I'm trying to pass a sqlDataReader from a called function to a calling
function but got nothing back and a message saying "An unhandled
exception of type 'System.NullReferenceException' occurred in
Throw.exe. Object reference not set to an instance of an object."
Here is my code:
Public Function testint() As String
'Nothing returns here, plus the error above
Dim xp As SqlDataReader = getStoreProcedures("StoreProcedure")
End Function
Public Function getStoreProcedures() As SqlDataReader
Dim sp As SqlDataReader =
CCMSDB.DBDataReader("procSelectBatchReports")
'This sp.Read returns rows displayed in the message box fine.
While sp.Read
MsgBox(sp("StoreProcedure"))
End While
'This code works fine until here
getStoreProcedures = sp
'After this, when it returns to Testint, it will blow up
end function
Can anyone help please? I'm new to VB.NET. Thanks in advance,
James 6 9009
Hi James,
There doesn't seem to be anything wrong with the code that you have shown,
except that it isn't the code that you are using!!
One getStoreProcedures takes a parameter.
Dim xp As SqlDataReader = getStoreProcedures("StoreProcedure")
The other doesn't
Public Function getStoreProcedures() As SqlDataReader
This isn't the cause of the Exception, but it may be the cause of me not
being able to see what is!!
Regards,
Fergus
try
Return sp
instead of getstoreproceduces=sp
"James P." <jp***@sandsexpo.com> wrote in message
news:bd**************************@posting.google.c om... I'm trying to pass a sqlDataReader from a called function to a calling function but got nothing back and a message saying "An unhandled exception of type 'System.NullReferenceException' occurred in Throw.exe. Object reference not set to an instance of an object."
Here is my code: Public Function testint() As String 'Nothing returns here, plus the error above Dim xp As SqlDataReader = getStoreProcedures("StoreProcedure") End Function Public Function getStoreProcedures() As SqlDataReader Dim sp As SqlDataReader = CCMSDB.DBDataReader("procSelectBatchReports") 'This sp.Read returns rows displayed in the message box fine. While sp.Read MsgBox(sp("StoreProcedure")) End While 'This code works fine until here getStoreProcedures = sp 'After this, when it returns to Testint, it will blow up end function
Can anyone help please? I'm new to VB.NET. Thanks in advance, James
Hi Mat,
For backwards compatibility (I believe), assignment to the Function name
is a legitimate way to return a value
Function Foo As String
Foo = "I'm going places!!"
End Function
Regards,
Fergus
"Fergus Cooney" <fi******@tesco.net> wrote in message news:<uD**************@TK2MSFTNGP10.phx.gbl>... Hi James,
There doesn't seem to be anything wrong with the code that you have shown, except that it isn't the code that you are using!!
One getStoreProcedures takes a parameter. Dim xp As SqlDataReader = getStoreProcedures("StoreProcedure")
The other doesn't Public Function getStoreProcedures() As SqlDataReader
This isn't the cause of the Exception, but it may be the cause of me not being able to see what is!!
Regards, Fergus
Fergus,
Thanks a lot for pointing out my classic mistake. It works after I modified it.
James
Hi James,
Strange, I'd have expected the compiler to pick that one up.
No matter - you're back on the road again. :-)
Regards,
Fergus
Fergus,
Thanks a lot for pointing out the missing parameter in the function. It
works now.
James
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