问题
I am cleaning up the DataReaders in an old .NET 1.1 project that I inherited.
The previous developer coded the data-access-layer in such a way that most of the DAL methods returned SqlDataReaders (thus leaving it up to the caller to properly call the .Close() or .Dispose() methods).
I have come across a situation, though, where a caller is not catching the returned SqlDataReader (and therefore is not disposing of it properly). See the code below:
Data Access Method:
Public Shared Function UpdateData() As SqlDataReader
...
drSQL = cmdSQL.ExecuteReader(CommandBehavior.CloseConnection)
Return drSQL
End Function
Calling code:
...
DataAccessLayer.UpdateData()
...
As you can see, the calling method does not receive/catch the returned SqlDataReader. So what happens? Is that SqlDataReader still out there and open? Or does it automatically get garbage collected since nothing is addressing it?
I couldn't think of a way to debug and test this. If anybody has any ideas or suggestions that would be great.
回答1:
i believe that it will get closed but not until the garbage-collector gets 'round to it, which may not be for a very long time...
来源：https://stackoverflow.com/questions/247311/sqldatareader-in-this-scenario-will-the-reader-get-closed