Raise an event in VB.NET

Question

I need to transform the following in VB.NET from C# (.NET 4)

class MyControl

public event EventHandler ContentScaleChanged;

if (myControlOther.ContentScaleChanged != null)
{
    myControlOther.ContentScaleChanged(c, EventArgs.Empty);
}

please help

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Best regards, Sergiu

Answer 1

Can you show where you need this (show what c in this context is), because mostly raising an event in VB is just

RaiseEvent(me, EventsArgs.Empty)

http://msdn.microsoft.com/en-us/library/fwd3bwed(v=vs.100).aspx

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Success
Cor

Answer 2

'' declaration
Public Event ContentScaleChanged As EventHandler

'' raising the event
RaiseEvent ContentScaleChanged(Me, New EventArgs)

While raising for events, you don't need to check for nothing(null) in VB.

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Pradeep, Microsoft MVP (Visual Basic)
http://pradeep1210.wordpress.com

Answer 3

attention!

the C# code was not ContentScaleChanged(c, EventArgs.Empty), but myControlOther.ContentScaleChanged(c, EventArgs.Empty);

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Best regards, Sergiu

Answer 4

attention!

the C# code was not ContentScaleChanged(c, EventArgs.Empty), but myControlOther.ContentScaleChanged(c, EventArgs.Empty);

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Best regards, Sergiu

If the event is defined inside the class from where it is being raised, you will directly call

RaiseEvent EventName(Me, New EventArgs)

EDIT (statement corrected) :
If the event is defined in another class, then you can't raise that event. In such cases, define an event inside your class. Then Raise it on appropriate events of that object.

Answer 5

Yea if I now understand you right, is this something often done wrong by C# developers. 

They raise an event inside a class. I don't know whey they always do it because for the same the method can be called direct without the event. 

If this is not done from an extra thread then simply do.

ContentscaleChanged(c, EventArgs.Empty)

and then in C# end this with a semicolon.

There is no difference in this between VB and C# although I've seen doing this more wrong by C# developers then by VB. (Although they do that often with the click which had to be done AFAIK VB4 like that)

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Success
Cor

Answer 6

Sorry... my bad. I think my head was spinning. :p

Please read it like this:

If the event is defined inside the class from where it is being raised, you will directly call

RaiseEvent EventName(Me, New EventArgs)

If the event is defined in another class, then you can't raise that event. In such cases, define an event inside your class. Then Raise it on appropriate events of that object.

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Pradeep, Microsoft MVP (Visual Basic)
http://pradeep1210.wordpress.com