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POHow to automate clean up of ToolTip in UserControl
 

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  1. POHow to automate clean up of ToolTip in UserControl
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    <p>I've been tracking down a memory leak and I've narrowed it down to a ToolTip that is allocated in a UserControl-derived class.</p> <p>The ToolTip is allocated in the allocated in the control's constructor and initialized in the Load event like this:</p> <pre><code>public class CommonProfile : System.Windows.Forms.UserControl { private ToolTip toolTip1; ... public CommonProfile() { InitializeComponent(); // Create the ToolTip and associate with the Form container. toolTip1 = new ToolTip(this.components); } private void CommonProfile_Load(object sender, System.EventArgs e) { // Set up the delays for the ToolTip. toolTip1.AutoPopDelay = 5000; toolTip1.InitialDelay = 1000; toolTip1.ReshowDelay = 500; // Force the ToolTip text to be displayed whether or not the form is active. toolTip1.ShowAlways = true; // Set up the ToolTip text toolTip1.SetToolTip(this.btnDeleteEntry, "Delete this Profile"); toolTip1.SetToolTip(this.lblProfileType, "Edit this Profile"); toolTip1.SetToolTip(this.lblProfileData, "Edit this Profile"); toolTip1.SetToolTip(this.picFlagForUpdate, "Toggle Flag for Update"); } } </code></pre> <p>The control's parent has a lifetime that exceeds the control's lifetime. This control is created on the fly and added to a panel control and then subsequently removed from the panel control.</p> <p>I found that the control's Dispose member was not getting called, apparently because references to the ToolTip remain.</p> <p>I added a Shutdown method like this:</p> <pre><code>public void Shutdown() { toolTip1.RemoveAll(); } </code></pre> <p>Calling the Shutdown method eliminates the leak and Dispose is eventually called.</p> <p>Unfortunately, this solution requires that whoever uses the control remembers to call the Shutdown method when they are finished with it.</p> <p>I'd like to know if there is some way that I can automate this so that it happens without the need to call the Shutdown method explicitly.</p>
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    1. COI guess you need to call dispose on the tooltip either in the dispose of your usercontrol or you could have a clean up function which does that for you, like your shutDown method.
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    2. CO1. Look here [http://stackoverflow.com/questions/672980/dispose-on-user-controls-really-meant-to-edit-the-designer-cs-file][1] [1]: http://stackoverflow.com/questions/672980/dispose-on-user-controls-really-meant-to-edit-the-designer-cs-file
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