C# xml配置文件的操作

xml文件是配置文件的常用格式，C#中操作常用Linq方式，本文简单介绍其用法。

首先需要包含Linq，

using System.Xml.Linq;

如项目中的xml文件格式如下，

<?xml version="1.0" encoding="utf-8"?>
<channelconfig Company="zkmrobot" Board="usb3210">
  <channel Type="Force" CHSN="F1-01" SN="080401" Name="CH01">
    <x0>0.602</x0>
    <y0>50.00</y0>
    <x1>3.680</x1>
    <y1>300.00</y1>
    <offset>0.00</offset>
  </channel>

</channelconfig>

创建对应的操作类

class ChannelConfig
    {
        private string channelName;

private double x0;
        private double y0;
        private double x1;
        private double y1;
        private double offset;

public ChannelConfig()
        { }

public string ChannelName
        {
            get { return channelName; }
            set { channelName = value; }
        }

public double X0
        {
            get { return x0; }
            set { x0 = value; }
        }

public double Y0
        {
            get { return y0; }
            set { y0 = value; }
        }

public double X1
        {
            get { return x1; }
            set { x1 = value; }
        }

public double Y1
        {
            get { return y1; }
            set { y1 = value; }
        }

public double Offset
        {
            get { return offset; }
            set { offset = value; }
        }
    
    }

通道参数配置界面如下，

仅需要加一个DataGridView控件与两个按钮控件。

DataGridView控件用来显示与操作xml中的文件，中间的桥梁就是上面设计的配置类。

具体动作由两个按钮来完成。代码贴在窗口下面

public partial class Form3 : Form
    {
        List <ChannelConfig> ChannelconfigList = new List<ChannelConfig>();

public Form3()
        {
            InitializeComponent();
        }

private void Form3_Load(object sender, EventArgs e)
        {
            buttonReadAll_Click(sender,e);
            
        }

private void buttonReadAll_Click(object sender, EventArgs e)
        {
            //XmlDocumentReadAll();
            LinqReadAll();
        }

private void LinqReadAll()
        {
            XElement xe = XElement.Load(@"..\..\channel.xml");
            IEnumerable<XElement> elements = from ele in xe.Elements("channel") select ele;
            showInfoByElements(elements);
        }

private void showInfoByElements(IEnumerable<XElement> elements)
        {
            foreach (var ele in elements)
            {
                ChannelConfig channelConfig = new ChannelConfig();
                channelConfig.X0 = Convert.ToDouble(ele.Element("x0").Value);
                channelConfig.Y0 = Convert.ToDouble(ele.Element("y0").Value);
                channelConfig.X1 = Convert.ToDouble(ele.Element("x1").Value);
                channelConfig.Y1 = Convert.ToDouble(ele.Element("y1").Value);
                channelConfig.Offset = Convert.ToDouble(ele.Element("offset").Value);
                channelConfig.ChannelName = ele.Attribute("Name").Value;

ChannelconfigList.Add(channelConfig);
             }

dgvChannelConfig.GridColor = Color.Blue;
            dgvChannelConfig.DataSource = ChannelconfigList;
       }

private void XmlDocumentReadAll()
        {
            XmlDocument xmlDoc = new XmlDocument();
            try
            {
                xmlDoc.Load(@"..\..\channel.xml");
            }
            catch (Exception ep)
            {
                MessageBox.Show(ep.ToString());
            }

//得到根节点channelconfig
            XmlNode xn = xmlDoc.SelectSingleNode("channelconfig");

//得到根节点的所有子节点
            XmlNodeList xnl = xn.ChildNodes;

foreach (XmlNode xn1 in xnl)
            {
                ChannelConfig channelConfig = new ChannelConfig();

// 将节点转换为元素，便于得到节点的属性值
                XmlElement xe = (XmlElement)xn1;

//得到Name属性的属性值
                channelConfig.ChannelName = xe.GetAttribute("Name").ToString();

// 得到channel节点的所有子节点
                XmlNodeList xnl0 = xe.ChildNodes;

channelConfig.X0 = Convert.ToDouble(xnl0.Item(0).InnerText);
                channelConfig.Y0 = Convert.ToDouble(xnl0.Item(1).InnerText);

channelConfig.X1 = Convert.ToDouble(xnl0.Item(2).InnerText);
                channelConfig.Y1 = Convert.ToDouble(xnl0.Item(3).InnerText);
                channelConfig.Offset = Convert.ToDouble(xnl0.Item(4).InnerText);

ChannelconfigList.Add(channelConfig);
            }

dgvChannelConfig.GridColor = Color.Blue;
            dgvChannelConfig.DataSource = ChannelconfigList;
        }

private void buttonSaveCurrent_Click(object sender, EventArgs e)
        {
            XElement xe = XElement.Load(@"..\..\channel.xml");
            if (dgvChannelConfig.CurrentRow != null)
            {
                //dgvChannelConfig.CurrentRow.Cells[0]对应着CHANNEL Name
                string id = dgvChannelConfig.CurrentRow.Cells[0].Value.ToString();
                IEnumerable<XElement> element = from ele in xe.Elements("channel")
                                         where ele.Attribute("Name").Value == id
                                         select ele;
                if (element.Count() > 0)
                {
                    XElement first = element.First();
                    //设置新的属性
                    first.SetAttributeValue("Name", dgvChannelConfig.CurrentRow.Cells[0].Value.ToString());

//替换新的节点
                    first.ReplaceNodes(
                        new XElement("x0", dgvChannelConfig.CurrentRow.Cells[1].Value.ToString()),
                        new XElement("y0", dgvChannelConfig.CurrentRow.Cells[2].Value.ToString()),
                        new XElement("x1", dgvChannelConfig.CurrentRow.Cells[3].Value.ToString()),
                        new XElement("y1", dgvChannelConfig.CurrentRow.Cells[4].Value.ToString()),
                        new XElement("offset", dgvChannelConfig.CurrentRow.Cells[5].Value.ToString())
                      );
                }

xe.Save(@"..\..\channel.xml");
                buttonReadAll_Click(sender, e);
            }
        }

}