C# XML 读取子节点
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XML reading child nodes
提问by Ben
I have an XML document and I am trying to get the childnodes of an element called Unit
我有一个 XML 文档，我正在尝试获取名为的元素的子节点 Unit
My XML Doc is layed out like so:
我的 XML 文档布局如下：
<Unit>
<id>3</id>
<name>System Information</name>
<description>null</description>
... other ...
</Unit>
This is the code I am using to try and read them.
这是我用来尝试阅读它们的代码。
public void Load()
{
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
XmlDocument xmldoc = new XmlDocument();
XmlNodeList xmlnode;
xmldoc.Load(fs);
xmlnode = xmldoc.GetElementsByTagName("Units");
for (int i = 0; i < xmlnode.Count; i++)
{
string str = string.Format("ID: {0}\r\nName:{0}", xmlnode[i].ChildNodes.Item(0).InnerText, xmlnode[i].ChildNodes.Item(1).InnerText);
MessageBox.Show(str);
}
}
But the problem is, when I try and get them, instead of getting item 0 or item 1, it displays all the items and not the items i have selected.
但问题是，当我尝试获取它们时，它不是获取项目 0 或项目 1，而是显示所有项目，而不是我选择的项目。
采纳答案by Maris
As I can see from your xml and code. You have error in line:
正如我从您的 xml 和代码中看到的那样。你有错误：
xmlnode = xmldoc.GetElementsByTagName("Units");
change it on:
改变它：
xmlnode = xmldoc.GetElementsByTagName("Unit");
回答by MarcinJuraszek
You have a typo in element name: should be Unitinstead of Units.
您在元素名称中有一个拼写错误：应该是Unit而不是Units。
However, have you tried using LINQ to XML instead of XmlDocument?
但是，您是否尝试过使用 LINQ to XML 而不是XmlDocument？
public void Load()
{
var doc = XDocument.Load(filePath);
foreach(var unit in doc.Descendants("Unit"))
{
string str = string.Format("ID: {0}\r\nName:{0}", unit.Element("id").Value, unit.Element("name").Value);
MessageBox.Show(str);
}
}
回答by Sergey Berezovskiy
With Linq to Xml you can easily parse your xml into (anonymous) strongly typed objects:
使用 Linq to Xml，您可以轻松地将 xml 解析为（匿名）强类型对象：
public void Load()
{
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
var xdoc = XDocument.Load(fs);
var units = from u in xdoc.Descendants("Unit")
select new {
Id = (int)u.Element("id"),
Name = (string)u.Element("name")
};
foreach(var unit in units)
{
// thanks God for IntelliSense!
MessageBox.Show(String.Format("ID:{0}\r\nName:{1}", unit.Id, unit.Name));
}
}
Well, actually if you only need to show those values in message box, you can even write all code in one line. But I prefer first approach, when retrieving data and displaying them are separated (ideally in separate methods):
好吧，实际上如果您只需要在消息框中显示这些值，您甚至可以将所有代码写在一行中。但我更喜欢第一种方法，在检索数据和显示它们时是分开的（最好在单独的方法中）：
XDocument.Load(filePath)
.Descendants("Unit")
.Select(u => String.Format("Id:{0}\nName:{1}", (int)u.Element("id"), (string)u.Element("name"))
.ToList()
.ForEach(MessageBox.Show);
