This example creates and reads a setting named exampleSetting. Call the ApplicationDataContainerSettings. Remove method to delete the exampleSetting setting when you have finished with it. Note that to access the RoamingSettings , use the same process outlined in the example, except change the occurrences of localSettings to roamingSettings. For both LocalSettings and RoamingSettings , the name of each setting can be characters in length at most.
Each setting can be up to 8K bytes in size and each composite setting can be up to 64K bytes in size. On the Settings page, click the View code button to view the Settings. Notice that the Settings class in Settings. For more information about accessing application settings by using the My.
Settings object, see Access application settings. NET Framework. The values of any user-scoped settings that the user changes at run time for example, the position of a form are stored in a user. Notice that the default values are still saved in app. If any user-scoped settings are changed during run time, for example in testing the application, and want to reset these settings to their default values, click the Synchronize button.
We strongly recommend that you use the My. Settings object and the default. This is because you can use the Settings Designer to assign properties to settings, and, additionally, user settings are automatically saved before application shutdown. However, your Visual Basic application can access settings directly. In that case you have to access the MySettings class and use a custom.
You must save the user settings before ending the application, as you would do for a C application; this is described in the following section. In languages other than Visual Basic, such as C , you must access the Settings class directly, as shown in the following Visual C example.
You must explicitly call the Save method of this wrapper class in order to persist the user settings. You usually do this in the Closing event handler of the main form. The version number is different from the app version and can be set at will. Although not enforced, it is highly recommended that you use increasing version numbers, since undesirable complications including data loss could occur if you try to transition to a lower data version number that represents newer data.
App data only roams between installed apps with the same version number. For example, devices on version 2 will transition data between each other and devices on version 3 will do the same, but no roaming will occur between a device running version 2 and a device running version 3. If you install a new app that utilized various version numbers on other devices, the newly installed app will sync the app data associated with the highest version number.
Developers can lock their device in order to trigger a synchronization of roaming app data. If it seems that the app data does not transition within a certain time frame, please check the following items and make sure that:.
To use roaming app data, you need to register for roaming data changes and retrieve the roaming data containers so you can read and write settings. The DataChanged event notifies you when roaming data changes.
This example sets DataChangeHandler as the handler for roaming data changes. RoamingSettings property to get the settings and the ApplicationData. RoamingFolder property to get the files. Use the ApplicationDataContainer. Values property to access the settings in the roamingSettings container we got in the previous section. This example creates a simple setting named exampleSetting and a composite value named composite.
To create and update a file in the roaming app data store, use the file APIs, such as Windows. To open and read a file in the roaming app data store, use the file APIs, such as Windows. The temporary app data store works like a cache. Its files do not roam and could be removed at any time. The System Maintenance task can automatically delete data stored at this location at any time.
The user can also clear files from the temporary data store using Disk Cleanup. Temporary app data can be used for storing temporary information during an app session.
There is no guarantee that this data will persist beyond the end of the app session as the system might reclaim the used space if needed. The location is available via the temporaryFolder property. TemporaryFolder property to get the files. The next steps use the temporaryFolder variable from this step. To create and update a file in the temporary app data store, use the file APIs, such as Windows.
To open and read a file in the temporary app data store, use the file APIs, such as Windows. To help you organize your app data settings and files, you create containers represented by ApplicationDataContainer objects instead of working directly with directories. You can add containers to the local, roaming, and temporary app data stores.
Containers can be nested up to 32 levels deep. To create a settings container, call the ApplicationDataContainer. CreateContainer method. NET 2. I would like this program to run on any of the supported versions of Windows. Thanks in advance, Michael Bate.
Wednesday, January 7, PM. That's not the way it works. You decide if the data should move along with the user if she logs in on another workstation or if the data only makes sense if it is tied to the machine.
Or is large. They won't return the same directory in a normal setup. That said, I've yet to see a network where roaming was implemented. But I don't get out much. Hans Passant.
Thursday, January 8, AM.
0コメント