C# Tooltip not appearing on “Show”

问题

To fullfill a requirement I have to show a tooltip manually for 30 seconds. According to msdn I just have to use the "Show" method.

toolTip.Show(QuestionHelpText, btnHelp, 30000);

But I only get the standard tooltip behavior, meaning that the message appears half a second after my click (only because the mouse pointer is still over the button). I tried some variations like

toolTip.Show(QuestionHelpText, btnHelp);

but still, nothing happens.

Does anybody have an idea why that is?

Thanks

回答1:

I know a simple workaround

Put a lable (let's name it labelHelp) with empty text near your button

The following code should work

    private void btnHelp_Click(object sender, EventArgs e)
    {
        toolTip.Show(QuestionHelpText, labelHelp, 3000);
    }

回答2:

Where is "toolTip" declared?

MSDN doesn't indicate (on the ToolTip.Show Method documentation) that the Show method is a blocking call, so if you're declaring toolTip in a method and then pretty much straight afterwards exiting the method then toolTip will have fallen out of scope, causing it to not render or disappear.

回答3:

I think you need to set initialDelay property of tool tip

来源：https://stackoverflow.com/questions/1086153/c-sharp-tooltip-not-appearing-on-show