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c#winformscomboboxpopulate

C# - which event to populate a combobox before it's visible?

I'm currently updating it on click, but this results in the user being able to see the repopulation occur. Which other event can I use which will allow me to handle it myself, then show the combobox when i'm ready? ( after population)

Solution

  • I don't know what you're developing, but that combobox is probably on a window or so that will have an event that fires on show. Use that event to populate the combobox in.

    [edit] Ah Winforms. Use the Load event.

    [edit2] On each click eh.

    Alright. I found a dirty solutions that advises you to override the WndProc and capture messages, but I think it's better to inherit the combobox and override OnDropDown to perform you populating before calling the ancestor's OnDropDown method.

    You should populate the box when entered too, because a value may be selected using the keyboard (arrows) without even dropping down the box. You'll need both if you want it on each selection, because a click only causes the Enter event when the box didn't have focus before.