读取特定的XML参数 [英] Reading specific XML parameter

问题描述

我目前正在从事一个项目，该项目必须读取xml文件以进行程序设置.

I'm currently working on a project in which a xml file must be read for program settings.

XML看起来像这样:

The XML looks like this:

<?xml version="1.0" encoding="utf-8"?>
<!-- Settings for Modul1 -->
<root>
 <Program-Config>
  <Parameter>Name</Parameter>
  <Value>John</Value>
 </Program-Config>

 <Program-Config>
  <Parameter>Device</Parameter>
  <Value>TV</Value>
 </Program-Config>
.
.
.
</root>

此结构还用于填充数据网格视图，如下所示:

This structure is also used to fill a datagridview like this:

Parameter | Value
__________|______
Name      | John
Device    | TV

这可以正常工作，我可以将所做的更改保存到xml文件中.

This is working and I can save the changes I make to a xml file.

但是我的问题是我需要读取xml文件的特定元素，但是它不能很好地工作.

However my problem is that I need to read out a specific element of the xml file and yet it is not working so good.

我的代码:

        string dir;
        dir = Directory.GetCurrentDirectory() + "\\config.xml";

        XDocument xDoc = XDocument.Load(dir);
        var xmlStr = File.ReadAllText(dir);

        var str = XElement.Parse(xmlStr);
        var result = str.Elements("Program-Config").
            Where(x => x.Element("Parameter").Value.Equals("Device")).ToList();


        for (int i = 0; i <= result.Count - 1; i++)
        {
            Console.WriteLine(result[i].Value);
        }

但是他在Console中写的是:DeviceTV.但是我需要:电视

But what he writes in Console is: DeviceTV . But I need: TV

然后将该值用作程序的其他部分的字符串/整数.

This is then used as string / int whatever for other parts of the program.

有人可以帮我吗?

推荐答案

Value属性返回其子节点的串联文本. result[i]返回的元素是Parameter元素，但是您只希望其子元素Value.

The Value property returns the concatenated text of its child nodes. The element returned by result[i] is a Parameter element, but you want its child Value element only.

var value = (string) str.Elements("Program-Config")
    .Where(x => (string) x.Element("Parameter") == "Device")
    .Elements("Value")
    .Single();

目前尚不清楚为什么要执行XDocument.Load并将其丢弃.您可以通过稍微调整查询来使用该文档:

It's not clear why you're doing XDocument.Load and throwing this away. You could use the document by tweaking your query slightly:

var value = (string) xDoc.Descendants("Program-Config")
    .Where(x => (string) x.Element("Parameter") == "Device")
    .Elements("Value")
    .Single();

有关工作示例，请参见此小提琴.

See this fiddle for a working demo.

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