Error using Average function over System.Int64 field

[Michael]

Here, Age is System.Int64 (long) field. When using Average function over it: 

var query =
 from contact in context.Contacts
 group contact by contact.Name
 into g
 select new { Name = g.Key, AvgAge = g.Average(e => e.Age) };

The following exception occurs:

System.InvalidCastException: Type cast exception: double required, found System.Int64 ---> System.InvalidCastException: Specified cast is not valid.
 at System.Data.SqlClient.SqlBuffer.get_Double()
 at System.Data.SqlClient.SqlDataReader.GetDouble(Int32 i)
 at OpenAccessRuntime.Data.DoubleConverter.Read(DataHolder& data)
 --- End of inner exception stack trace ---
 at OpenAccessRuntime.Data.DoubleConverter.Read(DataHolder& data)
 at OpenAccessRuntime.Relational.fetch.FopGetProjection.fetch(FetchResult fetchResult, StateContainer stateContainer)
 at OpenAccessRuntime.Relational.fetch.FetchSpec.createRow(FetchResult fetchResult, StateContainer stateContainer)
Processing 1: [0] System.InvalidCastException: Type cast exception: double required, found System.Int64 ---> System.InvalidCastException: Specified cast is not valid.
 at System.Data.SqlClient.SqlBuffer.get_Double()
 at System.Data.SqlClient.SqlDataReader.GetDouble(Int32 i)
 at OpenAccessRuntime.Data.DoubleConverter.Read(DataHolder& data)
 --- End of inner exception stack trace ---
 at OpenAccessRuntime.Data.DoubleConverter.Read(DataHolder& data)
 at OpenAccessRuntime.Relational.fetch.FopGetProjection.fetch(FetchResult fetchResult, StateContainer stateContainer)
 at OpenAccessRuntime.Relational.fetch.FetchSpec.createRow(FetchResult fetchResult, StateContainer stateContainer)

[Viktor Zhivkov]

Hi Michael,

I am sorry for the inconvenience that you have experienced with this issue.
You are the first to report this bug in our DoubleConverter.
You can expect this issue to be fixed in our next public release of OpenAccess.
Unfortunately I cannot offer you any work around except using a different type for the Age property and database column. Based on the code in the DoubleConverter you should be fine if you use Int32, Decimal or Double.

In recognition of being the first to report new issue I have added a few Telerik points to your account.
I will notify you as soon as a build with the fix is available for download.

Regards,
Viktor Zhivkov
Telerik