Reload page in metro app C#

Question

I'm developing metro app using Windows 8 RTM and C#(VS 2012 RTM), I'm stuck with page reload, Can any one explains me how to reload page with out navigating to same page again. Brief: I'm developing metro app with multilingual support. When user selects the language I'm overriding primary language by below code

Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = "de";

and reload the page by using this code

this.Frame.Navigate(this.GetType());

Language changed to "de",But when i press "Back" on page its navigating same page instead of navigating to previous page.Did i miss something, Can someone please explains me how to do this. Thanks in advance

Solution 1

This will refresh your page:

var _Frame = Window.Current.Content as Frame;
_Frame.Navigate(_Frame.Content.GetType());
_Frame.GoBack(); // remove from BackStack

• Handling OnNavigatingFrom() you can save your page's data and state.
• Handling OnNavigatingTo() you can load your page's data and state.

As a caveat, my sample does not account for page parameters, you may need to. Also, another caveat, my sample reloads your page twice. But the GoBack() is necessary to remove the new entry from the BackStack. Unlike WP, Frame does not have Refresh(). Also, the BackStack does not have Remove().

UPDATE

I no longer use the above approach. I use this:

public bool Reload() { return Reload(null); }
private bool Reload(object param)
{
    Type type = this.Frame.CurrentSourcePageType;
    if (this.Frame.BackStack.Any())
    {
        type = this.Frame.BackStack.Last().SourcePageType;
        param = this.Frame.BackStack.Last().Parameter;
    }
    try { return this.Frame.Navigate(type, param); }
    finally { this.Frame.BackStack.Remove(this.Frame.BackStack.Last()); }
}

Solution 2

I’m not sure I fully understand what you are trying to do, so this may be wrong.

By calling that line of code when you are refreshing the page, you are creating a brand new object of the current type and navigating to it, so this does not save changes the user makes while they are on the current page.

Are you using any type of design pattern? For things like this I use MVVM (using the MVVM light library) which implements a really cool navigation service which will keep stuff like this in check.

Comments

[Raj Kumar]

Thanks lookitskris, But I'm not using MVVM pattern here, is there any way that i can reload page with out creating new object,Please help me.

[lookitskris]

check out the Refresh method on the Frame object

[Joris Weimar]

for anyone who cares: when using (complex) page parameters, just store the parameter in your page base class. then you just pass it in: _Frame.Navigate(..., savedParameter). To prevent loading twice (something to worry about in case you have heavy loading in NavigatedTo) is setting a global flag "IsReloading". In onnavigatedto if set to true, cancel further loading and set it to false.

[Jerry Nixon]

Samples are so much better than paragraphs.

[Joris Weimar]

contributions are so much better than critiques

[Geotinc]

It works only if Frame is not saved with SuspensionManager. If the frame has been save with SuspensionManager, the GoBack method displays the page with the same language as previously. Any idea ?

[Jerry Nixon]

Yes, navigate to the correct page and pass the correct parameter.

[vent]

Also, if your page has NavigationCacheMode, set it to Disabled first this.NavigationCacheMode = NavigationCacheMode.Disabled;

[Stephen Hosking]

Looks like Refresh is not available on a Frame in WinRT. msdn.microsoft.com/en-us/library/…