Monthly Archives: September 2010

C# .NET Immutable properties for Entity Framework, serializable classes, etc

An easy way to make properties immutable is to have private setters and pass the data as constructor parameter. Because entity framework needs a parameterless constructor, you need to provide oune, but you can make it private:

public class Immutable
   public string ImmutableProperty { get; private set;}
   // Parameterless constructor required for Entity framework serializer (and many other serializers too)
   private Immutable(){}
   public Immutable(string aData)
      ImmutableProperty = aData;

This is the easiest way to achive immutability using Entity Framework, and make posible to create Value-Objects (see Domain Driven Design by Eric Evans)