How to do "WithEvents " in C#?

[Brett]

What is the C# equivalent for this VB.NET code:
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

I get as far as:
private SHDocVw.Interne tExplorer IE_Inst = new SHDocVw.Interne tExplorer();

but am not sure how to translate the WithEvents part. Any suggestions?

Thanks,
Brett

[Markus Thurner]

> What is the C# equivalent for this VB.NET code: Private WithEvents

IE_Inst As New SHDocVw.Interne tExplorer

C# does not support WithEvents directly.
Have a look at differences between C# and VB.NET at
http://www.codeproject.com/dotnet/vb...difference.asp

To your question:
You have to define each event, where you want to use an event handler,
explicitly:

SHDocVw.Event1 += new EventHandler(Ha ndleEvent_Funct ion1);
SHDocVw.Event2 += new EventHandler(Ha ndleEvent_Funct ion2);
....
hth
thoean

[David Anton]

'WithEvents' is not required in C#. (It *shouldn't* be required in VB, but
that's a different story).

David Anton
www.tangiblesoftwaresolutions.com
Home of the Instant C# VB.NET to C# converter
and the Instant VB C# to VB.NET converter

"Markus Thurner" wrote:

What is the C# equivalent for this VB.NET code: Private WithEvents
IE_Inst As New SHDocVw.Interne tExplorer

C# does not support WithEvents directly.
Have a look at differences between C# and VB.NET at
http://www.codeproject.com/dotnet/vb...difference.asp

To your question:
You have to define each event, where you want to use an event handler,
explicitly:

SHDocVw.Event1 += new EventHandler(Ha ndleEvent_Funct ion1);
SHDocVw.Event2 += new EventHandler(Ha ndleEvent_Funct ion2);
....
hth
thoean

[Bob Powell [MVP]]

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB compilers
insistence on seeing the Readonly keyword even when it can see that there is
no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

you can remove events similarly with -= being the equivalent of
removehandler.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

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Subscribe to the RSS feeds provided and never miss a new article.

"Brett" <[e-mail]> wrote in message
news:u$******** *****@TK2MSFTNG P10.phx.gbl...

What is the C# equivalent for this VB.NET code:
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

I get as far as:
private SHDocVw.Interne tExplorer IE_Inst = new SHDocVw.Interne tExplorer();

but am not sure how to translate the WithEvents part. Any suggestions?

Thanks,
Brett

[Brett]

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB
compilers insistence on seeing the Readonly keyword even when it can see
that there is no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

Using my code, what is the .Paint part? Would that be InternetExplore r?

I'm not quite sure how to build the following in C#:
[VB.NET]
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

Maps to things such as:
Public Sub IEDocComplete(B yVal pDisp As Object, ByRef URL As Object) Handles
IE_Inst.Documen tComplete

Brett

[David Anton]

The usual general format of the C# add handler equivalent is:
<object>.<event > += new <eventhandler>( <event handling method>);

The equivalent C# code is (using our Instant C# VB to C# converter):

private SHDocVw.Interne tExplorer IE_Inst = new SHDocVw.Interne tExplorer();

//TODO: INSTANT C# TODO TASK: Insert the following converted event handlers
at the end of the 'InitializeComp onent' method for forms or into a
constructor for other classes:

IE_Inst.Documen tComplete += new System.EventHan dler(IEDocCompl ete);

public void IEDocComplete(o bject pDisp, ref object URL)
{
}

David Anton
www.tangiblesoftwaresolutions.com
Home of the Instant C# VB.NET to C# converter
and the Instant VB C# to VB.NET converter

"Brett" wrote:

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB
compilers insistence on seeing the Readonly keyword even when it can see
that there is no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

Using my code, what is the .Paint part? Would that be InternetExplore r?

I'm not quite sure how to build the following in C#:
[VB.NET]
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

Maps to things such as:
Public Sub IEDocComplete(B yVal pDisp As Object, ByRef URL As Object) Handles
IE_Inst.Documen tComplete

Brett

[Bob Powell [MVP]]

The .Paint part was just an example of a well-known event.

In your particular case you can declare the object and add the handler like so:

AxSHDocVw.AxWeb Browser axWebBrowser1 = new AxSHDocVw.AxWeb Browser();

this.axWebBrows er1.DocumentCom plete += new AxSHDocVw.DWebB rowserEvents2_D ocumentComplete EventHandler(th is.axWebBrowser 1_DocumentCompl ete);
--
Bob Powell [MVP]
Visual C#, System.Drawing

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Brett" <[e-mail]> wrote in message news:OQ******** ******@TK2MSFTN GP09.phx.gbl...

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB
compilers insistence on seeing the Readonly keyword even when it can see
that there is no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

Using my code, what is the .Paint part? Would that be InternetExplore r?

I'm not quite sure how to build the following in C#:
[VB.NET]
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

Maps to things such as:
Public Sub IEDocComplete(B yVal pDisp As Object, ByRef URL As Object) Handles
IE_Inst.Documen tComplete

Brett

[Brett]

Some of the online examples I've seen for events in C# make use of
delegates. No one in this thread has used delegates. Why not?

Here are a few examples that use delegates:
http://www.c-sharpcorner.com/Code/20...ingCSDD001.asp

http://www.codeproject.com/csharp/csevents01.asp

Brett
"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:ui******** ******@TK2MSFTN GP12.phx.gbl...
The .Paint part was just an example of a well-known event.

In your particular case you can declare the object and add the handler like
so:

AxSHDocVw.AxWeb Browser axWebBrowser1 = new AxSHDocVw.AxWeb Browser();
this.axWebBrows er1.DocumentCom plete += new
AxSHDocVw.DWebB rowserEvents2_D ocumentComplete EventHandler(th is.axWebBrowser 1_DocumentCompl ete);

--
Bob Powell [MVP]
Visual C#, System.Drawing

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Brett" <[e-mail]> wrote in message
news:OQ******** ******@TK2MSFTN GP09.phx.gbl...

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB
compilers insistence on seeing the Readonly keyword even when it can see
that there is no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

Using my code, what is the .Paint part? Would that be InternetExplore r?

I'm not quite sure how to build the following in C#:
[VB.NET]
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

Maps to things such as:
Public Sub IEDocComplete(B yVal pDisp As Object, ByRef URL As Object)
Handles
IE_Inst.Documen tComplete

Brett

[Brett]

I'm getting this error now on the line below:
C:\myFiles\mypr ogC#\Main\IE.cs (31): Method 'Mail.IE.IEDocC omplete(object,
ref object)' does not match delegate 'void System.EventHan dler(object,
System.EventArg s)'

[for this code]
IE_Inst.Documen tComplete += new System.EventHan dler(IEDocCompl ete);

[method defined here]
public void IEDocComplete(o bject pDisp, ref object url)
{

What exactly is it asking for?

Thanks,
Brett

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:ui******** ******@TK2MSFTN GP12.phx.gbl...
The .Paint part was just an example of a well-known event.

In your particular case you can declare the object and add the handler like
so:

AxSHDocVw.AxWeb Browser axWebBrowser1 = new AxSHDocVw.AxWeb Browser();
this.axWebBrows er1.DocumentCom plete += new
AxSHDocVw.DWebB rowserEvents2_D ocumentComplete EventHandler(th is.axWebBrowser 1_DocumentCompl ete);

--
Bob Powell [MVP]
Visual C#, System.Drawing

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Brett" <[e-mail]> wrote in message
news:OQ******** ******@TK2MSFTN GP09.phx.gbl...

"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%2******** ********@TK2MSF TNGP09.phx.gbl. ..

Don't worry about it. It's another example of keyword diarrhea in VB. It
fits right in with the idiocy of "overloads overrides" and the VB
compilers insistence on seeing the Readonly keyword even when it can see
that there is no set accessor.

If a class exposes public events then you can add a handler to them using
the += operator such as...

theForm.Paint+= new PaintEventHandl er(this painthandler); // This is the
equivalent of AddHandler

Using my code, what is the .Paint part? Would that be InternetExplore r?

I'm not quite sure how to build the following in C#:
[VB.NET]
Private WithEvents IE_Inst As New SHDocVw.Interne tExplorer

Maps to things such as:
Public Sub IEDocComplete(B yVal pDisp As Object, ByRef URL As Object)
Handles
IE_Inst.Documen tComplete

Brett

[Steve Walker]

In message <u5************ *@tk2msftngp13. phx.gbl>, Brett <[e-mail]>
writes

I'm getting this error now on the line below:
C:\myFiles\myp rogC#\Main\IE.c s(31): Method 'Mail.IE.IEDocC omplete(object,
ref object)' does not match delegate 'void System.EventHan dler(object,
System.EventAr gs)'

[for this code]
IE_Inst.Docume ntComplete += new System.EventHan dler(IEDocCompl ete);

[method defined here]
public void IEDocComplete(o bject pDisp, ref object url)
{

What exactly is it asking for?

A method to call with the signature "void Foo(object x, System.EventArg s
y)", not one with the signature "void IEDocComplete(o bject pDisp, ref
object url)".

--
Steve Walker