Dolly

Clone .net objects using source generation

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Table of Contents

• About the Project
• Getting Started
• Example
• Benchmarks

About The Project

Generate c# code to clone objects on the fly.

Getting Started

• Add the Dolly nuget and add [Clonable] attribute to a class and ensure that the class is marked as partial.
• Add [CloneIgnore] to any property or field that you don't want to include in the clone.
• Call DeepClone() or ShallowClone() on the object.

Example

[Clonable]
public partial class SimpleClass
{
    public string First { get; set; }
    public int Second { get; set; }
    [CloneIgnore]
    public float DontClone { get; set; }
}

Should generate

partial class SimpleClass : IClonable<SimpleClass>
{
    
    object ICloneable.Clone() => this.DeepClone();

    public SimpleClass DeepClone() =>
        new SimpleClass()
        {
            First = First,
            Second = Second
        };

    public SimpleClass ShallowClone() =>
        new SimpleClass()
        {
            First = First,
            Second = Second
        };
}

Benchmarks

Method	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen0	Allocated	Alloc Ratio
FastCloner.SourceGenerator	64.48 ns	1.323 ns	3.145 ns	64.11 ns	0.46	0.03	0.0094	472 B	0.78
Dolly	140.85 ns	2.835 ns	7.165 ns	139.39 ns	1.00	0.07	0.0119	608 B	1.00
DeepCloner	501.48 ns	13.753 ns	37.879 ns	490.50 ns	3.57	0.32	0.0277	1392 B	2.29
CloneExtensions	694.84 ns	11.787 ns	11.576 ns	694.27 ns	4.94	0.25	0.0296	1504 B	2.47
NClone	4,970.65 ns	91.412 ns	245.572 ns	4,948.11 ns	35.37	2.41	0.1678	8584 B	14.12
FastDeepCloner	17,968.60 ns	356.017 ns	462.923 ns	17,988.80 ns	127.88	6.86	0.1221	6944 B	11.42
AnyClone	22,256.06 ns	443.712 ns	1,001.532 ns	22,134.10 ns	158.39	10.31	0.7935	41256 B	67.86