DDD Example

example.cs

public class HouseId : IEquatable<HouseId>
{
    private readonly string id;
    public HouseId(string id)
    {
        this.id = id;
    }

    public bool Equals(HouseId other)
    {
        return this.id == other.id;
    }
}

public class TenantId : IEquatable<TenantId>
{
    private readonly string id;
    public TenantId(string id)
    {
        this.id = id;
    }

    public bool Equals(TenantId other)
    {
        return this.id == other.id;
    }
}

public class IssueId : IEquatable<IssueId>
{
    private readonly string id;
    public IssueId(string id)
    {
        this.id = id;
    }

    public bool Equals(IssueId other)
    {
        return this.id == other.id;
    }
}

public class Name : IEquatable<Name>
{
    public string FirstName { get; }

    public string LastName { get; }


    public Name(string firstName, string lastName)
    {
        this.FirstName = firstName;
        this.LastName = lastName;
    }

    public bool Equals(Name other)
    {
        return this.FirstName == other.FirstName &&
            this.LastName == other.LastName;
    }
}

public class Tenant
{
    public TenantId Id { get; }

    public Name Name { get; }

    public Tenant(TenantId tenantId, Name name)
    {
        this.Id = tenantId;
        this.Name = name;
    }
}

public class House
{
    public HouseId Id { get; }

    public TenantId CurrentTenantId { get; private set; }

    public House(HouseId houseId)
    {
        this.Id = houseId;
    }

    public void TenantMovedIn(Tenant tenant)
    {
        this.CurrentTenantId = tenant.Id;
    }

    public Issue CreateIssue(IssueId issueId, string remarks)
    {
        return new Issue(issueId, this.Id, this.CurrentTenantId, remarks);
    }
}

public class Issue
{
    public IssueId Id { get; }

    public HouseId HouseId { get; }

    public TenantId TenatId { get; }

    public string Remarks { get; }

    internal Issue(IssueId issueId, HouseId houseId, TenantId tenatId, string remarks)
    {
        this.Id = issueId;
        this.HouseId = houseId;
        this.TenatId = tenatId;
        this.Remarks = remarks;
    }
}