/// <summary>
/// Initializes a new instance of ImmediateNotificationRegister class.
/// </summary>
/// <param name="context">an instance of DbContext is used to get an ObjectQuery object</param>
/// <param name="query">an instance of IQueryable is used to get ObjectQuery object, and then get
/// connection string and command string to register SqlDependency nitification. </param>
public ImmediateNotificationRegister(DbContext context, IQueryable query)
{
try
{
this.iquery = query;
// Get the ObjectQuery directly or convert the DbQuery to ObjectQuery.
oquery = QueryExtension.GetObjectQuery <TEntity>(context, iquery);
QueryExtension.GetSqlCommand(oquery, ref connection, ref command);
RegisterSqlDependency();
}
catch (ArgumentException ex)
{
if (ex.ParamName == "context")
{
throw new ArgumentException("Paramter cannot be null", "context", ex);
}
else
{
throw new ArgumentException("Paramter cannot be null", "query", ex);
}
}
catch (Exception ex)
{
throw new Exception(
"Fails to initialize a new instance of ImmediateNotificationRegister class.", ex);
}
}
