Button tooltip not getting localized

问题

I have an extended button class as follows;

class ExtendedButton : Button
{
    private ToolTip _tooltip = new ToolTip();

    public ExtendedButton()
    {
        _tooltip.SetToolTip(this, StringResources.MyLocalizedTooltipString);
    }
}

In above code, 'StringResources.MyLocalizedTooltipString' contains strings for various languages. But when I change thread culture, tooltip text does not get changed. How to achieve that? Any help would be appreciated.

回答1:

It's normal. SetToolTip method accepts string and it will show the text that extracted from resource based on the current culture when calling SetToolTip and changing the culture at run-time will not have any impact on it. So here since setting tooltip is performed in constructor of your button, then the culture of thread at that moment will be used.

If you want your tooltip dynamically use the current culture automatially, as an option you can set a dummy text as tooltip (to enable the tooltip) and then handling Popup event of tooltip, assign the localized value to the tooltip:

class ExtendedButton : Button
{
    private ToolTip _tooltip = new ToolTip();

    public ExtendedButton()
    {
        _tooltip.Popup += new PopupEventHandler(_tooltip_Popup);
        _tooltip.SetToolTip(this, "DUMMYTEXT");
    }

    void _tooltip_Popup(object sender, PopupEventArgs e)
    {
        if (_tooltip.GetToolTip(this) != StringResources.MyLocalizedTooltipString)
            _tooltip.SetToolTip(this, StringResources.MyLocalizedTooltipString);
    }
}

Note: If your goal is not making the tooltip dynamically localizable and you only want a localizable tooltip, the way Localizable property of Form works, go to designer of your ExtendedButton component and set Localizable property to true and then use different tooltip texts for different cltures.

But keep in mind, the value can not be changed dunamically at runtime, after the component is created.

Here is an example:

Thread.CurrentThread.CurrentUICulture = CultureInfo.GetCultureInfo("fa-IR");
var f = new Form();
f.Controls.Add(new ExtendedButton());
f.Show();

回答2:

To comprehensively set the culture, you need to set the CurrentCulture and CurrentUICulture for the current thread, and if you're going to create any new threads in your application, the DefaultThreadCurrentCulture and DefaultThreadCurrentUICulture.

For example:

var frenchCulture = new CultureInfo("fr-FR");

Thread.CurrentThread.CurrentCulture = frenchCulture;
Thread.CurrentThread.CurrentUICulture = frenchCulture;
CultureInfo.DefaultThreadCurrentCulture = frenchCulture;
CultureInfo.DefaultThreadCurrentUICulture = frenchCulture;

This should be done in your program's Main method, before any forms are loaded and before Application.Run is called.

From MSDN, regarding setting the default thread UI culture:

Unless it is set explicitly, the value of the DefaultThreadCurrentUICulture property is null, and the current culture of all threads in an application domain that have not been assigned an explicit culture is defined by the default Windows system culture.

来源：https://stackoverflow.com/questions/38353122/button-tooltip-not-getting-localized

标签

.net

winforms

localization

tooltip