Question

Is there a way the CheckedChanged event (or any other C# event) to be declared as User event? The problem is that if the property Checked is changed by code the Event is called and this is a thing that I would not want (for example in MFC the events are user events as opposed to property events). I by pass it with boolean flags and this is a little bit awkward in 2011!

Answer 1

You can unsubcribe the event. After you change the value you can subscribe again.

this.checkBox1.CheckedChanged -= new EventHandler(checkBox1_CheckedChanged);
this.checkBox1.Checked = true; // will not firing the CheckedChanged  event 
this.checkBox1.CheckedChanged += new EventHandler(checkBox1_CheckedChanged);

alternativly you can set a variable to bypass like this

bool isUser = true;

public Form1()
{
    InitializeComponent();

    isUser = false;
    this.checkBox1.Checked = true;
    isUser = true;
}

void checkBox1_CheckedChanged(object sender, EventArgs e)
{
    if (!isUser) // check if the change has fired by user
        return;

    // ... 
}

both will work

hope this helps.