This feature provides the user with a complete backup in case their device is lost, stolen, or damaged. Because iCloud only provides 5 Gb of free space to each user and to avoid unnecessarily using bandwidth, Apple expects applications to only backup essential user-generated data.
To comply with the iOS Data Storage Guidelines, you should limit the amount of data that gets backed up by adhering to the following items:. When SetSkipBackupAttribute is true the file will not be backed-up, regardless of the directory it is stored in even the Documents directory. You can query the attribute using the GetSkipBackupAttribute method, and you can reset it by calling the SetSkipBackupAttribute method with false , like this:.
Since App Extensions run as part of a host application as opposed to their containing app , the sharing of data isn't automatic included so extra work is required. App Groups are the mechanism iOS uses to allow different apps to share data. If the applications have been properly configured with the correct entitlements and provisioning, they can access a shared directory outside of their normal iOS sandbox.
This value must also be referenced in each project's Entitlements. The iOS app and the extension can also share files using a common file path given they have been properly configured with the correct entitlements and provisioning :. If the Group Path returned is null , check the configuration of the entitlements and the provisioning profile and make sure that they are correct.
When a new version of your application is downloaded, iOS creates a new home directory and stores the new Application Bundle in it. This article showed that file system operations with Xamarin. NET application. It also introduced the Application Sandbox and examined the security implications that it causes.
Next, it explored the concept of an Application Bundle. Finally, it enumerated the specialized directories available to your application and explained their roles during application upgrades and backups. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. File system access in Xamarin. Please rate your experience Yes No. Any additional feedback? Note Although this policy was first introduced with iOS 5 which seems like a long time ago the guidance is still relevant to apps today.
Important If the Group Path returned is null , check the configuration of the entitlements and the provisioning profile and make sure that they are correct. In this article. In iOS 7 and earlier , this is the ApplicationBundle directory where your application executable is stored.
If you need to access the content files inside your Application Bundle, the path to this directory is available via the NSBundle. BundlePath property.
Use this directory to store user documents and application data files. The contents of this directory can be made available to the user through iTunes file sharing although this is disabled by default. As long as sensitive files remain hidden, these files will not be exposed and potentially moved, modified, or deleted by iTunes if file sharing is enabled in a future version. You can use the Environment. GetFolderPath Environment.
MyDocuments method to get the path to the Documents directory for your application. The contents of this directory are backed up by iTunes. The Library directory is a good place to store files that are not created directly by the user, such as databases or other application-generated files.
The contents of this directory are never exposed to the user via iTunes. You can create your own subdirectories in Library; however, there are already some system-created directories here that you should be aware of, including Preferences and Caches. DirectoryInfo classes from the System.
IO namespace. These examples do not provide a progress bar or any other user interface. If you want to provide a standard progress dialog box, see How to provide a progress dialog box for file operations. Use System. FileSystemWatcher to provide events that will enable you to calculate the progress when operating on multiple files.
Another approach is to use platform invoke to call the relevant file-related methods in the Windows Shell. Skip to main content. Thank you. Microsoft makes no warranties, express or implied, with respect to the information provided here. Deletes the specified directory and, if indicated, any subdirectories and files in the directory.
A file with the same name and location specified by path exists. NET Framework and. NET Core versions older than 2. You can query for invalid characters by using the GetInvalidPathChars method. The following example shows how to create a new directory and subdirectory, and then delete only the subdirectory. This method behaves identically to Delete String, Boolean with false specified for the second parameter.
The path parameter may specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.
Trailing spaces are removed from the end of the path parameter before deleting the directory.
0コメント