下面同一操作的两种方法哪种你比较喜欢？或者认为更好其它方法？

--- 1 ---

do
{
if ( ((TCppWebBrowser*)Sender)->Document == NULL )
break;

if ((TCppWebBrowser*)Sender)->Document->QueryInterface(IID_IHTMLDocument2, (void**)&pDocument) != S_OK )
break;

pDocument->get_body(&pElement);
if ( pElement == NULL )
break;

pElement->get_style(&pStyle);
if ( pStyle == NULL )
break;

pStyle->put_borderStyle(L"none");
} while(false);

--- 2 ---

if (((TCppWebBrowser*)Sender)->Document != NULL &&
((TCppWebBrowser*)Sender)->Document->QueryInterface(IID_IHTMLDocument2, (void**)&pDocument) == S_OK )
{
pDocument->get_body(&pElement);

if ( pElement != NULL )
{
pElement->get_style(&pStyle);
if ( pStyle != NULL )
{
pStyle->put_borderStyle(L"none");
}
}
}