[SOLVED] Return a Null Entity as a property

Thanks, Jeff!

You're awesome!

Heather

Hi,

I am trying to return one entity out of an object's relational collection, but was getting an error if the collection was empty, so I added a check for an empty collection. If the collection is empty, I would like to return the NullEntity, but am having problems with the syntax to accomplish this.

The object model is thus: I have a Person entity, with a relation to "Involvements" (which indicate what roles a person has played in the organization).

This is my property code (Located in the Person Class):

/// <summary>     /// The latest Involvement (aka Staff, Board, Volunteer)     /// </summary>     public Involvement LatestInvolvement     {         //TODO: Finish Person.LatestInvolvement & Test (Need test data in DB)         get         {             ReadOnlyEntityList<Involvement> myList;             Involvement rInvolvement;             myList = this.Involvements;             myList.ApplySort("AuctionYear", System.ComponentModel.ListSortDirection.Descending, true); // Get the line items             if (myList.Count > 0)             { rInvolvement= myList[0]; }             else             { rInvolvement = NullEntity; }             return rInvolvement;         }     }

My problem occurs at the bolded line: "{ rInvolvement = NullEntity; }"

The Build error I get is:

Cannot implicitly convert type 'IdeaBlade.Persistence.Entity' to 'HS.Admin.Model.Involvement'. An explicit conversion exists (are you missing a cast?)   

I'm not sure what cast would be appropriate.

Thanks for any insights into how I can accomplish this.

Heather





Edited by HFloyd - 05-Sep-2008 at 12:18pm