public static XafApplication WebApplication(this IXAFAppDomain xafAppDomain) => (XafApplication)xafAppDomain.WebApplicationType()?.GetProperty("Instance")?.GetValue(null);
public static DevExpress.ExpressApp.XafApplication WebApplication(this IXAFAppDomain xafAppDomain) => _webApplication ??= (DevExpress.ExpressApp.XafApplication)xafAppDomain.WebApplicationType()?.GetProperty("Instance")?.GetValue(null);