This is an add-in for Fody

Generate shallow clone methods for objects with the IFastClone interface.

Introduction to Fody.

The nuget package

https://www.nuget.org/packages/FastClone.Fody

PM> Install-Package FastClone.Fody

Your Code

class SomeClass : IFastClone<SomeClass>
{
    public int ValueA { get; set; }

    public double ValueB { get; set; }
    
    public SomeClass FastClone()
    {
        throw new NotImplementedException();
    }
}

What gets compiled

class SomeClass : IFastClone<SomeClass>
{
    public int ValueA { get; set; }

    public double ValueB { get; set; }

    public SomeClass FastClone()
    {
        return SomeClass.CloneMethod(this);
    }

    private static SomeClass CloneMethod(SomeClass source)
    {
        return new SomeClass()
        {
            ValueA = Source.ValueA,
            ValueB = Source.ValueB                        
        }
    }
}

Usage

You must define the interface IFastClone, and add it to any class that you wish FastClone to rewrite

interface IFastClone<T>
{
    T FastClone();
}

Why?

Well, for one, I needed an excuse to play around with Fody :)

That said, this approach to cloning is slightly faster than MemberwiseClone (Most of the time). The benchmark below measures the FastClone vs MemberwiseClone of cloning 100k objects.

BenchmarkDotNet=v0.10.8, OS=Windows 10 Redstone 2 (10.0.15063)
Processor=Intel Core i7-4770HQ CPU 2.20GHz (Haswell), ProcessorCount=4
Frequency=10000000 Hz, Resolution=100.0000 ns, Timer=UNKNOWN
  [Host]     : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2098.0
  DefaultJob : Clr 4.0.30319.42000, 32bit LegacyJIT-v4.7.2098.0

Method	Mean	Error	StdDev
FastCloneMethod	27.05 ms	0.4584 ms	0.4288 ms
MemberwiseCloneMethod	36.42 ms	0.2711 ms	0.2536 ms