select maximum value for a property is borken
---------------------------------------------

                 Key: DNET-429
                 URL: http://tracker.firebirdsql.org/browse/DNET-429
             Project: .NET Data provider
          Issue Type: Bug
          Components: Entity Framework support
    Affects Versions: 2.7.5
         Environment: VS 2010, EF 4.0, POCO Entity Generator 1.1
            Reporter: Jeldrik Hornschild
            Assignee: Jiri Cincura


If you have Table:

CREATE TABLE Some_Table
(
        ID              INTEGER NOT NULL PRIMARY KEY,
        Some_Value      VARCHAR(50) CHARACTER SET UTF8 NOT NULL
}


a mapped POCO class:

    public partial class SomeTable
    {
        #region Primitive Properties
    
        public virtual int ID
        {
            get;
            set;
        }
    
        public virtual string SomeValue
        {
            get;
            set;
        }
  }

The following statement produces an ArgumentNullException saying that "Value 
cannot be null. Parameter name: key":

using (var context = new MyContext()) 
{ 
    var maxID = context.SomeTable.Max(st => (int?)st.ID) ?? 0; 
} 

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