Question

我正在尝试使用XDocument中的Xelement和C#来获取xml数据。我正在使用IEnumerable<XElement>遍历要提取的所有元素。我的问题是，IEnumerable<XElement>多次获取相同的数据，当我使用foreach循环时，它循环的次数超过了xml文件中元素的数量。在每个循环中都提取相同的东西。有什么建议吗？

我的XML文件：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<SYSTEM SelectedConfiguration = "5840-0000-0001">
  <Configuration Name = "5840-0000-0001">
     <Users>
        <User>
          <Name>Lebron</Name>
          <Surname>James</Surname>
          <Adress>asdfgh</Adress>
          <Phone>1234</Phone>
          <Gender>Male</Gender>
          <Country>USA</Country>
        </User>
        <User>
          <Name>Kevin</Name>
          <Surname>Durand</Surname>
          <Adress>asdfghasdfgh</Adress>
          <Phone>4567</Phone>
          <Gender>Male</Gender>
          <Country>USA</Country>
        </User>
        <User>
          <Name>Stephen</Name>
          <Surname>Curry</Surname>
          <Adress>zxcv</Adress>
          <Phone>1267</Phone>
          <Gender>Male</Gender>
          <Country>USA</Country>
        </User>
    </Users>
  </Configuration>  
</SYSTEM>

我的代码：

 XDocument devices = XDocument.Load(Application.StartupPath + "\\Users.xml");
                    XElement conf = devices.Root.Element("Configuration");

                  /*
                    IEnumerable<XElement> childElements =
                        from el in conf.Element("Instruments").Elements("Instrument")
                        select el;
                   */
                    IEnumerable<XElement> childElements = conf.Element("Users").Elements("User");
                    int counter = childElements.Count();
                    foreach (XElement el in childElements)
                    {


                            DataGridViewRow row = (DataGridViewRow)dataGridView1.Rows[0].Clone();
                            row.Cells[0].Value = el.Element("Name").Value.ToString();
                            row.Cells[1].Value = el.Element("Surname").Value.ToString();
                            row.Cells[2].Value = el.Element("Adress").Value.ToString();

                            dataGridView1.Rows.Add(row);
                           // if (counter-- <= 1)
                               // return;
                    }

我得到的结果：

Click here to see the image

Click here to see the image 2

Click here to see the image 3

如图像所示，有多个Lebron James或Kevin Durand，foreach遍历这些节点的每种组合，如图3所示。

编辑1：

程序多次循环回到IEnumerable<XElement> childElements = conf.Element("Users").Elements("User");行。计数器一次又一次得到3。

Answer 1

这对我有用，请看一下。

W/System.err: java.lang.RuntimeException: Stub!
        at com.google.android.things.pio.PeripheralManager.getInstance(PeripheralManager.java:21)
        at com.eurotronik.library.common.serial.SerialClass.<init>(SerialClass.java:38)
        at com.eurotronik.nursetabmode.serialport.SerialPortService.onCreate(SerialPortService.java:112)
        at android.app.ActivityThread.handleCreateService(ActivityThread.java:3192)
        at android.app.ActivityThread.-wrap5(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1568)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:154)
        at android.app.ActivityThread.main(ActivityThread.java:6121)
        at java.lang.reflect.Method.invoke(Native Method)

IEnumerable <XElement>多次获取同一元素

1 个答案: