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POHow to expose events in a WinForms custom control
 

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  1. POHow to expose events in a WinForms custom control
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    <p>I've developed a custom control that acts like a group box with a check box over the group label. The idea being, once the check box is unchecked all the controls in the group are disabled.</p> <p>I need to expose the Check changed event so that external actions could be performed if required. I've also exposed the Check state changed.</p> <p>Currently, when the control is used it changes the check state when any of the controls in the group loose focus.</p> <p>When I handle the check changed event, should I then re-fire the event for any external handlers?</p> <p><img src="https://i.stack.imgur.com/tzptj.jpg" alt="enter image description here"><img src="https://i.stack.imgur.com/NM8E1.jpg" alt="enter image description here"></p> <p>The events defined:</p> <pre><code>/// &lt;summary&gt; /// Event to forward the change in checked flag /// &lt;/summary&gt; public event EventHandler CheckedChanged; /// &lt;summary&gt; /// Event to forward the change in checked state of the checkbox /// &lt;/summary&gt; public event EventHandler CheckStateChanged; </code></pre> <p>The event handler code:</p> <pre><code>private void chkBox_CheckedChanged(object sender, EventArgs e) { // Disable the controls within the group foreach( Control ctrl in this.Controls ) { if( ctrl.Name != "chkBox" &amp;&amp; ctrl.Name != "lblDisplay" ) { ctrl.Enabled = this.chkBox.Checked; } } // Now forward the Event from the checkbox if (this.CheckedChanged != null) { this.CheckedChanged(sender, e); } } private void chkBox_CheckStateChanged(object sender, EventArgs e) { // Forward the Event from the checkbox if( this.CheckStateChanged != null ) { this.CheckStateChanged( sender, e ); } } </code></pre>
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    1. COThis looks correct. Whats the problem?
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    2. COWhen the user enters or changes any of the fields, the controls in the group get disabled. They then have to re-enable the group and move onto the next control.
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