使用 SelectSingleNode 读取 XML

本文关键字：XML 读取 SelectSingleNode 使用 | 更新日期: 2023-09-27 18:33:34

>我使用以下代码来读取指定的XML

<?xml version='"1.0'" encoding='"UTF-8'"?>
<feed version='"0.3'" xmlns='"http://purl.org/atom/ns#'">
    <title>Gmail - Inbox for xxxx@gmail.com</title>
    <tagline>New messages in your Gmail Inbox</tagline>
    <fullcount>1</fullcount>
    <link rel='"alternate'" href='"https://mail.google.com/mail'" type='"text/html'" />
    <modified>2016-02-07T12:11:21Z</modified>
    <entry>
        <title>Access for less secure apps has been turned on</title>
        <summary>Access for less secure apps has been turned on Hi Buddy, You recently changed your security settings so</summary>
        <link rel='"alternate'" href='"https://mail.google.com/mail?account_id=agl.testauto@gmail.com&amp;message_id=152bb8ccd28d824b&amp;view=conv&amp;extsrc=atom'" type='"text/html'" />
        <modified>2016-02-07T11:45:12Z</modified>
        <issued>2016-02-07T11:45:12Z</issued>
        <id>tag:gmail.google.com,2004:1525516088640373323</id>
        <author>
            <name>Google</name>
            <email>no-reply@accounts.google.com</email>
        </author>
    </entry>
</feed>

正在使用下面的代码，问题是我没有通过最后一行代码获取title元素的值。 

response = Encoding.UTF8.GetString(objclient.DownloadData("https://mail.google.com/mail/feed/atom"));
response = response.Replace("<feed version*'"0.3'" xmlns='"http://purl.org/atom/01#'">", "<feed>");
xdoc.LoadXml(response);
var nsmgr = new XmlNamespaceManager(xdoc.NameTable);
nsmgr.AddNamespace("feed", "http://purl.org/atom/ns#");
node = xdoc.SelectSingleNode("//feed:fullcount", nsmgr);

Variables.emailcount = Convert.ToInt16(node.InnerText);
System.Diagnostics.Debug.Write(Variables.emailcount);
tagline = xdoc.SelectSingleNode("//feed:tagline", nsmgr).InnerText;
node2 = xdoc.SelectSingleNode("//feed:entry", nsmgr);
message_subject = node2.SelectSingleNode("//feed/entry/title", nsmg).InnerText;    ---- >>>  Issue Line

只是想知道问题可能在哪里。

谢谢

使用 SelectSingleNode 读取 XML

试试

message_subject = 节点 2。SelectSingleNode（"//feed：entry/feed：title"， NSMGR）。内部文本;

注意：您已使用"feed"作为命名空间的名称，因此标题也应限定

通过使用从

程序集System.ServiceModel.Syndication命名空间中定义的SyndicationFeed使您的生活更轻松System.ServiceModel。

SyndicationFeed syndicationFeed = null;
using (var reader = XmlReader.Create("https://mail.google.com/mail/feed/atom"))
{
    syndicationFeed = SyndicationFeed.Load(reader);
}
if(syndicationFeed != null)
{
    foreach (SyndicationItem item in syndicationFeed.Items)
    {
        // Do everything you want here by checking properties you need from SyndicationItem item variable.
    }
}

要了解SyndicationItem提供哪些属性，请查看此链接。

我更喜欢 xml linq

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication1
{
    class Program
    {
        const int NUMBER_OF_XML = 3;
        static void Main(string[] args)
        {
            string xml =
                "<?xml version='"1.0'" encoding='"UTF-8'"?>" +
                    "<feed version='"0.3'" xmlns='"http://purl.org/atom/ns#'">" +
                        "<title>Gmail - Inbox for xxxx@gmail.com</title>" +
                        "<tagline>New messages in your Gmail Inbox</tagline>" +
                        "<fullcount>1</fullcount>" +
                        "<link rel='"alternate'" href='"https://mail.google.com/mail'" type='"text/html'" />" +
                        "<modified>2016-02-07T12:11:21Z</modified>" +
                        "<entry>" +
                            "<title>Access for less secure apps has been turned on</title>" +
                            "<summary>Access for less secure apps has been turned on Hi Buddy, You recently changed your security settings so</summary>" +
                            "<link rel='"alternate'" href='"https://mail.google.com/mail?account_id=agl.testauto@gmail.com&amp;message_id=152bb8ccd28d824b&amp;view=conv&amp;extsrc=atom'" type='"text/html'" />" +
                            "<modified>2016-02-07T11:45:12Z</modified>" +
                            "<issued>2016-02-07T11:45:12Z</issued>" +
                            "<id>tag:gmail.google.com,2004:1525516088640373323</id>" +
                            "<author>" +
                                "<name>Google</name>" +
                                "<email>no-reply@accounts.google.com</email>" +
                            "</author>" +
                        "</entry>" +
                    "</feed>";
            XDocument doc = XDocument.Parse(xml);
            XElement firstNode = (XElement)doc.FirstNode;
            XNamespace ns = firstNode.Name.Namespace;
            var results = doc.Elements(ns + "feed").Select(x => new {
                    tagline = (string)x.Element(ns + "tagline"),
                    message_subject = (string)x.Element(ns + "entry").Element(ns + "title")
                }).FirstOrDefault();

        }
    }
}
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