BuilderGenerator by Mell Grubb
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Name: BuilderGenerator
Generates builder classes for testing and/or seed data.
Author: Mell Grubb
NuGet: https://www.nuget.org/packages/BuilderGenerator/
You can find more details at https://github.com/MelGrubb/BuilderGenerator
Original Readme
Builder Generator
This is a .Net Source Generator designed to add "Builders" to your projects. Builders are an object creation pattern, similar to the Object Mother pattern. Object Mothers and Builders are most commonly used to create objects for testing, but they can be used anywhere you want "canned" objects.
For more complete documentation, please see the documentation site or the raw documentation source.
Known Issues
This project has moved to the .Net 6 version of source generators, which unfortuntely means that it's incompatible with Visual Studio 2019. It's also breaking the GitHub build pipeline at the moment. It all seems to work just fine in VS2022 though. If you're stuck on .Net 5 and VS2019, you can always use the v1.x series, although its usage is different.
Installation
BuilderGenerator is installed as an analyzer via NuGet package (https://www.nuget.org/packages/BuilderGenerator/). You can find it through the "Manage NuGet Packages" dialog in Visual Studio, or from the command line.
Install-Package BuilderGenerator
Usage
After installation, create a partial class to define your builder in. Decorate it with the BuilderFor attribute, specifying the type of class that the builder is meant to build (e.g. [BuilderFor(typeof(Foo))]. Define any factory and helper methods in this partial class. Meanwhile, another partial class definition will be auto-generated which contains all the "boring" parts such as the backing fields and "with" methods.
Version History
v2.3.0
- Major caching and performance improvements
- Internal code cleanup
- Conversion of templates to embedded resources
v2.2.0
- Changed generated file extension to .g.cs
v2.0.7
- Fixed #13, NetStandard2.0 compatibility
v2.0.6
- Fixed #12, Generated files now marked with auth-generated header
v2.0.5
- Fixed #14, duplicate properties
v2.0.3
- Attempting to fix NuGet packaging problems
v2.0.2
- Setters for base class properties rendering properly
v2.0.1
- Improved error handling
v2.0.0
- Updated to .Net 6 and IIncrementalGenerator (See note above about incompatibility with VS2019)
- Changed usage pattern from marking target classes with attributes to marking partial builder classes
v1.2
- Solution reorganization
- Version number synchronization
- Automated build pipeline
v1.0
- First major release
v0.5
- Public beta
- Working NuGet package
- Customizable templates
Roadmap
- Read-only collection support in default templates
- Attribute-less generation of partial classes
- Completed documentation
- Unit tests for generation components
Attributions
The BuilderGenerator logo includes tools by John Caserta from the Noun Project.
About
Generating Builder class for an object
How to use
Example ( source csproj, source files )
- CSharp Project
- Program.cs
- Person.cs
- PersonBuilder.cs
This is the CSharp Project that references BuilderGenerator
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net7.0</TargetFramework>
</PropertyGroup>
<PropertyGroup>
<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>
<CompilerGeneratedFilesOutputPath>$(BaseIntermediateOutputPath)\GX</CompilerGeneratedFilesOutputPath>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="BuilderGenerator" Version="2.3.0" />
</ItemGroup>
</Project>
This is the use of BuilderGenerator in Program.cs
using Builder;
var pOld = new Person();
pOld.FirstName = "Andrei";
pOld.LastName = "Ignat";
pOld.MiddleName = "G";
var build = new PersonBuilder()
.WithFirstName(pOld.FirstName)
.WithMiddleName("")
.WithLastName(pOld.LastName)
;
var pNew = build.Build();
System.Console.WriteLine(pNew.FullName());
System.Console.WriteLine(pOld.FullName());
This is the use of BuilderGenerator in Person.cs
namespace Builder;
public class Person
{
public string FirstName { get; set; }
public string? MiddleName { get; set; }
public string LastName { get; set; }
public string FullName()
{
return FirstName + " " + MiddleName + " "+LastName;
}
}
This is the use of BuilderGenerator in PersonBuilder.cs
namespace Builder;
[BuilderGenerator.BuilderFor(typeof(Person))]
public partial class PersonBuilder
{
}
Generated Files
Those are taken from $(BaseIntermediateOutputPath)\GX
- BuilderBaseClass.cs
- BuilderForAttribute.cs
- PersonBuilder.g.cs
#nullable disable
namespace BuilderGenerator
{
/// <summary>Base class for object builder classes.</summary>
/// <typeparam name="T">The type of the objects built by this builder.</typeparam>
public abstract class Builder<T> where T : class
{
/// <summary>Gets or sets the object returned by this builder.</summary>
/// <value>The constructed object.</value>
#pragma warning disable CA1720 // Identifier contains type name
protected System.Lazy<T> Object { get; set; }
#pragma warning restore CA1720 // Identifier contains type name
/// <summary>Builds the object instance.</summary>
/// <returns>The constructed object.</returns>
public abstract T Build();
protected virtual void PostProcess(T value)
{
}
/// <summary>Sets the object to be returned by this instance.</summary>
/// <param name="value">The object to be returned.</param>
/// <returns>A reference to this builder instance.</returns>
public Builder<T> WithObject(T value)
{
Object = new System.Lazy<T>(() => value);
return this;
}
}
}
namespace BuilderGenerator
{
[System.AttributeUsage(System.AttributeTargets.Class)]
public class BuilderForAttribute : System.Attribute
{
public bool IncludeInternals { get; }
public System.Type Type { get; }
public BuilderForAttribute(System.Type type, bool includeInternals = false)
{
IncludeInternals = includeInternals;
Type = type;
}
}
}
#nullable disable
//------------------------------------------------------------------------------
// <auto-generated>
// This code was generated by BuilderGenerator at 2024-02-04T20:27:28 in 33.1967ms.
// </auto-generated>
//------------------------------------------------------------------------------
using System.CodeDom.Compiler;
namespace Builder
{
public partial class PersonBuilder : BuilderGenerator.Builder<Builder.Person>
{
public System.Lazy<string> FirstName = new System.Lazy<string>(() => default(string));
public System.Lazy<string> LastName = new System.Lazy<string>(() => default(string));
public System.Lazy<string?> MiddleName = new System.Lazy<string?>(() => default(string?));
public override Builder.Person Build()
{
if (Object?.IsValueCreated != true)
{
Object = new System.Lazy<Builder.Person>(() =>
{
var result = new Builder.Person
{
FirstName = FirstName.Value,
LastName = LastName.Value,
MiddleName = MiddleName.Value,
};
return result;
});
PostProcess(Object.Value);
}
return Object.Value;
}
public PersonBuilder WithFirstName(string value)
{
return WithFirstName(() => value);
}
public PersonBuilder WithFirstName(System.Func<string> func)
{
FirstName = new System.Lazy<string>(func);
return this;
}
public PersonBuilder WithoutFirstName()
{
FirstName = new System.Lazy<string>(() => default(string));
return this;
}
public PersonBuilder WithLastName(string value)
{
return WithLastName(() => value);
}
public PersonBuilder WithLastName(System.Func<string> func)
{
LastName = new System.Lazy<string>(func);
return this;
}
public PersonBuilder WithoutLastName()
{
LastName = new System.Lazy<string>(() => default(string));
return this;
}
public PersonBuilder WithMiddleName(string? value)
{
return WithMiddleName(() => value);
}
public PersonBuilder WithMiddleName(System.Func<string?> func)
{
MiddleName = new System.Lazy<string?>(func);
return this;
}
public PersonBuilder WithoutMiddleName()
{
MiddleName = new System.Lazy<string?>(() => default(string?));
return this;
}
}
}
Usefull
Download Example (.NET C# )
Share BuilderGenerator
https://ignatandrei.github.io/RSCG_Examples/v2/docs/BuilderGenerator