<PackageReference Include="System.Security.Permissions" Version="10.0.0-preview.5.25277.114" />

IsolatedStoragePermissionAttribute

public abstract class IsolatedStoragePermissionAttribute : CodeAccessSecurityAttribute
Allows security actions for IsolatedStoragePermission to be applied to code using declarative security.
public IsolatedStorageContainment UsageAllowed { get; set; }

Gets or sets the level of isolated storage that should be declared.

public long UserQuota { get; set; }

Gets or sets the maximum user storage quota size.

protected IsolatedStoragePermissionAttribute(SecurityAction action)

Initializes a new instance of the IsolatedStoragePermissionAttribute class with the specified SecurityAction.