隨機選擇具有相同名稱的XML節點

Question

我有這個XML文件：

<Main>
<QA>
    <question>What is your favorite color?</question>
    <!--pick random!-->
    <answer>Blue</answer>
    <answer>Red</answer>
    <answer>Green</answer>
    <answer>Yellow</answer>
</QA>

<QA>
    <question>What is your favorite programming language?</question>
    <!--pick random!-->
    <answer>PHP</answer>
    <answer>C#</answer>
    <answer>Java</answer>
    <answer>VB.Net</answer>
</QA>

我想當用戶輸入上面xml文件中指定的問題之一時，程序從節點中選擇一個隨機的答案。 例如，當用戶輸入“您最喜歡的編程語言是什么？”時 在TextBox中，程序必須隨機生成PHP，C＃，Java或VB.Net。

這是我的代碼，但不正確：

XmlDocument xml = new XmlDocument();
xml.Load("QA.xml");

XmlNodeList xList = xml.SelectNodes("Main/QA");
foreach (XmlNode xn in xList)
{
    string Question = xn["question"].InnerText;
    if (Question == txtQuestion.Text)
    {
        XmlNodeList answerlist = xml.SelectNodes("Main/QA/answer");
        foreach (XmlNode ans in answerlist)
        {
            Console.WriteLine(ans.InnerText);
        }
    }
}  

輸出：

藍紅綠黃PHP C＃Java VB.Net

請幫忙。

Answer 1

使用Linq To Xml，

Random rnd = new Random();
var xDoc = XDocument.Load("QA.xml");

var question = xDoc.Descendants("QA")
                   .First(d => d.Element("question").Value == txtQ.Text);

var answer = question.Elements()
                     .Skip(rnd.Next(0, question.Elements().Count()))
                     .First().Value;

Answer 2

嘗試這個：

XmlDocument xml = new XmlDocument();
xml.Load("QA.xml");

XmlNodeList xList = xml.SelectNodes("Main/QA");
foreach (XmlNode xn in xList)
{
    string Question = xn["question"].InnerText;
    if (Question == txtQuestion.Text)
    {
        XmlNodeList answerlist = xn.SelectNodes("./answer");
        foreach (XmlNode ans in answerlist
            .Cast<XmlNode>()
            .OrderBy(elem => Guid.NewGuid()))
        {
            Console.WriteLine(ans.InnerText);
        }
    }
}