在网上抓取的一个个字符串
string str = "<a href="javascript:void(0);" onclick="HotelRoom.onNameClick(this)" class="pic"><img onerror="errorRoomImg(this)" _src="http://images4.c-ctrip.com/target/hotel/134000/133552/311E8632-8D98-4266-81C2-05FB988A4AF5_300_225.jpg" src="http://images4.c-ctrip.com/target/hotel/134000/133552/311E8632-8D98-4266-81C2-05FB988A4AF5_130_130.jpg"/></a><a class="room_unfold" href="javascript:void(0);" onclick="HotelRoom.onNameClick(this)">大床房B<br /><span>查看详情</span></a> "有什么简单高效的方法能把 大床房B 获取到C#String抓取