AutoMapper is a powerful library in C# projects that simplifies object mapping operations, making them fast and straightforward. In this article, we will cover a broad range of topics, starting from the basic usage of AutoMapper to in-depth discussions on nested mapping, reverse mapping, conditional mapping, and the usage of profiles.

Table of Contents:

1. What is AutoMapper?
   • Understanding the fundamental principles of AutoMapper and why it is essential.
2. Installing AutoMapper
   • Step-by-step guide on adding AutoMapper to your project using NuGet package manager.
3. Basic Usage
   • Simple mapping operations between two classes with practical usage examples.

var configuration = new MapperConfiguration(cfg => cfg.CreateMap<SourceClass, TargetClass>());

var mapper = new Mapper(configuration);

var sourceObj = new SourceClass { Prop1 = "Value1", Prop2 = "Value2" };
var targetObj = mapper.Map<TargetClass>(sourceObj);

4. Nested Mapping

• Successfully mapping nested objects with clear examples.

var configuration = new MapperConfiguration(cfg => 
{
    cfg.CreateMap<SourceClass, TargetClass>();
    cfg.CreateMap<SourceNestedClass, TargetNestedClass>();
});

5. Reverse Mapping

• Techniques and examples for mapping objects in both directions.

var configuration = new MapperConfiguration(cfg => cfg.CreateMap<SourceClass, TargetClass>().ReverseMap());

6. Conditional Mapping

• Mapping based on specific conditions with practical code snippets.

var configuration = new MapperConfiguration(cfg => 
{
    cfg.CreateMap<SourceClass, TargetClass>()
        .ForMember(dest => dest.TargetProp, opt => opt.Condition(src => src.SourceProp != null));
});

7. AutoMapper Profiles

• Organizing mapping operations using profiles and handling more complex scenarios.

public class ProjectProfile : Profile
{
    public ProjectProfile()
    {
        CreateMap<SourceClass, TargetClass>();
        // Other mappings...
    }
}

8. Performance Improvements

• Configuring AutoMapper for enhanced performance, especially when dealing with large datasets.

var configuration = new MapperConfiguration(cfg => 
{
    cfg.AddProfile<ProjectProfile>();
    cfg.AllowNullCollections = true;
    cfg.ValidateInlineMaps = false;
});

Each topic is accompanied by concise and illustrative code examples, aimed at assisting C# developers in effectively utilizing AutoMapper. Enjoy reading!