从c#/xpath获取属性值。

I have an app.config file, and need to get value of an attribute:

我有一个app.config文件，需要获取属性值:

<param name="File" value="C:\"/>

Liquid XML Studio gives the following xml:

Liquid XML Studio提供了以下XML:

/configuration/log4net/appender/param[1]

However, what C# code can use xpath to get a value?

但是，什么c#代码可以使用xpath来获取值?

4 个解决方案

#1

Use this XPath:

使用这个XPath:

/configuration/log4net/appender/param[@name='File']/@value

Depending on how you read the XML, using the XPath may differ a bit. If you're using XDocument, you can use the XPathSelectElement extension method. If you're using XmlDocument, there is a SelectSingleNode method. And if you use an XPathDocument, you need to compile a XPathExpression and the use this against a navigator.

根据您如何读取XML，使用XPath可能略有不同。如果使用XDocument，可以使用XPathSelectElement扩展方法。如果使用XmlDocument，则有一个SelectSingleNode方法。如果使用XPathDocument，则需要编译XPathExpression并将其用于导航器。

#2

You can use XmlDocument. See XmlNode.SelectSingleNode and others.

您可以使用XmlDocument。看到XmlNode。SelectSingleNode等等。

Example:

例子:

XmlDocument doc = new XmlDocument();
doc.LoadXml(@"<configuration>
<log4net>
<appender>
<param name=""File"" value=""C:\""/>
</appender>
</log4net>
</configuration>");

var node = doc.DocumentElement.SelectSingleNode("//param[@name = 'File']/@value");

Console.WriteLine(node.Value);

#3

It like ....

就像....

        var result = XDocument.Load("test.xml").Descendants("param");

        foreach (var p in result)
        {
            Console.WriteLine(p.Attribute("name"));
        }

        Console.Read();

#4

You can use XmlDocument and a method SelectSingleNode - http://msdn.microsoft.com/en-us/library/fb63z0tw.aspx
It will find a node matching your XPath.

您可以使用XmlDocument和一个方法SelectSingleNode—http://msdn.microsoft.com/en-us/library/fb63z0tw.aspx，它将找到与XPath匹配的节点。

I would do this with LINQ to XML (not with XPath)

我将使用LINQ到XML(而不是XPath)

#1