<?xml version="1.0" encoding="UTF-8"?>

<students>

    <student position="班长">

        <name>张三</name>

        <age>15</age>

        <sex>男</sex>

    </student>

    <student position="学习委员">

        <name>李四</name>

        <age>14</age>

        <sex>女</sex>

    </student>

    <student>

        <name>王五</name>

        <age>16</age>

        <sex>男</sex>

    </student>

</students>

 [TestMethod]

        public void TestXml()

        {

            XmlDocument xml = new XmlDocument();//XML对象

            try

            {

                xml.Load("student.xml");//读取XML文件

                XmlNode students = xml.ChildNodes[];//找第二个xml节点

                XmlNodeList listnodes= students.SelectNodes("student");//找students下所有符合的节点

                XmlNode student = students.SelectSingleNode("student");//找students下第一个符合的节点

                XmlAttribute xmla = student.Attributes[];//找属性

                string xmlastring = xmla.Value;//属性值

                Console.WriteLine(xmlastring);//取出第一个学生的属性值

                var sex1 = listnodes[].SelectSingleNode("sex").InnerText;//取出第二个学生的性别

                Console.WriteLine(sex1);

            }

            catch (Exception ex)

            {

                Console.WriteLine("加载失败：加载路径或格式不正确");

            }

        }

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <appSettings>

    <add key="张三" value="603班"/>

    <add key="李四" value="601班"/>

  </appSettings>

  <connectionStrings>

    <add name="dbtest" connectionString="Data Source=.;Initial Catalog=EMQ_MANAGE;User ID=sa password=zkx123"/>

    <add name="students" connectionString="Data Source=192.168.1.111;Initial Catalog=orcl;User ID=sa password=zkx123"/>

</connectionStrings>

</configuration>

[TestMethod]

        public void testConfig()

        {

            string value = ConfigurationManager.AppSettings["张三"];//获取appseting节点的值

            string value1 = ConfigurationManager.AppSettings[];

            string value2 = ConfigurationManager.ConnectionStrings["dbtest"].ToString();//获取数据库连接字符串

            string value3 = ConfigurationManager.ConnectionStrings["students"].ToString();//获取数据库连接字符串

            ConfigXmlDocument cxd = new ConfigXmlDocument();//和XmlDocument一样的用法只不过一个是读xml一个是读config

            cxd.Load("../../App.config");

            var value4 = cxd.ChildNodes[].SelectSingleNode("connectionStrings").SelectNodes("add")[].Attributes["name"].Value;

            var value5 = cxd.ChildNodes[].SelectSingleNode("connectionStrings").SelectNodes("add")[].Attributes["connectionString"].Value;

            Console.WriteLine(value);//获取appseting节点名字叫张三的值

            Console.WriteLine(value1);//获取第二个节点的值

            Console.WriteLine(value2);//获取["dbtest"]数据库连接

            Console.WriteLine(value3);//获取第二个节点的数据库连接字符串

            Console.WriteLine(value4);//用XML的方式获取第一个节点的name值

            Console.WriteLine(value5);//用XML的方式获取第一个节点的connectionString值

        }

[TestMethod]

        public void TestTxt()

        {

            StreamWriter sw = new StreamWriter("message.txt",true, Encoding.UTF8);//创建写流

            sw.WriteLine("");//空表示直接换行

            sw.WriteLine("你好");//写入内容

            sw.WriteLine("我是新来的甲六");//写入内容

            sw.Close();

            FileStream fs = new FileStream("message.txt", FileMode.Open);//创建文件流

            StreamReader sr = new StreamReader(fs, Encoding.UTF8);//创建读流

            // sr.CurrentEncoding = Encoding.UTF8;

            var textvalue = sr.ReadToEnd();//从头读到尾

            sr.Close();

            fs.Close();

            Console.WriteLine(textvalue);

        }