Export method and create interrupts from a .NET Component 2

[arnoldw]

I have created a custom made .NET Component (in Visual Studio .NET 2003) that contains a regular button and a checkbox. I build a .dll file and then use the .NET Component in a LabVIEW application. In LabVIEW I can get a long list of methods that the .NET Component supports (BeginInvoke(Delegate methid), BeginInvoke(Delegate method, Objects[] args), BringToFront(), Contains(Control ctl), and many more). I would like to add my own method that appears in this list of exported methods. How do I do that? Also, let's say the user pushes the button, what do I add to my C#-code to make this button press generate an interrupt in the LabVIEW application the .NET Component resides in? I have never before programmed in C# and this is my first .NET Component so please have that in mind when replying. If anybody can provide snippets of sample code, I'd be most grateful.

 

[JurkMonkey]

By interupt do you mean Event?

basically you should be able to add your own methods, properties and events to your component.

An example property would be
public bool CheckedValue
{
get
{
return checkBox1.Checked;
}
set
{
checkBox1.Checked = value;
}
}


as for an event, you could create one like this:

public event EventHandler ButtonClicked;

and then call it when your button is pressed.

private void button1_Click(object sender, EventArgs e)
{
this.ButtonClicked(this, EventArgs.Empty);
}


Try adding parts of this to your component and see what comes available to you.

http://www.ubuntu.com/

 

[arnoldw]

Thanks! I can't believe it was that simple to export a method. I found out that the events works like this:

using System;

namespace EventExample
{
public delegate void EventHappenedDelegate(Double dValue);

public class MyClass
{
public event EventHappenedDelegate EventHappened;

private void button1_Click(object sender, System.EventArgs e)
{
EventHappened(10); // Generate the event
}

}
}

 

[jmeckley]

i minor change i would recommend:

namespace EventExample
{
   public delegate void EventHappenedDelegate(Double dValue);
 
   public class MyClass
   {
      public event EventHappenedDelegate EventHappened;

      private void button1_Click(object sender, System.EventArgs e)
      {
         if(EventHappened != null) 
         {
            EventHappened(10);
         }
      }
 
   }
}

this way an exception is not thrown if the delegate is not defined.

Jason Meckley
Programmer
Specialty Bakers, Inc.