VB .NET -> C# conversion problem

[Mika M]

Hi!

I try to convert some VB.NET 2003 code into C# 2003 code. Code uses
Sax.Communications COM-port control, and VB code is working fine.

Here is part of VB Class code I'm trying to convert...

Imports Sax.Communications '// Importing component Namespace

Private WithEvents _ComPort As SerialConnection '// Declaration Com-port
as Class Variable

_ComPort = New SerialConnection '// Creating instance, setup Com settings
_ComPort.Open() '// and open port for use

Private Sub _ComPort_DataAvailable(ByVal sender As System.Object, ByVal
e As System.EventArgs) Handles _ComPort.DataAvailable '// Event Handling
if data will be available
....
'// This sub saves available data into "ComBufferString"-property,
'// and it Raises there Event like
'// RaiseEvent ComBufferChanged(Me, New EventArgs)
....
End Sub

....and as C# code something like...

using Sax.Communications;

private SerialConnection _ComPort; // <- How to convert this like VB.NET
"WithEvents" ???

_ComPort = new SerialConnection();
_ComPort.Open();

private void _ComPort_DataAvailable(System.Object sender,
System.EventArgs e)
{
....
// This sub saves available data into "ComBufferString"-property,
// and it Raises there Event like
//if (ComBufferChanged != null) ComBufferChanged(this, new EventArgs());
....
}

My problem is: private void _ComPort_DataAvailable is never fired when
Com port has received data from device attached into COM-port :(

Propably VB code line...

Private WithEvents _ComPort As SerialConnection

.... is not correctly converted into C# as ...

private SerialConnection _ComPort;

or am I missing something?

--
Thanks in advance!

Mika

[Mark R. Dawson]

Hi Mike M,
in C# there is no need for a withevents keyword. Instead of using the
handles keyword you will need to assign a handler function using the +=
syntax.

In your example _ComPort instance will have an event called DataAvailable,
in the load event or constructor you need to assign the function that will
handle this event using some code like:
_ComPort.DataAvailable += new
DataAvailableEventHandler(_ComPort_DataAvailable);

I am not sure what your delegate is called (i.e. the thing I called
DataAvailableEventHandler in my example above) you will have to look at the
documentation or if you are using and IDE it will probably fill it in for
your.

Hope that helps
Mark R Dawson
http://www.markdawson.org

"Mika M" wrote:

Hi!

I try to convert some VB.NET 2003 code into C# 2003 code. Code uses
Sax.Communications COM-port control, and VB code is working fine.

Here is part of VB Class code I'm trying to convert...

Imports Sax.Communications '// Importing component Namespace

Private WithEvents _ComPort As SerialConnection '// Declaration Com-port
as Class Variable

_ComPort = New SerialConnection '// Creating instance, setup Com settings
_ComPort.Open() '// and open port for use

Private Sub _ComPort_DataAvailable(ByVal sender As System.Object, ByVal
e As System.EventArgs) Handles _ComPort.DataAvailable '// Event Handling
if data will be available
....
'// This sub saves available data into "ComBufferString"-property,
'// and it Raises there Event like
'// RaiseEvent ComBufferChanged(Me, New EventArgs)
....
End Sub

....and as C# code something like...

using Sax.Communications;

private SerialConnection _ComPort; // <- How to convert this like VB.NET
"WithEvents" ???

_ComPort = new SerialConnection();
_ComPort.Open();

private void _ComPort_DataAvailable(System.Object sender,
System.EventArgs e)
{
....
// This sub saves available data into "ComBufferString"-property,
// and it Raises there Event like
//if (ComBufferChanged != null) ComBufferChanged(this, new EventArgs());
....
}

My problem is: private void _ComPort_DataAvailable is never fired when
Com port has received data from device attached into COM-port :(

Propably VB code line...

Private WithEvents _ComPort As SerialConnection

.... is not correctly converted into C# as ...

private SerialConnection _ComPort;

or am I missing something?

--
Thanks in advance!

Mika

[Mika M]

Well... I tried to add line...

_ComPort.DataAvailable += new
DataAvailableEventHandler(_ComPort_DataAvailable);

....into my class constructor, but got error...

"The type or namespace name 'DataAvailableEventHandler' could not be
found (are you missing a using directive or an assembly reference?)"

Then I tried to change it to...

_ComPort.DataAvailable += new EventHandler(_ComPort_DataAvailable);

....but it caused error too...

"Cannot implicitly convert type 'System.EventHandler' to
'Sax.Communications.SerialConnection.DataAvailable EventHandler'"

Maybe I'm missing something, or placed the line into wrong place. I'm
quite newbie with C#, used mostly VB.NET about since summer 2003.

I don't understand much about delegates, mostly coded them "try with
luck" method :)

Any suggestions?

Mark R. Dawson wrote:

Hi Mike M,
in C# there is no need for a withevents keyword. Instead of using the
handles keyword you will need to assign a handler function using the +=
syntax.

In your example _ComPort instance will have an event called DataAvailable,
in the load event or constructor you need to assign the function that will
handle this event using some code like:
_ComPort.DataAvailable += new
DataAvailableEventHandler(_ComPort_DataAvailable);

I am not sure what your delegate is called (i.e. the thing I called
DataAvailableEventHandler in my example above) you will have to look at the
documentation or if you are using and IDE it will probably fill it in for
your.

Hope that helps
Mark R Dawson
http://www.markdawson.org

"Mika M" wrote:

Hi!

I try to convert some VB.NET 2003 code into C# 2003 code. Code uses
Sax.Communications COM-port control, and VB code is working fine.

Here is part of VB Class code I'm trying to convert...

Imports Sax.Communications '// Importing component Namespace

Private WithEvents _ComPort As SerialConnection '// Declaration Com-port
as Class Variable

_ComPort = New SerialConnection '// Creating instance, setup Com settings
_ComPort.Open() '// and open port for use

Private Sub _ComPort_DataAvailable(ByVal sender As System.Object, ByVal
e As System.EventArgs) Handles _ComPort.DataAvailable '// Event Handling
if data will be available
....
'// This sub saves available data into "ComBufferString"-property,
'// and it Raises there Event like
'// RaiseEvent ComBufferChanged(Me, New EventArgs)
....
End Sub

....and as C# code something like...

using Sax.Communications;

private SerialConnection _ComPort; // <- How to convert this like VB.NET
"WithEvents" ???

_ComPort = new SerialConnection();
_ComPort.Open();

private void _ComPort_DataAvailable(System.Object sender,
System.EventArgs e)
{
....
// This sub saves available data into "ComBufferString"-property,
// and it Raises there Event like
//if (ComBufferChanged != null) ComBufferChanged(this, new EventArgs());
....
}

My problem is: private void _ComPort_DataAvailable is never fired when
Com port has received data from device attached into COM-port :(

Propably VB code line...

Private WithEvents _ComPort As SerialConnection

.... is not correctly converted into C# as ...

private SerialConnection _ComPort;

or am I missing something?

--
Thanks in advance!

Mika

[ssg31415926]

You've only got a using statement for the namespace Sax.Communications
but you're trying to use DataAvailableEventHandler from the namespace
Sax.Communications.SerialConn*ection.
Try:
_ComPort.DataAvailable += new
Sax.Communications.SerialConn*ection.DataAvailable EventHandler(_Com*Port_DataAvailable);
or just:
_ComPort.DataAvailable += new
SerialConn*ection.DataAvailableEventHandler(_Com*P ort_DataAvailable);