode : IEquatable<CustomGetHashCode>
{
    public int X { get; set; }

    public int Z { get; set; }

    int CustomGetHashCodeMethod()
    {
        return 42;
    }

    static bool EqualsInternal(CustomGetHashCode left, CustomGetHashCode right)
    {
        return left.X == right.X;
    }

    public override bool Equals(CustomGetHashCode other)
    {
        return !object.ReferenceEquals(null, other) && (object.ReferenceEquals(this, other) || CustomGetHashCode.EqualsInternal(this, other));
    }

    public override bool Equals(object obj)
    {
        return !object.ReferenceEquals(null, obj) && (object.ReferenceEquals(this, obj) || (base.GetType() == obj.GetType() && CustomGetHashCode.EqualsInternal(this, (CustomGetHashCode)obj)));
    }

    public override int GetHashCode()
    {
        return (this.X.GetHashCode() * 397) ^ this.CustomGetHashCodeMethod();
    }

    public static bool operator ==(CustomGetHashCode left, CustomGetHashCode right)
    {
        return object.Equals(left, right);
    }

    public static bool operator !=(CustomGetHashCode left, CustomGetHashCode right)
    {
        return !object.Equals(left, right);
    }
}

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