问题
Sorry if I'm missing something obvious, but I'm trying to clear the controls (a series of user controls) from a FlowLayoutPanel - (panelName).Controls.Clear();. Unfortunately this doesn't seem to be calling the destructors for the objects on the panel - the User Objects column in the task manager just keeps going up and up, until it hits 10,000 and throws an excecption.
Does anyone know what I'm missing here?
回答1:
Not a solution, but a workaround - the objects do seem to be destroyed by this (rough, from memory) code:
while(FlowLayoutPanel.Controls.Count > 0)
FlowLayoutPanel.Controls.Remove(0);
回答2:
eftpotrm's workaround above still kept the user handles count growing for me, however, if you just manually dispose after removing the control, that fixed it 100% for me.
while (myFlowLayoutPanel.Controls.Count > 0)
{
var controltoremove = myFlowLayoutPanel.Controls[0];
myFlowLayoutPanel.Controls.Remove(controltoremove);
controltoremove.Dispose();
}
回答3:
.NET does not have the concept of destructors. .NET has something called "finalizers" which look syntactically like destructors in C#. For more information, check out Jeff Richter's awesome book on how the CLR works -- CLR via C#.
You may want the objects to implement the IDisposable pattern, and then call their Dispose() method when you're done with them.
回答4:
Try using a memory profiler, (e.g. ants) it will tell you what is keeping the control alive. Trying to 2nd guess this type of problem is very hard.
Red-gate gives 14 days tail that should be more then enough time to tack down this problem and decide if a memory profiler provides you with long term value.
There are lots of other memory profilers on the market (e.g. .NET Memory Profiler) most of them have free trials, however I have found that the Red-Gate tools are easy to use, so tend try them first.
来源：https://stackoverflow.com/questions/1378668/clearing-controls-from-flowlayoutpanel-not-calling-destructors