RSGC-Builder Design Pattern – part 8

 

 

name data-builder-generator
nuget

https://www.nuget.org/packages/DasMulli.DataBuilderGenerator/

link https://github.com/dasMulli/data-builder-generator
author Martin Andreas Ulrich

Implements the Builder Design pattern for any class. Useful , at least, for test projects
 

The code that you start with is

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[GenerateDataBuilder]                              
 
public class Person
 
{
 
     public string FirstName { get; set; }
 
     public string? MiddleNames { get; set; }
 
     public string LastName { get; set; }
 
      
 
}

The code that you will use is

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var pOld = new Person();                                                                             
 
pOld.FirstName = "Andrei";
 
pOld.LastName = "Ignat";
 
pOld.MiddleNames = "G";
 
var build = new PersonBuilder(pOld).WithoutMiddleNames().WithFirstName("Florin");
 
var pNew = build.Build();
 
Console.WriteLine(pNew.FirstName);

 

The code that is generated is

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public partial class PersonBuilder                                        
 
     {
 
          private string? _firstName;
 
          private string? _middleNames;
 
          private string? _lastName;
 
          public PersonBuilder()
 
          {
 
          }
 
 
 
          public PersonBuilder(PersonBuilder otherBuilder)
 
          {
 
               _firstName = otherBuilder._firstName;
 
               _middleNames = otherBuilder._middleNames;
 
               _lastName = otherBuilder._lastName;
 
          }
 
 
 
          public PersonBuilder(Person existingInstance)
 
          {
 
               _firstName = existingInstance.FirstName;
 
               _middleNames = existingInstance.MiddleNames;
 
               _lastName = existingInstance.LastName;
 
          }
 
 
 
          public PersonBuilder WithFirstName(string firstName)
 
          {
 
               var mutatedBuilder = new PersonBuilder(this);
 
               mutatedBuilder._firstName = firstName;
 
               return mutatedBuilder;
 
          }
 
 
 
          public PersonBuilder WithMiddleNames(string? middleNames)
 
          {
 
               var mutatedBuilder = new PersonBuilder(this);
 
               mutatedBuilder._middleNames = middleNames;
 
               return mutatedBuilder;
 
          }
 
 
 
          public PersonBuilder WithoutMiddleNames()
 
          {
 
               var mutatedBuilder = new PersonBuilder(this);
 
               mutatedBuilder._middleNames = null;
 
               return mutatedBuilder;
 
          }
 
 
 
          public PersonBuilder WithLastName(string lastName)
 
          {
 
               var mutatedBuilder = new PersonBuilder(this);
 
               mutatedBuilder._lastName = lastName;
 
               return mutatedBuilder;
 
          }
 
 
 
          public Person Build()
 
          {
 
               var instance = new Person();
 
               if (!(_firstName is null))
 
                    instance.FirstName = _firstName;
 
               if (!(_middleNames is null))
 
                    instance.MiddleNames = _middleNames;
 
               if (!(_lastName is null))
 
                    instance.LastName = _lastName;
 
               return instance;
 
          }
 
     }

Example Code: https://github.com/ignatandrei/RSCG_Examples/tree/main/DP_Builder

All RSCG

Roslyn Source Code Generators