MappingValidator 1.0.2

MappingValidator

MappingValidator is a lightweight and powerful validation tool that detects missing fields in mappings between source and destination objects without relying on an external mapping library.

Dependency: .NET 9

✨ Features

• Works independently of mapping libraries (AutoMapper, Mapster, manual mapping, etc.)
• Detects fields that are not automatically or manually set in the target object
• Excludes specific fields with a customizable Ignore list
• Configurations are stored and reused by type pair (TSource, TDestination)

🚀 Installation

Reference the project as a DLL or add it via NuGet:

MappingValidator

🛠️ Usage

1. Example Model Definitions

public class Source
{
    public string Name { get; set; }
    public string Email { get; set; }
}

public class Destination
{
    public string Name { get; set; }
    public string Email { get; set; }
    public string Role { get; set; }
    public string CreatedBy { get; set; }
}

2. Configuration Class

@using MappingValidator

public static class MappingValidatorConfigurations
{
    public static void RegisterAll()
    {
        MapValidator.Configure<Source, Destination>(builder =>
        {
            builder.Ignore(dest => dest.CreatedBy);
        });
    }
}

3. Add Configuration to Program.cs

MappingValidator.Configure<Source, Destination>();

4. Application Usage

@using MappingValidator

try
{
    var source = new Source { Name = "Murat", Email = "murat@example.com" };
    var entity = Mapper.Map<Destination>(source);

    entity.Role = "Admin";
    //entity.CreatedBy = "murat.koc";

    MapValidator.Validate<Source, Destination>(entity);

    Console.WriteLine("All manual fields set successfully!");
}
catch (Exception ex)
{
    Console.WriteLine($"Error: {ex.Message}");
}

If the CreatedBy field is not set and is not added to the Ignore list:

** ValidationException:** Required fields not set on Destination: CreatedBy

🎯 When to Use?

• If there are fields that need to be filled in the target object after mapping
• If it is desired to detect missing assignments in mapping operations such as AutoMapper, Mapster, Mapperly
• If it is aimed to prevent missing data from going to the database

📄 License

MIT