不确定如何在C#中使用XmlNode

本文关键字:XmlNode 不确定 | 更新日期: 2023-09-27 18:26:25

在C#中,我需要使用XmlNode从以下属性中获取值:

根元素(ServerConfig):

  • 版本

  • 创建日期

子节点(项):

  • 名称

  • 目的地

XML:

<?xml version="1.0" encoding="utf-8"?>
<ServerConfig type="ProjectName" version ="1.1.1.2" createDate ="2013-07-30T15:07:19.3859287+02:00" >
<items>
    <item  name="fs" type="directory" source="C:'temp'source" destination="C:'temp'target" action="Create" />
    <item  name="testdoc.txt" type="file" source="C:'temp'source" destination="C:'temp'target" action="Update" />
</items>
</ServerConfig>

C#:

        XmlTextReader reader = new XmlTextReader(fileManager.ConfigFile);
        XmlDocument doc = new XmlDocument();
        XmlNode node = doc.ReadNode(reader);
        // failed to get values here
        var Version = node.Attributes["version"].Value;
        var Type = node.Attributes["type"].Value;
        var Date = node.Attributes["createDate"].Value;
        //how to get values from items/item attributes here?

非常感谢您的示例代码:)

不确定如何在C#中使用XmlNode

您可以使用LINQ to XML(在最新的.Net版本中更可取)

var xdoc = XDocument.Load(fileManager.ConfigFile);
var serverConfig = xdoc.Root;
string version = (string)serverConfig.Attribute("version");
DateTime date = (DateTime)serverConfig.Attribute("createDate");
string type = (string)serverConfig.Attribute("type");
var items = from item in serverConfig.Element("items").Elements()
            select new {
                Name = (string)item.Attribute("name"),
                Type = (string)item.Attribute("type"),
                Source = (string)item.Attribute("source"),
                Destination = (string)item.Attribute("destination")
            };

看一看——几行代码和文件被解析为强类型变量。即使date也是DateTime对象,而不是字符串。是匿名对象的集合,其属性与xml属性相对应。

您可以使用XmlSerializer:

类别:

public class ServerConfig
{
    public ServerConfig()
    {
        Items = new List<Item>();
    }
    [XmlAttribute("type")]
    public string Type { get; set; }
    [XmlAttribute("version")]
    public string Version { get; set; }
    [XmlAttribute("createDate")]
    public DateTime CreateDate { get; set; }
    [XmlArray("items")]
    [XmlArrayItem("item")]
    public List<Item> Items { get; set; }
}
public class Item
{
    [XmlAttribute("name")]
    public string Name { get; set; }
    [XmlAttribute("type")]
    public string Type { get; set; }
    [XmlAttribute("source")]
    public string Source { get; set; }
    [XmlAttribute("destination")]
    public string Destination { get; set; }
    [XmlAttribute("action")]
    public string Action { get; set; }
}

示例:

var data = @"<?xml version=""1.0"" encoding=""utf-8""?>
    <ServerConfig type=""ProjectName"" version =""1.1.1.2"" createDate =""2013-07-30T15:07:19.3859287+02:00"" >
    <items>
        <item  name=""fs"" type=""directory"" source=""C:'temp'source"" destination=""C:'temp'target"" action=""Create"" />
        <item  name=""testdoc.txt"" type=""file"" source=""C:'temp'source"" destination=""C:'temp'target"" action=""Update"" />
    </items>
    </ServerConfig>";
var serializer = new XmlSerializer(typeof(ServerConfig));
ServerConfig config;
using(var stream = new StringReader(data))
using(var reader = XmlReader.Create(stream))
{
    config = (ServerConfig)serializer.Deserialize(reader);
}

您应该使用XPath来获取项并对结果进行循环;)

类似这样的东西:

foreach (XmlNode item in doc.DocumentElement.SelectNodes("items/item"))
{
  var Name = item.Attributes["name"].Value;
  var Source= item.Attributes["source"].Value;
  var Destination = item.Attributes["destination"].Value;
} 

要获取根元素,可以使用doc.DocumentElement;)

加载您的文档:

XmlDocument doc = new XmlDocument();
doc.Load(fileManager.ConfigFile);

然后您将能够使用XPath:选择任何内容

doc.SelectSingleNode(XPath); 
doc.SelectNodes(XPath);

我不使用XmlNode,而是使用XmlElement,因为它有一个名为GetAttribute(string attributeName)的好方法,它比XmlNode上的Attributes索引器属性更容易使用。而且,由于XmlElement派生自XmlNode,因此在保留基本XmlNode类的功能的同时,您可以获得添加的功能。。

var items = doc.DocumentElement.SelectNodes("items/item").Cast<XmlElement>().ToList();
// You can iterate over the list, here's how you'd get your attributes:
var Name = items[0].GetAttribute("name"); // Returns null if attribute doesn't exist, doesn't throw exception
var Source = items[0].GetAttribute("source");
var Destination = items[0].GetAttrubite("destination");

HTH。