Windows.Storage.AccessCache.StorageItemMostRecentlyUsedList

-description

Represents your app's most recently used list (MRU) (obtained from the static StorageApplicationPermissions.MostRecentlyUsedList property). You use your MRU to track items (files and/or folders) that the user has accessed most recently. Items are stored in the MRU as StorageFile and StorageFolder objects.

-remarks

Use the most recently used (MRU) list to track files and/or locations that your user accesses frequently.

This list can store up to 25 items. While the app must add items to the MRU in order to track them, Windows maintains the 25-item limit by removing stale items if necessary.

To see more code examples, see the File picker sample and the File access sample.

To learn about using the FutureAccessList and MostRecentlyUsedList, see Track recently used files and folders.

To learn more about what files and locations your app has permission to access, see File access permissions.

-examples

This example demonstrates how to add an item to the app's FutureAccessList and MostRecentlyUsedList.

StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
    // Add to MRU with metadata (For example, a string that represents the date)
    string mruToken = Windows.Storage.AccessCache.StorageApplicationPermissions.MostRecentlyUsedList.Add(file, "20120716");

    // Add to FA without metadata
    string faToken = Windows.Storage.AccessCache.StorageApplicationPermissions.FutureAccessList.Add(file);  
}
else
{
    // The file picker was dismissed with no file selected to save
}

#include <sstream>
#include <winrt/Windows.Storage.h>
#include <winrt/Windows.Storage.AccessCache.h>
#include <winrt/Windows.Storage.Pickers.h>
using namespace winrt;
using namespace Windows::Storage::Pickers;
using namespace Windows::Storage;
...
winrt::fire_and_forget AddToLists()
{
    FileSavePicker savePicker;
    auto plainTextExtensions{ winrt::single_threaded_vector<winrt::hstring>() };
    plainTextExtensions.Append(L".txt");
    savePicker.FileTypeChoices().Insert(L"Plain Text", plainTextExtensions);
    savePicker.SuggestedFileName(L"New Document");

    StorageFile file{ co_await savePicker.PickSaveFileAsync() };
    if (file)
    {
        // Add to MRU with metadata (For example, a string that represents the date)
        winrt::hstring mruToken { Windows::Storage::AccessCache::StorageApplicationPermissions::MostRecentlyUsedList().Add(file, L"20120716") };

        // Add to FA without metadata
        winrt::hstring faToken { Windows::Storage::AccessCache::StorageApplicationPermissions::FutureAccessList().Add(file) };
    }
    else
    {
        // The file picker was dismissed with no file selected to save
    }
}

We recommend that you store the tokens that are returned by StorageApplicationPermissions.MostRecentlyUsedList.Add and StorageApplicationPermissions.FutureAccessList.Add so that you can use them to retrieve the respective list entry for the item that you added. In the example, we store the tokens in mruToken and faToken respectively but we don't do anything else with them.

Additionally, the savePicker variable in the example contains a FileSavePicker object that was created by the sample. To learn more about saving files with file picker, see Save a file with a picker. To learn about accessing files, see Open files and folders with a picker.

-see-also

StorageItemMostrecentlyUsedList.mostRecentlyUsedList property