.NET基础-22-委托|xml操作

委托：

 static void Main(string[] args)
        {

            ////直接调用方法
            //Console.WriteLine(Class2.Say("张三"));

            ////使用委托调用
            ////创建一个委托的对象,传入参数为方法Say
            //Class2.DelSay delt = new Class2.DelSay(Class2.Say);
            //Console.WriteLine(delt("李四"));
            ////也可以这么写,直接把方法Say装入委托对象
            ////使用委托指向的方法代替委托对象
            //Class2.DelSay delt2 = Class2.Say;
            //Console.WriteLine(delt2("王五"));

            ////或者直接调用Test
            ////这里传入的参数是一个委托,使用他指向的方法来作为参数传入
            //string result = Class2.GetSay("赵六", Class2.Say);
            //Console.WriteLine(result);

            //Console.ReadKey();



            string str = "aBdfReg";
            Console.WriteLine(Class1.ProStr(str, Class1.StrToLower));
            Console.WriteLine(Class1.ProStr(str, Class1.StrToupper));

            Class1.DelStr del1 = new Class1.DelStr(Class1.StrToupper);
            Console.WriteLine(del1(str));
            Class1.DelStr del2 = new Class1.DelStr(Class1.StrToLower);
            Console.WriteLine(del2(str));

            Console.ReadKey();
        }

Class2代码

public class Class2
    {

        /// <summary>
        /// 定义一个委托
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public delegate string DelSay(string name);



        /// <summary>
        /// 创建一个
        /// </summary>
        /// <param name="name"></param>
        /// <param name="del"></param>
        /// <returns></returns>
        public static string GetSay(string name, DelSay del)
        {
            return del(name);
        }



        /// <summary>
        /// 创建一个委托指向的方法
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public static string Say(string name)
        {
            return name + "说盈盈是个大美女";
        }
    }

Class1代码

public class Class1
    {

        /// <summary>
        /// 定义委托
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public delegate string DelStr(string str);



        /// <summary>
        /// 调用转换的方法
        /// </summary>
        /// <param name="str"></param>
        /// <param name="del"></param>
        /// <returns></returns>
        public static string ProStr(string str, DelStr del)
        {
            string result = null;
            char[] buffer = str.ToCharArray();
            for (int i = 0; i < buffer.Length; i++)
            {
                result += del(buffer[i].ToString());
            }


            return result;
        }



        /// <summary>
        /// 转换成大写
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string StrToupper(string str)
        {
            return str.ToUpper();
        }



        /// <summary>
        /// 转换成小写
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string StrToLower(string str)
        {
            return str.ToLower();
        }

    }

匿名函数

/// <summary>
        /// 匿名函数
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public delegate string DelNMHS(string str);

        static void Main(string[] args)
        {
            ////匿名函数
            //DelNMHS del = delegate(string str)
            //{
            //    return str + "是小猪佩奇";
            //};
            //Console.WriteLine(del("张三"));
            //Console.ReadKey();
            //或者使用lamda表达式书写
            DelNMHS del2 = (string str) => { return str + "回家吃奶去"; };
            Console.WriteLine(del2("李四"));
            Console.ReadKey();

        }

xml操作:

static void Main(string[] args)
        {
            CreateXml();

            CreateXmlItem();
        }


        /// <summary>
        /// 创建一个xml文档
        /// </summary>
        public static void CreateXml()
        {
            //创建一个xml对象
            XmlDocument xdoc = new XmlDocument();
            //创建xml文档版本号和编码类型
            XmlDeclaration dec = xdoc.CreateXmlDeclaration("1.0", "utf-8", null);
            //把版本和编码类型添加到xdoc中
            xdoc.AppendChild(dec);


            //创建根节点Books
            XmlElement books = xdoc.CreateElement("Books");
            xdoc.AppendChild(books);


            //为Books创建根节点的第一个子节点及其内容
            XmlElement book1 = xdoc.CreateElement("Book");
            books.AppendChild(book1);

            //为book1添加子节点及内容
            XmlElement name1 = xdoc.CreateElement("Name");
            name1.InnerXml = "战国策";
            book1.AppendChild(name1);
            XmlElement price1 = xdoc.CreateElement("Price");
            price1.InnerXml = "100";
            book1.AppendChild(price1);
            XmlElement des1 = xdoc.CreateElement("Des");
            des1.InnerXml = "历史书啊思密达";
            book1.AppendChild(des1);



            //为Books创建跟节点的第二个子节点及其内容
            XmlElement book2 = xdoc.CreateElement("Book");
            books.AppendChild(book2);

            //为book1添加子节点及内容
            XmlElement name2 = xdoc.CreateElement("Name");
            name2.InnerXml = "水浒传";
            book2.AppendChild(name2);
            XmlElement price2 = xdoc.CreateElement("Price");
            price2.InnerXml = "13";
            book2.AppendChild(price2);
            XmlElement des2 = xdoc.CreateElement("Des");
            des2.InnerXml = "喜欢武松";
            book2.AppendChild(des2);

            //保存
            xdoc.Save(@"C:\Users\Administrator\Desktop\test\1.xml");
        }


        /// <summary>
        /// 创建一个带属性的xml文件
        /// </summary>
        public static void CreateXmlItem()
        {
            //创建一个xml对象
            XmlDocument xdoc = new XmlDocument();
            //创建xml文档版本号和编码类型
            XmlDeclaration dec = xdoc.CreateXmlDeclaration("1.0", "utf-8", null);
            //把版本和编码类型添加到xdoc中
            xdoc.AppendChild(dec);


            //创建根节点
            XmlElement orders = xdoc.CreateElement("Orders");
            xdoc.AppendChild(orders);


            //创建根节点的第一个子节点及其内容
            XmlElement order1 = xdoc.CreateElement("Order");
            orders.AppendChild(order1);

            //为order1添加子节点及内容
            XmlElement name1 = xdoc.CreateElement("Name");
            name1.InnerXml = "丽丽";
            order1.AppendChild(name1);
            XmlElement number1 = xdoc.CreateElement("Number");
            number1.InnerXml = "BJ333338";
            order1.AppendChild(number1);

            //添加带属性的节点
            XmlElement items1 = xdoc.CreateElement("Items");
            order1.AppendChild(items1);

            XmlElement item11 = xdoc.CreateElement("Item");
            item11.SetAttribute("Name", "香水");
            item11.SetAttribute("Count", "3");
            item11.SetAttribute("Price", "120");
            item11.SetAttribute("TotPrice", (3 * 120).ToString ());
            items1.AppendChild(item11);
            XmlElement item12 = xdoc.CreateElement("Item");
            item12.SetAttribute("Name", "口红");
            item12.SetAttribute("Count", "30");
            item12.SetAttribute("Price", "240");
            item12.SetAttribute("TotPrice", (30 * 240).ToString());
            items1.AppendChild(item12);


            //创建跟节点的第二个子节点及其内容
            XmlElement order2 = xdoc.CreateElement("Order");
            orders.AppendChild(order2);

            //为order1添加子节点及内容
            XmlElement name2 = xdoc.CreateElement("Name");
            name2.InnerXml = "硕硕";
            order2.AppendChild(name2);
            XmlElement number2 = xdoc.CreateElement("Number");
            number2.InnerXml = "BJ333339";
            order2.AppendChild(number2);

            //添加带属性的节点
            XmlElement items2 = xdoc.CreateElement("Items");
            order2.AppendChild(items2);

            XmlElement item21 = xdoc.CreateElement("Item");
            item21.SetAttribute("Name", "香水");
            item21.SetAttribute("Count", "3");
            item21.SetAttribute("Price", "120");
            item21.SetAttribute("TotPrice", (3 * 120).ToString());
            items2.AppendChild(item21);
            XmlElement item22 = xdoc.CreateElement("Item");
            item22.SetAttribute("Name", "口红");
            item22.SetAttribute("Count", "30");
            item22.SetAttribute("Price", "240");
            item22.SetAttribute("TotPrice", (30 * 240).ToString());
            items2.AppendChild(item22);

            //保存
            xdoc.Save(@"C:\Users\Administrator\Desktop\test\2.xml");
        }