C# XML文件（相机参数保存和读取）

1. XML基础

XML是可扩展标记语言（Extensible Markup Language,XML)是一种数据语言，它将数据以一种简单的文本格式存储，可以被人类和几乎任何计算机理解。Microsoft在.Net Framework和其他微软产品中已经完全采用它。
XML的基本格式：

<book>
    <title>Beginning Visual C# 7title>
    <author>Benjamin Perkins et alauthor>
    <code>458685code>
book>

2. XML基本操作

C#操作XML方法详解

3. 相机参数保存和读取

• 创建一个相机参数XML文件保存和读取的类CameraXML

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace xmlTest
{
    class Camera
    {
        public string camID;
        public int camExposure;
        public int camGain;

        public Camera()
        {
            camID = "nullID";
            camExposure = 5000;
            camGain = 0;
        }

        public Camera(string camID, int camExposure, int camGain)
        {
            this.camID = camID;
            this.camExposure = camExposure;
            this.camGain = camGain;
        }
    }

    class CameraXML
    {
        /// 

        /// 创建相机XML文件
        /// 
        /// 存储路径
        /// 相机列表
        public static void GenerateCameraXMLFile(string xmlFilePath, List<Camera> cameraList)
        {
            try
            {
                //初始化一个xml实例
                XmlDocument myXmlDoc = new XmlDocument();
                //创建xml的根节点
                XmlElement rootElement = myXmlDoc.CreateElement("Cameras");
                //将根节点加入到xml文件中（AppendChild）
                myXmlDoc.AppendChild(rootElement);

                foreach (var item in cameraList)
                {
                    //初始化第一层的第一个子节点
                    XmlElement firstLevelElement1 = myXmlDoc.CreateElement("Camera");
                    //填充第一层的第一个子节点的属性值（SetAttribute）
                    firstLevelElement1.SetAttribute("ID", item.camID);
                    //将第一层的第一个子节点加入到根节点下
                    rootElement.AppendChild(firstLevelElement1);
                    //初始化第二层的第一个子节点
                    XmlElement secondLevelElement11 = myXmlDoc.CreateElement("Exposure");
                    //填充第二层的第一个子节点的值（InnerText）
                    secondLevelElement11.InnerText = item.camExposure.ToString();
                    firstLevelElement1.AppendChild(secondLevelElement11);
                    XmlElement secondLevelElement12 = myXmlDoc.CreateElement("Gain");
                    secondLevelElement12.InnerText = item.camGain.ToString();
                    firstLevelElement1.AppendChild(secondLevelElement12);

                }
                //将xml文件保存到指定的路径下
                myXmlDoc.Save(xmlFilePath);

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

        public static void ReadCameraXMLFile(string xmlFilePath, out List<Camera> cameraList)
        {
            cameraList = new List<Camera>();

            //初始化一个xml实例
            XmlDocument myXmlDoc = new XmlDocument();
            //加载xml文件（参数为xml文件的路径）
            myXmlDoc.Load(xmlFilePath);
            //获得第一个匹配的节点（SelectSingleNode）：此xml文件的根节点
            XmlNode rootNode = myXmlDoc.SelectSingleNode("Cameras");
            //分别获得该节点的InnerXml和OuterXml信息
            string innerXmlInfo = rootNode.InnerXml.ToString();
            string outerXmlInfo = rootNode.OuterXml.ToString();
            //获得该节点的子节点（即：该节点的第一层子节点）
            XmlNodeList firstLevelNodeList = rootNode.ChildNodes;

            try
            {
                foreach (XmlNode node in firstLevelNodeList)
                {
                    Camera camera = new Camera();
                    //获得该节点的属性集合
                    XmlAttributeCollection attributeCol = node.Attributes;
                    foreach (XmlAttribute attri in attributeCol)
                    {
                        //获取属性名称与属性值
                        string name = attri.Name;
                        string value = attri.Value;
                        camera.camID = value;//相机ID
                    }

                    //判断此节点是否还有子节点
                    if (node.HasChildNodes)
                    {
                        //获取该节点的第一个子节点
                        XmlNode secondLevelNode1 = node.FirstChild;
                        //获取该节点的名字
                        string name = secondLevelNode1.Name;
                        //获取该节点的值（即：InnerText）
                        string innerText = secondLevelNode1.InnerText;
                        camera.camExposure = Convert.ToInt16(innerText);//相机曝光

                        //获取该节点的第二个子节点（用数组下标获取）
                        XmlNode secondLevelNode2 = node.ChildNodes[1];
                        name = secondLevelNode2.Name;
                        innerText = secondLevelNode2.InnerText;
                        camera.camGain = Convert.ToInt16(innerText);//相机增益
                    }

                    cameraList.Add(camera);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
        }

    }
}

• 在winform中使用这个类

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;//引入命名空间

namespace xmlTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void buttonGenerateCameraXMLFile_Click(object sender, EventArgs e)
        {
            List<Camera> cameraList = new List<Camera>();
            Camera camera;
            camera = new Camera("L102314123", 4500, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314124", 5500, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314125", 3500, 1);
            cameraList.Add(camera);
            camera = new Camera("L102314126", 6500, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314127", 4880, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314128", 9500, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314129", 4530, 0);
            cameraList.Add(camera);
            camera = new Camera("L102314130", 13200, 0);
            cameraList.Add(camera);

            CameraXML.GenerateCameraXMLFile("D:\\Cameras.xml", cameraList);
        }

        private void buttonReadCameraXMLFile_Click(object sender, EventArgs e)
        {
            List<Camera> cameraList = new List<Camera>();
            CameraXML.ReadCameraXMLFile("D:\\Cameras.xml", out cameraList);

            foreach (var item in cameraList)
            {
                listBox1.Items.Add("ID:" + item.camID);
                listBox1.Items.Add("Exposure:" + item.camExposure);
                listBox1.Items.Add("Gain:" + item.camGain);
            }
        }
    }
}