如何从XML文件中使用C＃删除节点 [英] How to delete node from XML file using C#

问题描述

可能重复：

的如何从XmlNodeList中

我怎么能删除删除一个XmlNode从XML文件的一组节点。？
下面的代码片段

Hi, How can i delete a set of nodes from an XML file.? Here is a code snippet.

string path = @"C:\Documents and Settings\e454935\Desktop\NUnitSettings.xml";
FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
System.Xml.XmlDocument xmldoc = new System.Xml.XmlDocument();
xmldoc.Load(fs);
fs.Close();
xmldoc.DocumentElement.RemoveChild(xmldoc.DocumentElement.ChildNodes[1]);
FileStream WRITER = new FileStream(path, FileMode.Truncate, FileAccess.Write, FileShare.ReadWrite);
xmldoc.Save(WRITER);
WRITER.Close();

我尝试下面的代码只删除一个节点，并得到了
对象未设置为一个对象的一个​​实例。在

I tried the following code simply to delete a node and got "Object reference not set to an instance of an object." at

xmldoc.DocumentElement.RemoveChild(xmldoc.DocumentElement.ChildNodes[1]);

下面是一个简单的XML文件，

Here is a sample XML file,

<?xml version="1.0"?>
<Xml1>
  <Settings>
    <Setting name="DisplayFormat" value="Full" />
    <Setting name="File1" value="a" />
    <Setting name="File1" value="b" />
    <Setting name="File1" value="c" />
    <Setting name="File1" value="d" />
  </Settings>
</Xml1>

其实从这个文件我想删除四个文件1节点有值A，b，C，D，然后我想添加节点

Actually from this file i want to delete the Four File1 nodes which has the values "a,b,c,d" and then i want to add a node,

<Setting name="File1" value="e" />

我怎样才能做到这一点？

How can i do this.?

推荐答案

这可能是更容易使用XPath找到要删除的节点。 这个计算器线程可能会给你一些想法。

It may be easier to use XPath to locate the nodes that you wish to delete. This stackoverflow thread might give you some ideas.

在你的情况，你会发现，你想用这种表达的四个节点：

In your case you will find the four nodes that you want using this expression:

XmlDocument doc = new XmlDocument();
doc.Load(fileName);
XmlNodeList nodes = doc.SelectNodes("//Setting[@name='File1']");

这篇关于如何从XML文件中使用C＃删除节点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！