Setting a style which in resource dictionary to a TextBox raises an exception

Question

I have a TextBox named "textBox", and I want to change its style in code. I can use a key to find this style in resource dictionary. But when I set this style to the textBox, an exception was raised.

Is that I missed something or did I do something wrong?

if(App::Current->Resources->HasKey(L"TitleTextStyle"))
			{
				auto style = safe_cast<Windows::UI::Xaml::Style^>(App::Current->Resources->Lookup("TitleTextStyle"));
				//auto style = safe_cast<Windows::UI::Xaml::Style^>(App::Application::Current->Resources->Lookup(L"TitleTextStyle"));
				if(style != nullptr)
				textBox->Style = style;
// style is not null				
			}

The exception is here:

---

Dino Wu

Answer 1

Hi Dino,

I assume you are using TitleTextStyle from StandardStyles.xaml. That style applies to a TextBlock, not to a TextBox. Your code will succeed if you use an appropriate style for the control.

--Rob

Answer 2

Hi Rob,

Thanks for your reply. You'are right, the TargetType of TitleTextStyle is applied to TextBlock. I'v got it missed.

By the way, how should I check the real cause by exception? This issue raised an E_NETWORK_ERROR, so it confuses me that this condition is caused by a bad net work behavior.

Thanks again!

---

Dino Wu