# IT:AD:Code First:Entities:Properties #



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### CheckList: Class Properties ###

* MUST: mark Scalar Properties as `virtual` to enable improved Change Tracking (by going from Snapshot CT to Proxy POCO Change Tracking, which is based on `IPOCO`/`IEntityWithChangeTracker`).
* MUST: mark Collection Navigation Properties as `virtual` to enable lazy loading.
* MUST: Navigation Collection properties must implement `ICollection<Entities>`
* SHOULD: As we are working with proxies, can use `private set` for Id, etc:
    * `public string Id {get; private set;}`
* CONSIDER: For properties that need to ignored:
    * DataAnnotations: `[Ignore]` (see [[IT/AD/Code First/DataAnnotations/]]).
    * FluentAPI: within `DataContext.OnModelCreating()`: `modelBuilder.Entity<Department>().Ignore(t => t.Budget);` (see [[IT/AD/Code First/FluentAPI/Properties/]])
* CONSIDER: For derived calculated properties *that need to be saved*, use empty sets:
    * `public FullName {get {return _first + " " + _last;} set {}}`  
* CONSIDER: If you have to turn of Id autogeneration:
    * DataAnnotations: ? (see [[IT/AD/Code First/DataAnnotations/]])
    * FluentAPI: within `DataContext.OnModelCreating()`: `modelBuilder.Entity<Dept>().Property(t => t.ID).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);` (see [[IT/AD/Code First/FluentAPI/Properties/]])