C# 解析xml串节点值

例如xml串：<?xml version="1.0" encoding="UTF-16" standalone="yes"?>
<root version="1.00.0965"><state success="true"></state><detailreprintflag>0</detailreprintflag></root>
想获取success值为true或者false
代码如下：
string str = "<?xml version=\"1.0\" encoding=\"UTF - 16\" standalone=\"yes\"?><root version =\"1.00.0965\" ><state success =\"false\" ><error no =\"9014\" info =\"输入数据不能为空\" ></error ></state ></root >";      
  XmlDocument doc = new XmlDocument();
            doc.LoadXml(str);
            XmlNode node = doc.SelectSingleNode("//root");
            if (node != null)
            {
                int pos = 0;
                XmlNodeList itmes = node.ChildNodes;
                foreach (XmlNode xn in itmes)
                {
                        string drawType = xn.Attributes["success"].Value;//获取success节点值

} }