Using interfaces instead of mapped classes

[ie]

Hey guys,

Here is my sample DB script:

CREATE TABLE Person
(
    Id          UNIQUEIDENTIFIER NOT NULL PRIMARY KEY,
    FirstName   NVARCHAR(50)     NOT NULL,
    LastName    NVARCHAR(50)     NOT NULL,
    BirthDate   DATETIME2(7)     NOT NULL,
    PhoneNumber NVARCHAR(20)     NULL,
)
GO
INSERT INTO Person VALUES (NEWID(), 'John', 'Johnson', '1980-01-01', '[phone]')
GO
INSERT INTO Person VALUES (NEWID(), 'Jack', 'Jackson', '1980-02-02', '[phone]')

GO
INSERT INTO Person VALUES (NEWID(), 'Bill', 'just Bill', '1980-04-04', '[phone]')
GO
INSERT INTO Person VALUES (NEWID(), 'No', 'Name', '1960-04-04', '[phone]')
GO

And here is my sample:

    public interface IPerson
    {
        string FirstName { get; set; }
        string LastName { get; set; }
        DateTime BirthDate { get; set; }
        string PhoneNumber { get; set; }
    }

    partial class Person : IPerson
    {
        public override string ToString()
        {
            return string.Format("Person {{ {0}, {1}, {2}, {3} }}", FirstName, LastName, PhoneNumber, BirthDate);
        }

        static void Main()
        {
//            foreach (var person in GetPeople<Person>().Where(x => x.BirthDate.Year > 1970))
//                Console.WriteLine(person);
            foreach (var person in GetPeople<IPerson>().Where(x => x.BirthDate.Year > 1970))
                Console.WriteLine(person);
        }

        static IQueryable<T> GetPeople<T>() where T : IPerson { return new TestEntityDiagrams().People as IQueryable<T>; }
    }

First of all, you guys rocks! It is absolutely cool that you generating name 'People' for person queryable collection.  

Now back to my problem. If I uncomment the commented foreach, everything will work as expected. But, if the code remains commented out, an exception will be produced:

Unhandled Exception: System.InvalidOperationException: An exception occured during the execution of 'Extent<Sample.Person>.Where(x => (x.BirthDate.Year > 1970))'. See InnerException for more details.

 ---> System.ArgumentOutOfRangeException: Parameter expression has unexpected type.

Parameter name: x

Actual value was Sample.IPerson.

   at Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQueryImpl(Typetype, Int32 elementAt, Object[] groupResolutionParamValues)

   at Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQuery(Type type, Int32 elementAt, Object[] groupResolutionParamValues)

   --- End of inner exception stack trace ---

   at Telerik.OpenAccess.Query.ExpressionCompiler.PerformDatabaseQuery(Type type, Int32 elementAt, Object[] groupResolutionParamValues)

   at Telerik.OpenAccess.Query.ExpressionExecution.PerformDatabaseQuery[T](Piece`1 piece, Object[] grpVals)

Please advice.

Thanks,

Ivan.

[Serge]

Hello Ivan,

Unfortunately as of now we do not support interfaces in our designer. This though is scheduled for the 2010 Q2 release. For the time being I suggest sticking to the generated classes.

We do appreciate your input and if you have any other concerns or suggestions please share them with us. 

Have a great day,
Serge
the Telerik team

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