Table of Contents

Domain Modeling

Master the domain modeling DSL for defining entities, value objects, and enums with properties, keys, and relationships.

Time: 45 minutes | Level: Beginner-Intermediate

What You'll Learn

  • Entity definitions with properties
  • Value object patterns
  • Enumeration types
  • Composite keys and indexes
  • Relationships and navigation properties

Topics Covered

Defining Entities

Learn how to use the fluent DSL to define entities:

Domain.Create("MyDomain")
    .Entity<Customer>(e => e
        .Property(c => c.Id)
        .Property(c => c.Name)
        .Property(c => c.Email))

Value Objects

Model value objects that represent domain concepts:

.ValueObject<Address>(v => v
    .Property(a => a.Street)
    .Property(a => a.City)
    .Property(a => a.ZipCode))

Enumerations

Define strongly-typed enumerations:

.Enum<OrderStatus>(e => e
    .Value("Pending", 0)
    .Value("Processing", 1)
    .Value("Completed", 2))

Configuration

Add EF Core configuration:

.ConfigureEntity<Customer>(config => config
    .HasKey(c => c.Id)
    .ToTable("Customers")
    .HasIndex(c => c.Email, idx => idx.IsUnique()))

Prerequisites

  • Basic C# knowledge
  • Understanding of domain modeling concepts
  • Completion of Quick Start

Sample Code

See samples/JD.Domain.Samples.CodeFirst/ for complete examples.

API Reference

Next Steps

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