Getting error while using LINQ

[Gabriel]

Hi
I have a TestClass which defines as follows:

[Telerik.OpenAccess.Persistent(IdentityField = "_id")]
    public class TestClass
    {
        private int _id;
        private int _parentID;
        private string _nameValue;

        public int ID
        {
            get
            {
                return _id;
            }
            set
            {
                _id = value;
            }
        }

        public int ParentID
        {
            get
            {
                return _parentID;
            }
            set
            {
                _parentID = value;
            }
        }

        public string NameValue
        {
            get
            {
                return _nameValue;
            }
            set
            {
                _nameValue = value;
            }
        }
    }

I wanted to fetch some records from database using LINQ so i used the following code:

IObjectScope scope = ObjectScopeProvider1.ObjectScope();

var result = from c in scope.Extent<TestClass>()
             where c.NameValue.Matches("Test")
             select c;
objectView1.DataSource = result.ToList();

but i get this run-time error for the last line of code:
An exception occured during the execution of '
Extent<WindowsFormsApplication2.TestClass>.Where(c => c.NameValue.Matches("Test"))'. See InnerException for more details.

The strange thing is that when i omit the "where c.NameValue.Matches("Test")" line, everything works fine.

Can anybody tell me what's the problem?

[Damyan Bogoev]

Hi Gabriel,

You should set the FieldAlias attribute for the NameValue property to be able to use this property in a query:

[Telerik.OpenAccess.Persistent(IdentityField = "_id")]
public class TestClass
{
    private int _id;
    private int _parentID;
    private string _nameValue;

    public int ID
    {
        get
        {
            return _id;
        }
        set
        {
            _id = value;
        }
    }

    public int ParentID
    {
        get
        {
            return _parentID;
        }
        set
        {
            _parentID = value;
        }
    }

    [Telerik.OpenAccess.FieldAlias("_nameValue")]
    public string NameValue
    {
        get
        {
            return _nameValue;
        }
        set
        {
            _nameValue = value;
        }
    }
}

Hope that helps.

Kind regards,
Damyan Bogoev
the Telerik team