Error in Linq Query

[dqrest]

Hi!
I have Devart.Data.Linq 4.4.697.0, Devart.Data.Oracle.Linq 4.4.697.0, Devart.Data.Oracle. 8.4.359.0 and use MS VS 2013 Ultimate, C#. Last week I upgraded versions of Devart.Data.Oracle from 6.50.228.0 to 8.4.359.0, Devart.Data.Linq from 3.0.5.0 to 4.4.697.0 and Devart.Data.Oracle.Linq from 3.0.5.0 to 4.4.697.0.

I faced to problems by executing a Linq queries in my WebSite which appeared in the following code:

Code: Select all

var data = (from c in All.SysFilterCriterions
            select
                new  MyCriterion()
                {
                    No = c.No,
                    FieldNo = c.FieldNo,
                    Caption = c.Caption,
                    IsLocalField = c.FieldNo == c.E_FilterNo.BlockNo || c.E_FieldNo_51.BlockNo == c.E_FilterNo.BlockNo
                })
            .ToList();

Class "MyCriterion" is declared in class "Core_Pages_FlatHandbookFilter" which is a WebPage and is derivated from Page.

Code: Select all

public partial class Core_Pages_FlatHandbookFilter : Page
{
   ..........
   public void func()
   {
        // here is linq query code
   }
    public class MyCriterion
    {
	public long No;
        public long? FieldNo;
        public string Caption;
        public bool IsLocalField;
    }
}

And when I launch website I have the following error:

'Devart.Data.Linq.Engine.ObjectReader`1[TN.Core.MainModule+MyCriterion]' cannot be converted to type 'System.Collections.Generic.IEnumerator`1[Core_Pages_FlatHandbookFilter+MyCriterion]'."

Note when I add the class "Criterion" to the class "TN.Core.MainModule" and use the class "Criterion" instead of the class "MyCriterion" in the mentioned linq query, the error is disappeared.
I'd like to say that I elimated all namepsaces System.Data.Linq.Mapping and System.Data.Linq from my WebSite. At last, I represent the class "TN.Core.MainModule"

Code: Select all

namespace TN.Core
{
	public class MainModule : IHttpModule
	{
             public void Dispose() 
            { 
                   // .....
            }
            public void Init(HttpApplication context)
	    {   
                  // ....
            }
            

            public class Criterion
            {
                public long No;
                public long? FieldNo;
                public string Caption;
                public bool IsLocalField;
            }
        }
}

What happaneds?

[MariiaI]

We couldn't reproduce this error in our environment with the latest build of LinqConnect 4.5.835. Please create and send us a test project, with which this issue is reproducible. This will significantly speed up the process of determining the cause of the error and finding the solution for you.

[dqrest]

Hello!

I send my simple project to [email protected] where you can catch the following error:

"Devart.Data.Linq.Engine.ObjectReader`1[TN.Core.MainModule+MyCriterion]' cannot be converted to type 'System.Collections.Generic.IEnumerator`1[Core_Pages_FlatHandbookFilter+MyCriterion]'"!

Please, find out the desicion of this problem.

Thanks!

[MariiaI]

We have contacted you by e-mail.