Returns the System.Security.Permissions.IsolatedStoragePermission from within a given permission set that represents access to isolated storage.
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An object that represents the System.IO.IsolatedStorage.IsolatedStorageFile object in the supplied permission set. The value is null if there is no permission of type System.Security.Permissions.IsolatedStorageFilePermission in the supplied set.
This method is called during a store's initialization to determine the isolated storage file permissions that are granted to an assembly. The System.IO.IsolatedStorage.IsolatedStorage base class uses these permissions to determine the quota.