public void DetachFromPage()
{
if (this._navigationHelperWrapper == null)
{
return;
}
var wrapper = this._navigationHelperWrapper;
this._navigationHelperWrapper = null;
wrapper.LoadState -= this.LoadState;
wrapper.SaveState -= this.SaveState;
}
public void AttachToPage(Page page)
{
if (this._navigationHelperWrapper != null)
{
this.DetachFromPage();
}
if (NavigationHelperWrapper.Factory == null)
{
// wrapper fuctory is not assigned
throw new InvalidOperationException(
"Factory of NavigationHelperWrapper is not assigned yet." + Environment.NewLine +
"You should assign to NavigationHelperWrapper.Factory with conversion code" +
" from NavigationHelper in your solution.");
}
this._navigationHelperWrapper = NavigationHelperWrapper.Factory(page);
this._navigationHelperWrapper.LoadState += this.LoadState;
this._navigationHelperWrapper.SaveState += this.SaveState;
}
