求救，关于XML里面元素的提取，用C#
这个是我的XML文件代码：

<?xml version="1.0" encoding="utf-8"?>
<ConversationTransitions>
<Transition>
<SourceInteraction href="OP1"/>
</Transition>
<Transition>
<SourceInteraction href="OP2"/>
</Transition>
<Transition>
<SourceInteraction href="OP3"/>
</Transition>
<Transition>
<SourceInteraction href="OP4"/>
</Transition>
</ConversationTransitions>

我想把OP1,OP2,OP3,OP4都取出来，这个该怎么样操作啊？ 谢谢了啊，我想要具体的代码。

[解决办法]

C# code

public void MainOption()    {        string xmlFilePath = @"xmlfilePath.xml"; //filePath        List<string> opList = new List<string>();        opList = GetOPValues(xmlFilePath);    }    private List<string> GetOPValues(string xmlFilePath)    {        List<string> opList = new List<string>();        XmlDocument xmlDoc = new XmlDocument();        xmlDoc.Load(xmlFilePath);        XmlElement xmlRoot = xmlDoc.DocumentElement;        XmlNodeList nodeList = xmlDoc.SelectNodes("ConversationTransitions/Transition/SourceInteraction");        foreach (XmlNode node in nodeList)        {            opList.Add(node.Attributes["href"].Value);        }        return opList;    }