hi,I want to know How to set a default value to a Bo object's property,the type of property is a Bo class.

my Bo Objects as follow:

....

  User createdBy;

   public User CreatedBy

{

       Get{return createdBy;}

       Set{SetProperytValue("CreatedBy",ref createdBy,value);}

}

...

 

Comments:User is a class within XAF.

Try adding this to your class:

protected override void OnSaving()
        {
            // Set your default values here
            base.OnSaving();
        }

 

This is just one way to set default values, there are other ways depending on your needs (validation etc).

 

Mohsen

Hi Nie,

You can use AfterConstruction() to initialize some fields to a default value.
AfterConstruction() gets only called for a new object, it is not called for an object recreated from the DB.

public override void AfterConstruction() {
base.AfterConstruction();
CreatedBy = ...;
}

Regards,

 Thx,I want to ask another question that how to load data from database in a Bo class via code ?

 

 

My retrieve data code as bellow:

 

                 XPCollection xpCollection = new XPCollection(typeof(Contact));         
                CriteriaOperator criteria = CriteriaOperator.Parse("FirstName<>'nie'");
                xpCollection.Criteria = criteria;
                int ctr = xpCollection.Count;

 

 the var ctr  still get 0,in fact ,the Contact in DB have two records.

 

You need to use the right Session object in the constructor of the collection. By default, the Session,DefaultSession is used and it is targeted to the Access database located near your executable file.

  Dennis :Thank you ,I solved this problem