第五章基元数据,引用类型和值类型笔记

了解一下BinaryReader 和BinaryWirte基元类型：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace ConsoleApp
{
    class Program
    {
        private const string FileName = "AppSetting.txt";
        static void Main(string[] args)
        {
            WriteDefaultValues();
            DisplyValues();
        }

        /// <summary>
        /// 按顺序写入
        /// </summary>
        public static void WriteDefaultValues()
        {

            using (BinaryWriter writer = new BinaryWriter(File.Open(FileName, FileMode.Create)))
            {
                writer.Write(1.250F);
                writer.Write(@"C:\Temp");
                writer.Write(10);
                writer.Write(true);
            }
        }
        /// <summary>
        /// 按顺序写入值进行读取
        /// </summary>
        public static void DisplyValues()
        {
            float aspectRatio;
            string tempDirectory;
            int autoSaveTime;
            bool showStatusBar;
            if (File.Exists(FileName))
            {

                using (BinaryReader reader = new BinaryReader(File.Open(FileName, FileMode.Open)))
                {
                    aspectRatio = reader.ReadSingle();
                    tempDirectory = reader.ReadString();
                    autoSaveTime = reader.ReadInt32();
                    showStatusBar = reader.ReadBoolean();
                }
                Console.WriteLine("float类型值: " + aspectRatio);
                Console.WriteLine("字符串类型值: " + tempDirectory);
                Console.WriteLine("int值: " + autoSaveTime);
                Console.WriteLine("布尔值: " + showStatusBar);
            }
        }
    }
}

　　任何称为"类"的类型都是引用类型。所有值类型都称为结构或枚举

　　结构都是抽象类型：System.ValueType的直接派生类；

　　枚举都是System.Enum抽象对象派生的；后者又从System.ValueType.