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C#Foreach XML节点

更新时间:2023-11-24 16:14:04

您可能想要检查Linq- -XML:

  XDocument coordinates = XDocument.Load(yourfilename.xml); 
$ b foreach(坐标中的坐标.Descendants(坐标))
{
string time = coordinate.Attribute(time)。Value;

字符串初始值= coordinate.Element(initial)。Value;
string final = coordinate.Element(final)。Value;

//对这些信息做任何你想做的事情现在

$ / code $ / pre

这应该比使用直接的低级别XmlTextReader更容易......

请参阅 here 这里(或许多其他地方)介绍Linq-to-XML。




更新:

请尝试此代码 - ,然后你得到结果列表中的所有坐标,那么Linq-to-XML代码就可以了:



定义一个新的helper类:

  public class Coordinate 
{
public string Time {get;组; }
public string Initial {get;组; }
public string Final {get;组; }
}

以及您的主要代码:

  XDocument xdoc = XDocument.Load(C:\\test.xml); 
IEnumerable< XElement> cords = xdoc.Descendants(coordinate);

var coordinate = cords
.Select(x => new Coordinate()
{
Time = x.Attribute(time)。Value,
Initial = x.Attribute(initial)。Value,
Final = x.Attribute(final)。Value
});

这份清单及其内容如何?你会得到你期望的所有坐标吗?


I'm saving 2-dimensional coordinates on an XML file with a structure similar to:

<?xml version="1.0" encoding="utf-8" ?> 
<grid>
<coordinate time="78">
<initial>540:672</initial> 
<final>540:672</final> 
</coordinate>
</grid>

I can open the XML file and read it via the XmlTextReader, but how do I loop through the coordinates specifically to retrieve both the time attribute and data between the initial and final nodes in some format similar to:

string initial = "540:672";
string final  = "540:672";
int time = 78;


New Code:

My New Code:

//Read the XML file.
XDocument xmlDoc = XDocument.Load("C:\\test.xml");

foreach (var coordinate in xmlDoc.Descendants("coordinate"))
{
    this.coordinates[this.counter][0] = coordinate.Attribute("time").Value;
    this.coordinates[this.counter][1] = coordinate.Element("initial").Value;
    this.coordinates[this.counter][2] = coordinate.Element("final").Value;
    this.counter++;
};

but now I get this error:
"Object reference not set to an instance of an object."


XML

<?xml version="1.0" encoding="utf-8"?>
<grid>
  <coordinate time="62">
    <initial>540:672</initial>
    <final>540:672</final>
  </coordinate>

  ...

  <coordinate time="46">
    <initial>176:605</initial>
    <final>181:617</final>
  </coordinate>
</grid>

Skipped a few coordinate tags to fit, but they all had the time attribute and initial/final subtags.


Globals

uint counter = 0;

        // Coordinates to be retrieved from the XML file.
        string[][] coordinates;

You might want to check into something like Linq-to-XML:

XDocument coordinates = XDocument.Load("yourfilename.xml");

foreach(var coordinate in coordinates.Descendants("coordinate"))
{
    string time = coordinate.Attribute("time").Value;

    string initial = coordinate.Element("initial").Value;
    string final = coordinate.Element("final").Value;

    // do whatever you want to do with those items of information now
}

That should be a lot easier than using straight low-level XmlTextReader....

See here or here (or a great many other places) for introductions to Linq-to-XML.


UPDATE:

please try this code - if it works, and you get all the coordinates in that resulting list, then the Linq-to-XML code is fine:

Define a new helper class:

public class Coordinate
{
    public string Time { get; set; }
    public string Initial { get; set; }
    public string Final { get; set; }
}

and in your main code:

XDocument xdoc = XDocument.Load("C:\\test.xml");
IEnumerable<XElement> cords= xdoc.Descendants("coordinate");

var coordinates = cords
                  .Select(x => new Coordinate()
                                   {
                                      Time = x.Attribute("time").Value,
                                      Initial = x.Attribute("initial").Value,
                                      Final = x.Attribute("final").Value
                                    });

How does this list and its contents look like?? Do you get all the coordinates you're expecting??