SQL-CLR stored procedure doesn't return value

Question

I looked through Stackoverflow and found almost identical question here. It was asked a year ago and nobody answered it yet. Maybe I'll be more lucky than user1038334 and somebody will help me.

I have a SQL CLR stored procedure which works fine for days until something weird happens. My stored proc updates tables and returns a value as a result code. So by looking at this value I can decide if something went wrong. The problem is in receiving this result value. C# code throws an exception at a point of receiving a return value.

var returnValue = new SqlParameter {Direction = ParameterDirection.ReturnValue};
command.Parameters.Add(returnValue);

connection.Open();
command.ExecuteNonQuery();

return (int)returnValue.Value; //<-- here is an exception

And the funniest thing is that if I connect SQL Profiler, catch the query and then execute this query inside of SQL Server Management Studio I still can get a result value without any problems:

DECLARE @RC INT
EXECUTE @RC = MyClrStoreProc
SELECT @RC

Once I republish the CLR assembly or restart SQL Server everything gets fixed.

I'm pretty sure there should be a reason for such weird behaviour but I can't find.

• SQL Server version: Microsoft SQL Server Developer Edition (64-bit) - v.10.50.1765.0

• Host OS version: Microsoft Windows NT 6.1 (7601)

• .Net version: v4.0.30319

Any help would be greatly appreciated.

Answer 1

This is a SQL Server bug and Cumulative Update package 8 fixes the issue.