Navigationcachemode

Represents content that a Frame control can navigate to. This code shows how the content of the app window is set to a new Framewhich is then navigated to the default initial Page.

For example code that adds an AppBar to a page, see Quickstart: adding app bars or How to share an app bar across pages.

navigationcachemode

The Page class encapsulates content that the Frame control can navigate to. You will generally create your own page types that derive from the Page class, and use Page or a custom type as the root element for the XAML-declared content.

Most pages contain more than one UI element in total. You typically use a panel or items control as the immediate child of a Page, so that you can have the page contain and compose multiple elements of a UI. Some page item templates add navigation support and additional features.

Create as many pages as you need to present the content in your app, and then navigate to those pages by calling the Frame. Navigate method and passing in a type reference for the page to navigate to. By type reference, we mean an instance of a class that identifies a type in the type system, for the language you are using.

For Microsoft. NET that type is System. Typeand you can get a System. Initialize a TypeName by using the typeid of a class. Through Frame.

Navigateyou can also pass in a parameter object to initialize the page to a particular state. The parameter object is loosely typed but serialization of navigation history only works for basic types see Remarks in Frame. Navigate TypeObject. Pages that are navigated to as part of an activation generally pass data from the activation. Other navigation scenarios such as search result pages also have expectations of what info will be contained in the parameter.

By default, each navigation creates a new instance of the specific Page or subclass requested, and disposes the previous page instance. This happens even when navigating back to a previously visited page or when the new page type is the same as the previous page type. Apps that involve frequent navigation to the same pages can cache and reuse the page instances to make navigation more efficient.Microsoft Silverlight will reach end of support after October Learn more.

Gets or sets a value that indicates whether this page is cached and whether it is cached indefinitely. Navigation in System. Type: System. NavigationCacheMode The value that specifies the caching behavior for this page. You use the NavigationCacheMode property to specify whether a new instance of the page is created for each visit to the page or if a previously constructed instance of the page that has been saved in the cache is used for each visit. The default value for the NavigationCacheMode property is Disabled.

Set the NavigationCacheMode property to Enabled or Required when a new instance of the page is not essential for each visit. By using a cached instance of the page, you can improve the performance of your application and reduce the load on your server. Setting NavigationCacheMode to Required means that the page is cached regardless of the number of cached pages specified in the CacheSize property.

Pages marked as Required do not count against the CacheSize total. Setting NavigationCacheMode to Enabled means the page is cached, but it is eligible for disposal if the number of cached pages exceeds the value of CacheSize.

Set the NavigationCacheMode property to Disabled if a new instance must be created for each visit. For example, you should not cache a page that displays information that is unique to each customer.

The OnNavigatedTo method is called for each request, even when the page is retrieved from the cache. You should include in this method code that must be executed for each request rather than placing that code in the Page constructor.

navigationcachemode

The following example shows a Silverlight page that retrieves and displays data from a data source. The data that is retrieved is the performance schedule for an arts organization for the current month. The page is not likely to change often and the data retrieval is potentially time-consuming, so the NavigationCacheMode property is set to Enabled.

navigationcachemode

The implementation of the data retrieval and display is not shown in this example. For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Controls Namespace. Skip to main content. Exit focus mode. Property Value Type: System.Guest Post by Sebastien Lachance.

Windows 10 is here. There is no better time to start developing apps for the Windows 10 ecosystem. If you are new to Windows 10 app development or even 8. This article is about one important property related to navigation please continue to read! However, if your application has more than one page, you will need to use some navigation methods. You can download the sample here. Rename BlankPage1. Here Frame.

navigationcachemode

GoBack will return to the previous page in the stack. In our case, it returns to the MainPage. You will see the expected result. However, what do you think will happen if you click on the Back button? There are 2 possibilities:. If you are familiar with the Silverlight model, you know that returning to the MainPage will include the numbers. However, in Windows 10, the MainPage will be instantiated again and the numbers will be reset. The decision is debatable, but we have to deal with it and fortunately, Microsoft offers the property NavigationCacheMode if you want to override the default behaviour of instantiating the page again.

There are lots of scenarios where you will set the NavigationCacheMode to Required. One example is when a page contains a GridView or a ListView with many items. If you want to know more about Windows 10, here is a list of great resources from Microsoft all free :.

Skip to main content. Exit focus mode.Microsoft Silverlight will reach end of support after October Learn more. Navigation in System.

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You specify whether a new instance of the page is created for each visit to the page or whether a previously constructed instance of the page that has been saved in the cache is used for each visit. The default value for the NavigationCacheMode property is Disabled. Set the NavigationCacheMode property to Enabled or Required when a new instance of the page is not essential for each visit. By using a cached instance of the page, you can improve the performance of your application and reduce the load on your server.

Set the NavigationCacheMode property to Disabled if a new instance must be created for each visit. For example, you should not cache a page that displays information that is unique to each customer.

The OnNavigatedTo method is called for each request, even when the page is retrieved from the cache. You should include in this method code that must be executed for each request rather than placing that code in the Page constructor. The following example shows a Silverlight page that retrieves and displays data from a data source. The data that is retrieved is the performance schedule for an arts organization for the current month.

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The page is not likely to change often and the data retrieval is potentially time-consuming, so the NavigationCacheMode property is set to Enabled.

The implementation of the data retrieval and display is not shown in this example. For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Navigation Namespace. Skip to main content. Exit focus mode. Specifies how the page is cached when used within a frame. Members Member name Description Disabled The page is never cached and a new instance of the page is created on each visit.

Required The page is cached and the cached instance is reused for every visit regardless of the cache size for the frame. Enabled The page is cached, but the cached instance is discarded when the size of the cache for the frame is exceeded.

Examples The following example shows a Silverlight page that retrieves and displays data from a data source. This namespace declaration is valid for Silverlight 4 only. For more information, see the help topic "Prefixes and Mappings for Silverlight Libraries". Version Information Silverlight Supported in: 5, 4, 3. Platforms For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

See Also Reference System. Navigation Overview.When navigating forward to GroupDetailsPage and then back, this is the output: Two instances of the same page has been created: One when navigating forward to this page and one when we navigated back to the same page. This is a big difference when compared to the WP7-platform where navigating back always uses the same instance of a page. Every page has a property called NavigationCacheMode which can be used to change how the navigation caching works on that particular page.

The NavigationCacheMode has three possible values. Required 1 The page is cached and the cached instance is reused for every visit regardless of the cache size for the frame. Enabled 2 The page is cached, but the cached instance is discarded when the size of the cache for the frame is exceeded. After navigating two times forward to the page, we can see that only one instance was created: This means that NavigationCacheMode affects both navigating backward and navigating forward.

How to mimic Windows Phone 7 navigation model Is it possible to completely mimic the Windows Phone 7 navigation model? Maybe using this functionality in combination with the NavigationCacheMode-property could provide a similar navigation model. The navigation cache is also an interesting aspect to think of when using the MVVM pattern. This may open up new opportunities.When a user navigates from one page to another in a Windows 10 app, the target view and associated view-model is, by default, instantiated every time.

This is even true when the user navigates to a view then to a second view, then returns to the first view. This is good because the resulting view is always fresh.

NavigationCacheMode: A property that can save you a headache!

It would be great if a developer could instruct a view to cache itself in these cases. By default it is Disabled. This means every time the user navigates to the page, the page is instantiated. Caching is difficult on machines that have limited memory. Because every cached page equals some amount of memory consumption, it increases the opportunity for your app to be automatically terminated by the operating system.

This is the limit to the number of pages that can be cached.

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When cache mode is Enabledthis is obeyed meaning that if that limit is set and the user continues to navigate to new pages, the older pages are removed from the cache. This, in turn, means that if the user navigates back to one of those pages, the page will be instantiated as if for the first time. In other words, those pages are always kept in the cache. Messaging is a pattern for view-models to communicate without requiring a reference to one another.

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Again, there are many out there and they are all effective. If some view causes the data displayed in another view to be deleted, the developer cannot allow the user to navigate forward or back and view the data that is dead. In Template 10, this is done with NavigationService.

NavigationCacheMode Enumeration

Clear. Some of the visual controls on your view may need to be manually updated to reflect the change in navigation. You should assume your view is new every time. In other words, don't rely on caching. There could be circumstances that could cause your view or view-model to be re-instantiated on navigation e. No matter how you use cache, you must write your code defensively so that if caching should not work or be overloaded in some way, your app continues to deliver an excellent user experience.

Remember you only need to set this in the constructor of those pages that enable or require the NavigationCache. Here's how you set the cache mode value:. As noted above, Enabled will obey the setting of CacheSize.Gets or sets the navigation mode that indicates whether this Page is cached, and the period of time that the cache entry should persist. For example code that uses NavigationCacheMode, see Navigation.

The difference in behavior is that Enabled might not be cached if the frame's cache size limit CacheSize is exceeded, whereas Required always generates an entry no matter the size limit. If you want to change the value of NavigationCacheMode programmatically to Enabled or Requiredyou can only set these values in the constructor for the page. If you change the value of NavigationCacheMode from Required or Enabled to Disabledthe page is flushed from the cache. The page is not simply marked as available to be flushed when the configured CacheSize is exceeded.

You may also leave feedback directly on GitHub. Skip to main content. Exit focus mode. Navigation Cache Mode Page. Controls Windows. Is this page helpful? Yes No. Any additional feedback?

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