I would like to test how my app would work under different cultures.
So for testing purposes, under Windows 7, I tried to change
Language for non-Unicode programs
Region and Language
Thread.CurrentThread.CurrentUICulture = New CultureInfo("fr")
Label1.Text = My.Resources.Form1Resource.TestString
The knob is on the "Keyboard and Languages" tab of the "Region and Language" control panel. Click on the "Install/uninstall languages…" button to get started. If you only have one UI language installed, you will need to install another one. The wizard should walk you through this. You will also have to log off and log back on in order to see the effect.
In most cases, the
CurrentUICulture property is going to return the first language in the list of user preferred UI languages, so setting this should be sufficient. The other languages are used as fallback languages in case necessary resources are not available in the preferred language.
But the actual algorithm that
CurrentUICulture uses to determine the UI culture is a bit more complicated:
DefaultThreadCurrentUICultureproperty. If that is not
null, it returns whatever UI culture has been set as the default for all threads in the current application domain.
null, it calls the
Of course, this method of testing might be a little overkill because it's changing global settings (at least, for your entire user account). Because the current UI culture is maintained per-thread, you can modify it just for your application's thread. To do this, set the
Thread.CurrentUICulture property. If your application is multi-threaded, you might want to set the
DefaultThreadCurrentUICulture property to ensure that additional threads pick up the correct culture. The question says that you already found this, but I'm not clear on why you don't want to use it.
Also, be careful about confusing the UI language with the locale; they are not the same.
CurrentCulture is the locale, which sets things like date/number/time formats and the sort order.
CurrentUICulture is the UI language, which deals with loading the correctly localized resources. They might be the same, and I suppose they often are, but they do not have to be. There are cases where a user might want them to be different; for example, if they speak English and prefer the localized English version, but want to see things like dates and times formatted according to their custom.