RSCG – FastCloner

RSCG – FastCloner
 
 

Cloning objects

This is how you can use FastCloner .

The code that you start with is

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
	<PropertyGroup>
		<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
		<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
	</PropertyGroup>
	<ItemGroup>
	  <PackageReference Include="FastCloner" Version="3.4.4" />
	  <PackageReference Include="FastCloner.SourceGenerator" Version="1.1.4" />
	</ItemGroup>
	
</Project>

The code that you will use is

using CloneData;

Console.WriteLine("Hello, World!");
Person p = new ();
p.FirstName = "Andrei";
p.LastName = "Ignat";
p.Age = 54;
var p1=p.FastDeepClone();
Console.WriteLine(p1.Name());

using FastCloner.SourceGenerator.Shared;

namespace CloneData;
[FastClonerClonable]
public partial class Person
{
    public string FirstName { get; set; } = "";
    public string LastName { get; set; } = "";
    public int Age { get; set; }
    public string Name() => $"{FirstName} {LastName}";

    public Person[] Childs { get; set; } = [];
}

The code that is generated is

using System;

namespace Dolly
{
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
    public class ClonableAttribute : Attribute
    {
    }
}

using System;

namespace Dolly
{
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
    public class CloneIgnoreAttribute : Attribute
    {
    }
}

using System;
namespace Dolly
{
    public interface IClonable<T> : ICloneable
    {
        T DeepClone();
        T ShallowClone();
    }
}

using Dolly;
using System.Linq;
namespace CloneData;
partial class Person : IClonable<Person>
{
    object ICloneable.Clone() => this.DeepClone();
    public virtual Person DeepClone() =>
        new ()
        {
            FirstName = FirstName,
            LastName = LastName,
            Childs = Childs.Select(item => item.DeepClone()).ToArray()
        };

    public virtual Person ShallowClone() =>
        new ()
        {
            FirstName = FirstName,
            LastName = LastName,
            Childs = Childs.ToArray()
        };
}

//
// Generated: 2026-02-03 05:29:59 UTC
#nullable enable

using System;
using System.Collections.Generic;
using System.Reflection;
using FastCloner.SourceGenerator.Shared;
using FastCloner;

namespace CloneData
{
///

public static partial class PersonFastDeepCloneExtensions
{
///

/// The object to clone. [return: global::System.Diagnostics.CodeAnalysis.NotNullIfNotNull(“source”)]
public static global::CloneData.Person? FastDeepClone(this global::CloneData.Person? source)
{
return InternalFastDeepClone(source, null);
}

///

/// The object to clone. /// State for circular reference tracking. If null, a new state is created. internal static global::CloneData.Person? InternalFastDeepClone(this global::CloneData.Person? source, FcGeneratedCloneState? state)
{
if (source == null) return null;
var localState = state ?? new FcGeneratedCloneState();
var known = localState.GetKnownRef(source);
if (known != null) return (global::CloneData.Person)known;
var result = new global::CloneData.Person();
localState?.AddKnownRef(source, result);

result.FirstName = source.FirstName;
result.LastName = source.LastName;
result.Age = source.Age;
result.Childs = FastClonerSgCloneCloneData_Person__(source.Childs, localState);

return result;
}

private static global::CloneData.Person[]? FastClonerSgCloneCloneData_Person__(global::CloneData.Person[]? source, FcGeneratedCloneState? state)
{
if (source == null) return null;
if (state != null)
{
var known = state.GetKnownRef(source);
if (known != null) return (global::CloneData.Person[])known;
}

var result = new global::CloneData.Person[source.Length];
state?.AddKnownRef(source, result);

for (int i = 0; i < source.Length; i++) { result[i] = source[i]?.FastDeepClone(); } return result; } } } [/code] Code and pdf at
https://ignatandrei.github.io/RSCG_Examples/v2/docs/FastCloner