c# - How to create IsDirty inside OnPropertyChange, but at the same time turn it off when entities are loaded from a database -

i’m building wpf app, , got point want able check whether entity isdirty, found solution online:

private bool isdirty;      public virtual bool isdirty     {         { return isdirty; }         set { isdirty = value; }     }      public event propertychangedeventhandler propertychanged = delegate { };      protected void onpropertychanged([callermembername] string propertyname = "")     {         onpropertychanged(true, propertyname);     }      protected void onpropertychanged(bool makedirty, [callermembername] string propertyname = "")     {         propertychanged(this, new propertychangedeventargs(propertyname));          if (makedirty)         {             isdirty = makedirty;         }     } 

then can use

    [required(errormessage = errormessages.descriptionrequired)]     [stringlength(60, errormessage = errormessages.descriptionlength60)]     public string description     {         { return description; }         set         {             if (description != value)             {                 description = value;                 onpropertychanged();             }         }     } 

and seems work, anytime property changed entity dirty because onpropertychanged called. problem have when load entity (or collection of entities) database, onpropertychanged called:

someentitiescollection = new service().someentities(); 

then each entity comes marked dirty, , cannot find anyway around it, apart going through loop , setting isdirty false. there anyother way of achieving it?

regards

no, there isn't easy way

you should override method retrieve entities db in way sets automatically isdirty=false on entity creation. used nhibernate interceptor , events similar not case.

another way keep copy of original values , compute dirtiness when asks it. instead of using isdirty property should create method , save initial state properties