c# - 在 C# 中创建简单的 Xml

Question

我需要帮助打印一些 xml。这是我的代码(它不工作它甚至不正确格式化完整的 url，它不理解 url 字符串中的“//”)它也不理解“<”。一定有更好的方法来做到这一点？？

 foreach (string url in theUrls)
         {
             fullurl=@"http://www.cambit.com/restaurants" +url;
             xml = xml + @"<url>" + Environment.NewLine +
                       @"<loc>" + fullurl + @"</loc>" + Environment.NewLine +
                       @"<changefreq>weekly</changefreq>" + Environment.NewLine +
                       @"<priority>0.80</priority>" + Environment.NewLine +
                       @"</url>" + Environment.NewLine;    

        }

它返回 400 个彼此紧挨着的附加项。 Environment.NewLine 也不起作用....

http://www.cambit.com/restaurantsBerwyn weekly 0.80

我试过了，它说 loc 对象没有设置为对象的实例

 XmlDocument aNewNode = new XmlDocument();
 XmlElement urlRoot = aNewNode.CreateElement("url");
 //aNewNode.DocumentElement.AppendChild(urlRoot);
 XmlElement loc = aNewNode.CreateElement("loc");
 XmlText locText = aNewNode.CreateTextNode(fullurl);
 aNewNode.DocumentElement.AppendChild(loc);
 aNewNode.DocumentElement.LastChild.AppendChild(locText);
 XmlElement chgFreq = aNewNode.CreateElement("changefreq");
 XmlText chgFreqText = aNewNode.CreateTextNode("weekly");
 aNewNode.DocumentElement.AppendChild(chgFreq);
 aNewNode.DocumentElement.LastChild.AppendChild(chgFreqText);
 XmlElement priority = aNewNode.CreateElement("priority");
 XmlText priorityText = aNewNode.CreateTextNode("0.80");
 aNewNode.DocumentElement.AppendChild(priority);
 aNewNode.DocumentElement.LastChild.AppendChild(priorityText);

哪里做错了？？

Answer 1

最简单的方法之一是使用 XDocument，它有 lots of documentation .这是文档中的示例:

XDocument srcTree = new XDocument(
    new XComment("This is a comment"),
    new XElement("Root",
        new XElement("Child1", "data1"),
        new XElement("Child2", "data2"),
        new XElement("Child3", "data3"),
        new XElement("Child2", "data4"),
        new XElement("Info5", "info5"),
        new XElement("Info6", "info6"),
        new XElement("Info7", "info7"),
        new XElement("Info8", "info8")
    )
);

XDocument doc = new XDocument(
    new XComment("This is a comment"),
    new XElement("Root",
        from el in srcTree.Element("Root").Elements()
        where ((string)el).StartsWith("data")
        select el
    )
);

Console.WriteLine(doc);

这适用于您的示例的方式类似于:

public XDocument CreateDocument(IEnumerable<string> theUrls)
{
    var urlElements = theUrls.Select(u => CreateUrlElement(u));
    return new XDocument(new XElement("Urls", urlElements));
}

public XElement CreateUrlElement(string url)
{
    return new XElement("Url",
        new XElement("loc", fullUrl),
        ... the rest of your elements ...);
}