auk_ie
asked on
Property Notification
Hello, Is there a way I can create a property in a class (eg. public int m_nNumber), and somehow create an event handler which is called each time this property is changed?
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
just use System.EventArgs rather than NumChangedEventArgs
public void NumberChanged(object sender, System.EventArgs e)//event action
{
MessageBox.Show(number.ToS
}
public void NumberChanged(object sender, System.EventArgs e)//event action
{
MessageBox.Show(number.ToS
}
ASKER
Yes this is what I had,
public event System.EventHandler NumberChanged; //What does this line do.
//Duplicate declaration
public void NumberChanged(object sender, System.EventArgs e)//event action
{
MessageBox.Show(number.ToS
}
public event System.EventHandler NumberChanged; //What does this line do.
//Duplicate declaration
public void NumberChanged(object sender, System.EventArgs e)//event action
{
MessageBox.Show(number.ToS
}
so, what compile error did you get ?
I think you'd better use the full version of event
or you may simplely write a function to call it
//define a function
void NumberChanged(int number)
{
//doing something
}//if in a class you can overwrite it for different usage
public int Number
{
get
{
return number;
}
set
{
number = value;
NumberChanged(number);
}
}
or you may simplely write a function to call it
//define a function
void NumberChanged(int number)
{
//doing something
}//if in a class you can overwrite it for different usage
public int Number
{
get
{
return number;
}
set
{
number = value;
NumberChanged(number);
}
}
ASKER
eternal_21, How would you write a handler for the public event System.EventHandler NumberChanged;
I tried
public void NumberChanged(object sender, NumChangedEventArgs e)//event action
{
MessageBox.Show(number.ToS
}
But that doen't compile