How to Efficiently Pass Values Between XAML Pages?

Passing Values between XAML Pages

Passing parameters between XAML pages is a fundamental aspect of effective application design. Whether you're navigating through pages in a Windows Phone, Silverlight, WPF, or Windows 8 application, understanding the appropriate methods for passing data will enhance your application's functionality and user experience.

1. Using the Query String

For simple data transfer, the query string can be employed. Data passed through this method must be converted to strings and URL-encoded.

Navigating Page:

page.NavigationService.Navigate(new Uri("/Views/Page.xaml?parameter=test", UriKind.Relative));

Destination Page:

string parameter = string.Empty;
if (NavigationContext.QueryString.TryGetValue("parameter", out parameter)) {
    this.label.Text = parameter;
}

2. Using NavigationEventArgs

NavigationEventArgs provides access to parameters passed through method calls during navigation.

Navigating Page:

page.NavigationService.Navigate(new Uri("/Views/Page.xaml?parameter=test", UriKind.Relative));

// and ...

protected override void OnNavigatedFrom(NavigationEventArgs e)
{
    Page destinationPage = e.Content as Page;
    if (destinationPage != null) {

        destinationPage.PublicProperty = "String or object..";
    }
}

Destination Page:

// Use the value of "PublicProperty"..

3. Using Manual Navigation

Manual navigation allows custom parameter passing through the constructor.

Navigating Page:

page.NavigationService.Navigate(new Page("passing a string to the constructor"));

Destination Page:

public Page(string value) {
    // Use the value in the constructor...
}

Difference between Uri and Manual Navigation

The key distinction lies in the application life cycle. Manually created pages are retained in memory, while pages navigated via Uri are not.

Passing Complex Objects

Method 1 and 2 can be used to pass complex objects, or alternatively, custom properties can be added to the Application class or data can be stored in Application.Current.Properties.

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