blocks|key|1633777|text|有多种方法可以做到这一点--这是使用XmlDocument，它适用于XML1.x及更高版本，只要.NET文档不太长，就可以很好地工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1633778|//+create+new+XmlDocument+and+load+file
XmlDocument+xdoc+=+new+XmlDocument();
xdoc.Load("YourFileName.xml");

//+find+a+<User>+node+with+attribute+ID=2
XmlNode+userNo2+=+xdoc.SelectSingleNode("//User[@ID='2']");

//+if+found,+begin+manipulation++++
if(userNo2+!=+null)
{
+++//+find+the+<password>+node+for+the+user
+++XmlNode+password+=+userNo2.SelectSingleNode("password");
+++if(password+!=+null)
+++{
++++++//+change+contents+for+<password>+node+
++++++password.InnerText+=+"somthing+that+is+different+than+before";
+++}

+++//+find+the+<host>+node+for+the+user
+++XmlNode+hostNode+=+userNo2.SelectSingleNode("host");
+++if(hostNode+!=+null)
+++{
++++++//+change+contents+for+<host>+node+
++++++hostNode.InnerText+=+"the+most+current+host+that+they+were+seen+as";
+++}

+++//+save+changes+to+a+new+file+(or+the+old+one+-+up+to+you)
+++xdoc.Save("YourFileNameNew.xml");
}|code-block|syntax|javascript|1633779|如果您使用的是XML3.5或更高版本，那么您还可以使用Linq-+to+-+.NET来使用一种更简单的方法来操作您的XML文档。|1633780|Marc|1633781|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

There are multiple ways you could do this - this is with an XmlDocument, which works in .NET 1.x and up, and works fine as long as your XML document isn't too long:

<pre><code>// create new XmlDocument and load file
XmlDocument xdoc = new XmlDocument();
xdoc.Load("YourFileName.xml");

// find a &lt;User&gt; node with attribute ID=2
XmlNode userNo2 = xdoc.SelectSingleNode("//User[@ID='2']");

// if found, begin manipulation 
if(userNo2 != null)
{
 // find the &lt;password&gt; node for the user
 XmlNode password = userNo2.SelectSingleNode("password");
 if(password != null)
 {
 // change contents for &lt;password&gt; node 
 password.InnerText = "somthing that is different than before";
 }

 // find the &lt;host&gt; node for the user
 XmlNode hostNode = userNo2.SelectSingleNode("host");
 if(hostNode != null)
 {
 // change contents for &lt;host&gt; node 
 hostNode.InnerText = "the most current host that they were seen as";
 }

 // save changes to a new file (or the old one - up to you)
 xdoc.Save("YourFileNameNew.xml");
}
</code></pre>

If you're using .NET 3.5 and up, you could also check into Linq-to-XML for a probably even easier way to manipulate your XML document.

Marc

blocks|key|227343|text|看看这个问题，应该可以使用Linq-to-XML得到答案。这涉及到写到控制台窗口，但原理是相同的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227344|Linq+to+XML+-+update/alter+the+nodes+of+an+XML+Document|offset|length|227345|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/331502/linq-to-xml-update-alter-the-nodes-of-an-xml-document^0|0|0|1J|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

Check out this question, should have your answer using Linq-to-XML. This involves writing out to a Console window, but the theory is the same.

<a href="https://stackoverflow.com/questions/331502/linq-to-xml-update-alter-the-nodes-of-an-xml-document">Linq to XML - update/alter the nodes of an XML Document</a>

blocks|key|227448|text|您可以使用XmlDocument来执行以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|227449|var+doc+=+new+XmlDocument();
doc.Load("1.xml");
var+node+=+doc.SelectSingleNode(@"//User[@ID='2']");
node.SelectSingleNode("password").InnerText="terces";
doc.Save("1.xml");|code-block|syntax|javascript|227450|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You may use XmlDocument for this:

<pre><code>var doc = new XmlDocument();
doc.Load("1.xml");
var node = doc.SelectSingleNode(@"//User[@ID='2']");
node.SelectSingleNode("password").InnerText="terces";
doc.Save("1.xml");
</code></pre>

ok, so, i have an xml file that looks like this:

<pre><code>&lt;?xml version="1.0"?&gt;
&lt;Users&gt;
 &lt;User ID="1"&gt;
 &lt;nickname&gt;Tom&lt;/nickname&gt;
 &lt;password&gt;a password&lt;/password&gt;
 &lt;host&gt;anemail@hello.com&lt;/host&gt;
 &lt;email&gt;anemail&lt;/email&gt;
 &lt;isloggedin&gt;false&lt;/isloggedin&gt;
 &lt;permission&gt;10&lt;/permission&gt;
 &lt;/User&gt;
 &lt;User ID="2"&gt;
 &lt;nickname&gt;ohai&lt;/nickname&gt;
 &lt;password&gt;sercret&lt;/password&gt;
 &lt;host&gt;my@host&lt;/host&gt;
 &lt;email&gt;my@email&lt;/email&gt;
 &lt;isloggedin&gt;false&lt;/isloggedin&gt;
 &lt;permission&gt;1&lt;/permission&gt;
 &lt;/User&gt;
&lt;Users&gt;
</code></pre>

now, first, i will have a return of what their ID number is, so, ill have "2". 
from that, i will need to go into, and edit the fields in it, and resave the xml. 
so basically what i need, is to open the file, find the info for User ID="2", and resave the xml, with DIFFERENT values inside of user 2, without affecting the rest of the document.

examlpe:

<pre><code> &lt;User ID="2"&gt;
 &lt;nickname&gt;ohai&lt;/nickname&gt;
 &lt;password&gt;sercret&lt;/password&gt;
 &lt;host&gt;my@host&lt;/host&gt;
 &lt;email&gt;my@email&lt;/email&gt;
 &lt;isloggedin&gt;false&lt;/isloggedin&gt;
 &lt;permission&gt;1&lt;/permission&gt;
 &lt;/User&gt;
</code></pre>

//do the alterations here, and end up with

<pre><code> &lt;User ID="2"&gt;
 &lt;nickname&gt;ohai&lt;/nickname&gt;
 &lt;password&gt;somthing that is different than before&lt;/password&gt;
 &lt;host&gt;the most current host that they were seen as&lt;/host&gt;
 &lt;email&gt;my@email&lt;/email&gt;
 &lt;isloggedin&gt;false&lt;/isloggedin&gt;
 &lt;permission&gt;1&lt;/permission&gt;
 &lt;/User&gt;
</code></pre>

etc.

Summary:
i need to open a text file, return the information via ID number, edit the information, re-save the file. without affecting anything other than user 2

~Thanks!

XML field replacement in C#

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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好的，我有一个如下所示的xml文件：<?xml version="1.0"?><Users> <User ID="1"> <nickname>Tom</nickname> <password>a password</password> <host>anemail@hello.com</host> ...

问C#中的XML字段替换
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